Method for manufacturing storage battery electrode, storage battery electrode, storage battery, and electronic device

Patent metadata

Field	Value
Publication number	US-2018315993-A1
Application number	US-201816025069-A
Country	US
Kind code	A1
Filing date	Jul 2, 2018
Priority date	Jun 15, 2012
Publication date	Nov 1, 2018
Grant date	—

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.

First claim

1 . (canceled)

2 . A method for manufacturing a storage battery, comprising the steps of:
forming a first mixture comprising an active material, graphene oxide and a solvent; evaporating the solvent in the first mixture so as to form a second mixture comprising the active material and graphene oxide; reducing the graphene oxide in the second mixture to form a graphene, wherein the step of reducing the graphene oxide is performed in a reducing solution comprising a reducer and an organic solvent.

3 . The method for manufacturing a storage battery, according to claim 2 , wherein the graphene comprises oxygen after the step of reducing the graphene oxide.

4 . The method for manufacturing a storage battery, according to claim 3 , wherein a proportion of the oxygen is higher than or equal to 2 at. % and lower than or equal to 20 at. % in the graphene.

5 . The method for manufacturing a storage battery, according to claim 2 , wherein the reducer is one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra butyl ammonium bromide, NaBH 4 , LiAlH 4 and N,N-diethylhydroxylamine.

6 . The method for manufacturing a storage battery, according to claim 2 , wherein the organic solvent is one of methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, N-methylpyrrolidone and dimethyl sulfoxide.

7 . The method for manufacturing a storage battery, according to claim 2 ,
wherein the active material comprises lithium, and wherein the reducing solution is a solution comprising lithium.

8 . The method for manufacturing a storage battery, according to claim 2 , wherein the reducing solution comprises two kinds of solvents.

9 . The method for manufacturing a storage battery, according to claim 2 , 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.

10 . The method for manufacturing a storage battery, according to claim 2 , wherein the first mixture further comprises a polymer.

11 . An electronic device comprising the storage battery according to claim 2 .

12 . A method for manufacturing a storage battery, comprising the steps of:
forming a first mixture comprising an active material, graphene oxide and a solvent; evaporating the solvent in the first mixture so as to form a second mixture comprising the active material and graphene oxide; reducing the graphene oxide in the second mixture to form a graphene, wherein the step of reducing the graphene oxide is performed by immersing the second mixture in a reducing solution comprising a reducer and an organic solvent.

13 . The method for manufacturing a storage battery, according to claim 12 , wherein the reduced graphene oxide comprises oxygen after the step of reducing the graphene oxide.

14 . The method for manufacturing a storage battery, according to claim 13 wherein a proportion of the oxygen is higher than or equal to 2 at. % and lower than or equal to 20 at. % in the reduced graphene oxide.

15 . The method for manufacturing a storage battery, according to claim 12 , wherein the reducer is one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra butyl ammonium bromide, NaBH 4 , LiAlH 4 and N,N-diethylhydroxylamine.

16 . The method for manufacturing a storage battery, according to claim 12 , wherein the organic solvent is methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, N-methylpyrrolidone and dimethyl sulfoxide.

17 . The method for manufacturing a storage battery, according to claim 12 , wherein the reducing solution comprises lithium hydroxide.

18 . The method for manufacturing a storage battery, according to claim 12 , wherein the reducing solution comprises two kinds of solvents.

19 . The method for manufacturing a storage battery, according to claim 12 , 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 . The method for manufacturing a storage battery, according to claim 12 , wherein the first mixture further comprises a polymer.

21 . An electronic device comprising the storage battery according to claim 12 .

Assignees

• Semiconductor Energy Lab

Inventors

• Yukawa Mikio

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/0416

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title