METHOD FOR MANUFACTURING STORAGE BATTERY ELECTRODE, STORAGE BATTERY ELECTRODE, STORAGE BATTERY, AND ELECTRONIC DEVICE

• US 20130337320A1
• Filed: 06/10/2013
• Published: 12/19/2013
• Est. Priority Date: 06/15/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: YUKAWA, Mikio
• Granted Patent: US 9,225,003 B2
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0416 involving impregnation with a solution, dispersion, paste or dry powder H01M4/0438 takes precedence
• CPC Class Codes: H01M 4/043 involving compressing or compaction
• CPC Class Codes: H01M 4/0435 Rolling or calendering
• CPC Class Codes: H01M 4/0471 involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
• CPC Class Codes: H01M 4/049 Manufacturing of an active layer by chemical means
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/1397 of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/5805 Phosphides
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 4/64 Carriers or collectors
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

To provide a method for forming a storage battery electrode including an active material layer with high density in which the proportion of conductive additive is low and the proportion of the active material is high. To provide a storage battery having a higher capacity per unit volume of an electrode with the use of a storage battery electrode formed by the formation method. A method for forming a storage battery electrode includes the steps of forming a mixture including an active material, graphene oxide, and a binder; providing a mixture over a current collector; and immersing the mixture provided over the current collector in a polar solvent containing a reducer, so that the graphene oxide is reduced.

Claims

1. A method for manufacturing a storage battery electrode, comprising the steps of:

forming a mixture comprising an active material, graphene oxide, and a binder;

providing the mixture over a current collector; and

reducing the graphene oxide to form a graphene over the current collector in a polar solvent comprising a reducer.

2. The method for manufacturing a storage battery electrode, according to claim 1, wherein the reducer comprises at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra butyl ammonium bromide, NaBH₄, LiAlH₄, ethylene glycol, polyethylene glycol, and N,N-diethylhydroxylamine.

3. The method for manufacturing a storage battery electrode, according to claim 1, wherein the polar solvent comprises at least one of water, methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, N-methylpyrrolidone, and dimethyl sulfoxide.

4. The method for manufacturing a storage battery electrode, according to claim 1, wherein the active material comprises lithium.

5. The method for manufacturing a storage battery electrode, according to claim 1, wherein the step of reducing the graphene oxide is performed at higher than or equal to room temperature and lower than or equal to 150°

C.

6. A storage battery comprising the storage battery electrode manufactured by the method according to claim 1.

7. An electronic device comprising the storage battery according to claim 6.

8. A method for manufacturing a storage battery electrode, comprising the steps of:

forming a mixture comprising an active material, graphene oxide, and a binder;

providing the mixture over a current collector; and

reducing the graphene oxide to form a graphene over the current collector by immersing the mixture in a polar solvent comprising a reducer.

9. The method for manufacturing a storage battery electrode, according to claim 8, wherein the reducer comprises at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra butyl ammonium bromide, NaBH₄, LiAlH₄, ethylene glycol, polyethylene glycol, and N,N-diethylhydroxylamine.

10. The method for manufacturing a storage battery electrode, according to claim 8, wherein the polar solvent comprises at least one of water, methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, N-methylpyrrolidone, and dimethyl sulfoxide.

11. The method for manufacturing a storage battery electrode, according to claim 8, wherein the active material comprises lithium.

12. The method for manufacturing a storage battery electrode, according to claim 8, wherein the step of reducing the graphene oxide is performed at higher than or equal to room temperature and lower than or equal to 150°

C.

13. A storage battery comprising the storage battery electrode manufactured by the method according to claim 8.

14. An electronic device comprising the storage battery according to claim 13.

15. A method for manufacturing a storage battery electrode, comprising the steps of:

forming a mixture comprising an active material, graphene oxide, and a binder;

providing the mixture over a current collector;

drying the mixture over the current collector; and

reducing the graphene oxide to form a graphene over the current collector by immersing the mixture in a polar solvent comprising a reducer.

16. The method for manufacturing a storage battery electrode, according to claim 15, wherein the reducer comprises at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra butyl ammonium bromide, NaBH₄, LiAlH₄, ethylene glycol, polyethylene glycol, and N,N-diethylhydroxylamine.

17. The method for manufacturing a storage battery electrode, according to claim 15, wherein the polar solvent comprises at least one of water, methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, N-methylpyrrolidone, and dimethyl sulfoxide.

18. The method for manufacturing a storage battery electrode, according to claim 15, wherein the active material comprises lithium.

19. The method for manufacturing a storage battery electrode, according to claim 15, wherein the step of reducing the graphene oxide is performed at higher than or equal to room temperature and lower than or equal to 150°

C.

20. A storage battery comprising the storage battery electrode manufactured by the method according to claim 15.

21. An electronic device comprising the storage battery according to claim 20.