Patent
US 10,038,182GRAPHENE COATING MODIFIED ELECTRODE PLATE FOR LITHIUM SECONDARY BATTERY AND METHOD FOR PRODUCING THE SAME
Zhaoping Liu
US
Copyright © 2026 Matter42. All rights reserved.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene la y ers modified LiFePO 4 positive electrode plate, which is obtained from the following method: (1) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 3 microns (referred to as the inner graphene la y er); (2) 90 parts by weight of LiFeP O 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene la y ers, and the coated foil was dried in an oven at 80 C to obtain an electrode plate comprising positive material la y ers, the thickness of the positive material la y er on a single side was microns; (3) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 4 microns (referred to as the outer graphene la y er). Currently amended
2-8. Canceled
Canceled
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating both surfaces of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to both surfaces of the foil, and drying the coated foil in an oven at 50 ° C to 200 ° C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 0 C to 200 °C Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 9, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer. Withdrawn
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, graphene layers coated on the surface of the current collector foil, and electrode active material layers coated on the graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers are coated on one or both surfaces of the current collector foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers and the electrode active material layers are alternately coated on the current collector foil, and the alternating layers include a total number of 1-20 layers. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the outermost layer of the electrode plate is coated with a graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, each of the graphene layers has a thickness of 10 nanometers to 100 microns, each of the electrode active material layers has a thickness of 10 microns to 300 microns, and the current collector foil is copper foil or aluminum foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer includes a regular and continuous coating, a mesh coating, an irregular non-continuous coating, or an irregular continuous coating. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer can be applied by spraying, printing, spin coating or smearing. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the electrode active material layers contain 80 to 98 parts by mass of an electrode active material, 1 to 10 parts of a conductive additive, and 1 to 10 parts of a binder. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers contain a graphene-containing conductive material and a binder at a mass ratio of from 4: 1 to 99:1, wherein the graphene-containing conductive material includes graphene; the graphene-containing conductive material further includes the combination of at least more than 5 % by mass of graphene and one or more selected from the group consisting of graphite, expandable graphite, carbon nanotubes, carbon fibers, activated carbon, amorphous carbon, conductive carbon black, acetylene black, Super-Li, and KS-6; the graphene layer is a laminar carbon material comprising a single layer or 1 to sublayers, the structure inside the sublayers being hexagonal honeycomb lattices formed by sp2 hybrid orbitals of carbon atoms, and the structure between the sublayers being formed of carbon atoms bound by t bond; or the graphene layer is a graphene material containing one or more of fluorine, nitrogen, oxygen, carbonyl, carboxyl, and hydroxyl and/or intercalated graphene; and the binder includes one or more selected from the group consisting of polyvinylidene fluoride, CMC, SBR, and LA series binders. Withdrawn
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating surface of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to a surface of the foil, and drying the coated foil in an oven at 50° C to 200 °C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 ° C to 200 °C. Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 23, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer and an electrode active material layer. Withdrawn
25-28. Canceled
Canceled
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified Li Mn₂₀ 4 positive electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of LiMn 2 0 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene layers, and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising positive material layers, the thickness of the positive material layer on a single side was microns; (3) 98 parts by weight of graphene, 2 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 4 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 99 parts by weight of graphene, 25 parts by weight of PVDF and 5000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 80 parts by weight of graphite, 8 parts by weight of CMC, 7 parts by weight of KS-6 and 500 parts by weight of water were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising negative material layers, the thickness of the negative material layer on a single side was microns; (3) 70 parts by weight of graphene, 20 parts by weight of PVDF and 3000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the electrode plate comprising negative material layers obtained in step (2), and the coated foil was dried in an oven at 1 50° C to obtain an electrode plate modified with graphene layers, the thickness of the graphene layer on a single side was 3 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of graphite, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C material layers, the thickness of the negative 98 parts by weight of graphene, 2 parts by weight were sufficiently mixed and dissolved to obtain a the electrode plate comprising negative material was dried in an oven at 1 50° C to obtain an electrode thickness of the graphene layer on a single side layer). New to obtain an electrode plate comprising negative material layer on a single side was 90 microns; (3) of PVDF and 2000 parts by weight of NMP slurry, the slurry was applied to both surfaces of layers obtained in step (2), and the coated foil plate modified with graphene layers, the was 4 microns (referred to as the outer graphene
Layer stacks claimed or described, ordered top of device to substrate.
graphene coating-modified LiFePO₄ positive electrode plate
graphene coating-modified electrode plate (generic)
graphene coating-modified LiMn₂O₄ positive electrode plate
graphene coating-modified graphite negative electrode plate (claim 30)
graphene coating-modified graphite negative electrode plate (claim 31)
Materials described outside the worked examples.
graphene
LiFePO₄
PVDF
NMP
SP (Super-P carbon black)
aluminum foil
copper foil
lithium manganese phosphate
lithium vanadium phosphate
lithium iron silicate
lithium cobaltate
nickel-cobalt-manganese ternary material
spinel lithium nickel manganese oxide
lithium manganate (LiMn₂O₄)
LiMn₂O₄
lithium-rich layered lithium nickel manganese oxide
natural graphite
mesophase carbon microspheres
lithium titanate
silicon based alloys
tin based alloys
graphite (artificial/natural, negative electrode)
CMC
KS-6
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 0.1–20 µm | — |
Thickness | 10–600 µm | — |
Thickness | 10–300 µm | — |
Pressure | 70–99 pa | — |
Pressure | 1–30 pa | — |
Pressure | 80–98 pa | — |
Pressure | 1–10 pa | — |
Pressure | 50–500 pa | — |
Temperature | 50–200 °C | — |
Thickness | 10–100000 nm | — |
Voltage | ≤ 2 V | — |
Thickness | 1–1011 µm | — |
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GRAPHENE BASED CORROSION-RESISTANT COATING
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GRAPHENE BASED ANTI-CORROSION COATINGS
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Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene la y ers modified LiFePO 4 positive electrode plate, which is obtained from the following method: (1) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 3 microns (referred to as the inner graphene la y er); (2) 90 parts by weight of LiFeP O 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene la y ers, and the coated foil was dried in an oven at 80 C to obtain an electrode plate comprising positive material la y ers, the thickness of the positive material la y er on a single side was microns; (3) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 4 microns (referred to as the outer graphene la y er). Currently amended
2-8. Canceled
Canceled
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating both surfaces of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to both surfaces of the foil, and drying the coated foil in an oven at 50 ° C to 200 ° C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 0 C to 200 °C Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 9, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer. Withdrawn
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, graphene layers coated on the surface of the current collector foil, and electrode active material layers coated on the graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers are coated on one or both surfaces of the current collector foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers and the electrode active material layers are alternately coated on the current collector foil, and the alternating layers include a total number of 1-20 layers. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the outermost layer of the electrode plate is coated with a graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, each of the graphene layers has a thickness of 10 nanometers to 100 microns, each of the electrode active material layers has a thickness of 10 microns to 300 microns, and the current collector foil is copper foil or aluminum foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer includes a regular and continuous coating, a mesh coating, an irregular non-continuous coating, or an irregular continuous coating. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer can be applied by spraying, printing, spin coating or smearing. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the electrode active material layers contain 80 to 98 parts by mass of an electrode active material, 1 to 10 parts of a conductive additive, and 1 to 10 parts of a binder. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers contain a graphene-containing conductive material and a binder at a mass ratio of from 4: 1 to 99:1, wherein the graphene-containing conductive material includes graphene; the graphene-containing conductive material further includes the combination of at least more than 5 % by mass of graphene and one or more selected from the group consisting of graphite, expandable graphite, carbon nanotubes, carbon fibers, activated carbon, amorphous carbon, conductive carbon black, acetylene black, Super-Li, and KS-6; the graphene layer is a laminar carbon material comprising a single layer or 1 to sublayers, the structure inside the sublayers being hexagonal honeycomb lattices formed by sp2 hybrid orbitals of carbon atoms, and the structure between the sublayers being formed of carbon atoms bound by t bond; or the graphene layer is a graphene material containing one or more of fluorine, nitrogen, oxygen, carbonyl, carboxyl, and hydroxyl and/or intercalated graphene; and the binder includes one or more selected from the group consisting of polyvinylidene fluoride, CMC, SBR, and LA series binders. Withdrawn
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating surface of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to a surface of the foil, and drying the coated foil in an oven at 50° C to 200 °C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 ° C to 200 °C. Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 23, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer and an electrode active material layer. Withdrawn
25-28. Canceled
Canceled
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified Li Mn₂₀ 4 positive electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of LiMn 2 0 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene layers, and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising positive material layers, the thickness of the positive material layer on a single side was microns; (3) 98 parts by weight of graphene, 2 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 4 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 99 parts by weight of graphene, 25 parts by weight of PVDF and 5000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 80 parts by weight of graphite, 8 parts by weight of CMC, 7 parts by weight of KS-6 and 500 parts by weight of water were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising negative material layers, the thickness of the negative material layer on a single side was microns; (3) 70 parts by weight of graphene, 20 parts by weight of PVDF and 3000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the electrode plate comprising negative material layers obtained in step (2), and the coated foil was dried in an oven at 1 50° C to obtain an electrode plate modified with graphene layers, the thickness of the graphene layer on a single side was 3 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of graphite, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C material layers, the thickness of the negative 98 parts by weight of graphene, 2 parts by weight were sufficiently mixed and dissolved to obtain a the electrode plate comprising negative material was dried in an oven at 1 50° C to obtain an electrode thickness of the graphene layer on a single side layer). New to obtain an electrode plate comprising negative material layer on a single side was 90 microns; (3) of PVDF and 2000 parts by weight of NMP slurry, the slurry was applied to both surfaces of layers obtained in step (2), and the coated foil plate modified with graphene layers, the was 4 microns (referred to as the outer graphene
Layer stacks claimed or described, ordered top of device to substrate.
graphene coating-modified LiFePO₄ positive electrode plate
graphene coating-modified electrode plate (generic)
graphene coating-modified LiMn₂O₄ positive electrode plate
graphene coating-modified graphite negative electrode plate (claim 30)
graphene coating-modified graphite negative electrode plate (claim 31)
Materials described outside the worked examples.
graphene
LiFePO₄
PVDF
NMP
SP (Super-P carbon black)
aluminum foil
copper foil
lithium manganese phosphate
lithium vanadium phosphate
lithium iron silicate
lithium cobaltate
nickel-cobalt-manganese ternary material
spinel lithium nickel manganese oxide
lithium manganate (LiMn₂O₄)
LiMn₂O₄
lithium-rich layered lithium nickel manganese oxide
natural graphite
mesophase carbon microspheres
lithium titanate
silicon based alloys
tin based alloys
graphite (artificial/natural, negative electrode)
CMC
KS-6
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 0.1–20 µm | — |
Thickness | 10–600 µm | — |
Thickness | 10–300 µm | — |
Pressure | 70–99 pa | — |
Pressure | 1–30 pa | — |
Pressure | 80–98 pa | — |
Pressure | 1–10 pa | — |
Pressure | 50–500 pa | — |
Temperature | 50–200 °C | — |
Thickness | 10–100000 nm | — |
Voltage | ≤ 2 V | — |
Thickness | 1–1011 µm | — |
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GRAPHENE BASED CORROSION-RESISTANT COATING
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Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene la y ers modified LiFePO 4 positive electrode plate, which is obtained from the following method: (1) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 3 microns (referred to as the inner graphene la y er); (2) 90 parts by weight of LiFeP O 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene la y ers, and the coated foil was dried in an oven at 80 C to obtain an electrode plate comprising positive material la y ers, the thickness of the positive material la y er on a single side was microns; (3) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 4 microns (referred to as the outer graphene la y er). Currently amended
2-8. Canceled
Canceled
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating both surfaces of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to both surfaces of the foil, and drying the coated foil in an oven at 50 ° C to 200 ° C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 0 C to 200 °C Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 9, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer. Withdrawn
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, graphene layers coated on the surface of the current collector foil, and electrode active material layers coated on the graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers are coated on one or both surfaces of the current collector foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers and the electrode active material layers are alternately coated on the current collector foil, and the alternating layers include a total number of 1-20 layers. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the outermost layer of the electrode plate is coated with a graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, each of the graphene layers has a thickness of 10 nanometers to 100 microns, each of the electrode active material layers has a thickness of 10 microns to 300 microns, and the current collector foil is copper foil or aluminum foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer includes a regular and continuous coating, a mesh coating, an irregular non-continuous coating, or an irregular continuous coating. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer can be applied by spraying, printing, spin coating or smearing. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the electrode active material layers contain 80 to 98 parts by mass of an electrode active material, 1 to 10 parts of a conductive additive, and 1 to 10 parts of a binder. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers contain a graphene-containing conductive material and a binder at a mass ratio of from 4: 1 to 99:1, wherein the graphene-containing conductive material includes graphene; the graphene-containing conductive material further includes the combination of at least more than 5 % by mass of graphene and one or more selected from the group consisting of graphite, expandable graphite, carbon nanotubes, carbon fibers, activated carbon, amorphous carbon, conductive carbon black, acetylene black, Super-Li, and KS-6; the graphene layer is a laminar carbon material comprising a single layer or 1 to sublayers, the structure inside the sublayers being hexagonal honeycomb lattices formed by sp2 hybrid orbitals of carbon atoms, and the structure between the sublayers being formed of carbon atoms bound by t bond; or the graphene layer is a graphene material containing one or more of fluorine, nitrogen, oxygen, carbonyl, carboxyl, and hydroxyl and/or intercalated graphene; and the binder includes one or more selected from the group consisting of polyvinylidene fluoride, CMC, SBR, and LA series binders. Withdrawn
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating surface of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to a surface of the foil, and drying the coated foil in an oven at 50° C to 200 °C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 ° C to 200 °C. Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 23, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer and an electrode active material layer. Withdrawn
25-28. Canceled
Canceled
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified Li Mn₂₀ 4 positive electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of LiMn 2 0 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene layers, and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising positive material layers, the thickness of the positive material layer on a single side was microns; (3) 98 parts by weight of graphene, 2 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 4 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 99 parts by weight of graphene, 25 parts by weight of PVDF and 5000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 80 parts by weight of graphite, 8 parts by weight of CMC, 7 parts by weight of KS-6 and 500 parts by weight of water were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising negative material layers, the thickness of the negative material layer on a single side was microns; (3) 70 parts by weight of graphene, 20 parts by weight of PVDF and 3000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the electrode plate comprising negative material layers obtained in step (2), and the coated foil was dried in an oven at 1 50° C to obtain an electrode plate modified with graphene layers, the thickness of the graphene layer on a single side was 3 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of graphite, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C material layers, the thickness of the negative 98 parts by weight of graphene, 2 parts by weight were sufficiently mixed and dissolved to obtain a the electrode plate comprising negative material was dried in an oven at 1 50° C to obtain an electrode thickness of the graphene layer on a single side layer). New to obtain an electrode plate comprising negative material layer on a single side was 90 microns; (3) of PVDF and 2000 parts by weight of NMP slurry, the slurry was applied to both surfaces of layers obtained in step (2), and the coated foil plate modified with graphene layers, the was 4 microns (referred to as the outer graphene
Layer stacks claimed or described, ordered top of device to substrate.
graphene coating-modified LiFePO₄ positive electrode plate
graphene coating-modified electrode plate (generic)
graphene coating-modified LiMn₂O₄ positive electrode plate
graphene coating-modified graphite negative electrode plate (claim 30)
graphene coating-modified graphite negative electrode plate (claim 31)
Materials described outside the worked examples.
graphene
LiFePO₄
PVDF
NMP
SP (Super-P carbon black)
aluminum foil
copper foil
lithium manganese phosphate
lithium vanadium phosphate
lithium iron silicate
lithium cobaltate
nickel-cobalt-manganese ternary material
spinel lithium nickel manganese oxide
lithium manganate (LiMn₂O₄)
LiMn₂O₄
lithium-rich layered lithium nickel manganese oxide
natural graphite
mesophase carbon microspheres
lithium titanate
silicon based alloys
tin based alloys
graphite (artificial/natural, negative electrode)
CMC
KS-6
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 0.1–20 µm | — |
Thickness | 10–600 µm | — |
Thickness | 10–300 µm | — |
Pressure | 70–99 pa | — |
Pressure | 1–30 pa | — |
Pressure | 80–98 pa | — |
Pressure | 1–10 pa | — |
Pressure | 50–500 pa | — |
Temperature | 50–200 °C | — |
Thickness | 10–100000 nm | — |
Voltage | ≤ 2 V | — |
Thickness | 1–1011 µm | — |
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Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene la y ers modified LiFePO 4 positive electrode plate, which is obtained from the following method: (1) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 3 microns (referred to as the inner graphene la y er); (2) 90 parts by weight of LiFeP O 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene la y ers, and the coated foil was dried in an oven at 80 C to obtain an electrode plate comprising positive material la y ers, the thickness of the positive material la y er on a single side was microns; (3) 98 parts by weight of graphene, 3 parts by weight of PVDF and 2500 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 C to obtain an aluminum foil modified with graphene la y ers, the thickness of the graphene la y er on a single side was 4 microns (referred to as the outer graphene la y er). Currently amended
2-8. Canceled
Canceled
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating both surfaces of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to both surfaces of the foil, and drying the coated foil in an oven at 50 ° C to 200 ° C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 0 C to 200 °C Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 9, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer. Withdrawn
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, graphene layers coated on the surface of the current collector foil, and electrode active material layers coated on the graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers are coated on one or both surfaces of the current collector foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers and the electrode active material layers are alternately coated on the current collector foil, and the alternating layers include a total number of 1-20 layers. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the outermost layer of the electrode plate is coated with a graphene layer. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, each of the graphene layers has a thickness of 10 nanometers to 100 microns, each of the electrode active material layers has a thickness of 10 microns to 300 microns, and the current collector foil is copper foil or aluminum foil. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer includes a regular and continuous coating, a mesh coating, an irregular non-continuous coating, or an irregular continuous coating. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layer can be applied by spraying, printing, spin coating or smearing. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the electrode active material layers contain 80 to 98 parts by mass of an electrode active material, 1 to 10 parts of a conductive additive, and 1 to 10 parts of a binder. Withdrawn
The graphene coating-modified electrode plate for lithium secondary battery according to claim 11, characterized in that, the graphene layers contain a graphene-containing conductive material and a binder at a mass ratio of from 4: 1 to 99:1, wherein the graphene-containing conductive material includes graphene; the graphene-containing conductive material further includes the combination of at least more than 5 % by mass of graphene and one or more selected from the group consisting of graphite, expandable graphite, carbon nanotubes, carbon fibers, activated carbon, amorphous carbon, conductive carbon black, acetylene black, Super-Li, and KS-6; the graphene layer is a laminar carbon material comprising a single layer or 1 to sublayers, the structure inside the sublayers being hexagonal honeycomb lattices formed by sp2 hybrid orbitals of carbon atoms, and the structure between the sublayers being formed of carbon atoms bound by t bond; or the graphene layer is a graphene material containing one or more of fluorine, nitrogen, oxygen, carbonyl, carboxyl, and hydroxyl and/or intercalated graphene; and the binder includes one or more selected from the group consisting of polyvinylidene fluoride, CMC, SBR, and LA series binders. Withdrawn
A method for producing a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the method includes the following steps: 1) preparing a current collector foil; 2) coating surface of the current collector foil with a graphene layer according to a coating process comprising sufficiently mixing and dissolving 70 to 99 parts by weight of graphene and 1 to 30 parts by weight of a binder in 100 parts to 5,000 parts by weight of a solvent to obtain a slurry, applying the slurry to a surface of the foil, and drying the coated foil in an oven at 50° C to 200 °C; and 3) coating the graphene layer with an electrode active material layer prepared by sufficiently mixing and dissolving 80 to 98 parts by weight of an electrode active material, 1 to 10 parts by weight of a conductive additive and 1 to 10 parts by weight of a binder in 50 to 500 parts by weight of a solvent to obtain a slurry, applying the slurry to the graphene layer, and drying the coated product in an oven at 50 ° C to 200 °C. Withdrawn
The method for producing a graphene coating-modified electrode plate for lithium secondary battery according to claim 23, characterized in that, the method further includes a step of further coating the electrode active material layer with a graphene layer and an electrode active material layer. Withdrawn
25-28. Canceled
Canceled
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified Li Mn₂₀ 4 positive electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of LiMn 2 0 4, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil modified with graphene layers, and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising positive material layers, the thickness of the positive material layer on a single side was microns; (3) 98 parts by weight of graphene, 2 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the aluminum foil, and the coated foil was dried in an oven at 80 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 4 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 99 parts by weight of graphene, 25 parts by weight of PVDF and 5000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 80 parts by weight of graphite, 8 parts by weight of CMC, 7 parts by weight of KS-6 and 500 parts by weight of water were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C to obtain an electrode plate comprising negative material layers, the thickness of the negative material layer on a single side was microns; (3) 70 parts by weight of graphene, 20 parts by weight of PVDF and 3000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the electrode plate comprising negative material layers obtained in step (2), and the coated foil was dried in an oven at 1 50° C to obtain an electrode plate modified with graphene layers, the thickness of the graphene layer on a single side was 3 microns (referred to as the outer graphene layer). New
A graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers; the electrode active material layer is further coated with an outer graphene layer; wherein the graphene coating-modified electrode plate is graphene layers modified graphite negative electrode plate, which is obtained from the following method: (1) 97 parts by weight of graphene, 3 parts by weight of PVDF and 2000 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of an aluminum foil, and the coated foil was dried in an oven at 50 ° C to obtain an aluminum foil modified with graphene layers, the thickness of the graphene layer on a single side was 2 microns (referred to as the inner graphene layer); (2) 90 parts by weight of graphite, 5 parts by weight of PVDF, 5 parts by weight of SP and 200 parts by weight of NMP were sufficiently mixed and dissolved to obtain a slurry, the slurry was applied to both surfaces of the copper foil modified with graphene layers obtained in step (1), and the coated foil was dried in an oven at 80 ° C material layers, the thickness of the negative 98 parts by weight of graphene, 2 parts by weight were sufficiently mixed and dissolved to obtain a the electrode plate comprising negative material was dried in an oven at 1 50° C to obtain an electrode thickness of the graphene layer on a single side layer). New to obtain an electrode plate comprising negative material layer on a single side was 90 microns; (3) of PVDF and 2000 parts by weight of NMP slurry, the slurry was applied to both surfaces of layers obtained in step (2), and the coated foil plate modified with graphene layers, the was 4 microns (referred to as the outer graphene
Layer stacks claimed or described, ordered top of device to substrate.
graphene coating-modified LiFePO₄ positive electrode plate
graphene coating-modified electrode plate (generic)
graphene coating-modified LiMn₂O₄ positive electrode plate
graphene coating-modified graphite negative electrode plate (claim 30)
graphene coating-modified graphite negative electrode plate (claim 31)
Materials described outside the worked examples.
graphene
LiFePO₄
PVDF
NMP
SP (Super-P carbon black)
aluminum foil
copper foil
lithium manganese phosphate
lithium vanadium phosphate
lithium iron silicate
lithium cobaltate
nickel-cobalt-manganese ternary material
spinel lithium nickel manganese oxide
lithium manganate (LiMn₂O₄)
LiMn₂O₄
lithium-rich layered lithium nickel manganese oxide
natural graphite
mesophase carbon microspheres
lithium titanate
silicon based alloys
tin based alloys
graphite (artificial/natural, negative electrode)
CMC
KS-6
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 0.1–20 µm | — |
Thickness | 10–600 µm | — |
Thickness | 10–300 µm | — |
Pressure | 70–99 pa | — |
Pressure | 1–30 pa | — |
Pressure | 80–98 pa | — |
Pressure | 1–10 pa | — |
Pressure | 50–500 pa | — |
Temperature | 50–200 °C | — |
Thickness | 10–100000 nm | — |
Voltage | ≤ 2 V | — |
Thickness | 1–1011 µm | — |
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