Storage battery electrode, manufacturing method thereof, storage battery, and electronic device

Patent metadata

Field	Value
Publication number	US-2016118646-A1
Application number	US-201514887370-A
Country	US
Kind code	A1
Filing date	Oct 20, 2015
Priority date	Oct 24, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

In manufacture of a storage battery electrode containing graphene as a conductive additive, the efficiency of reduction of graphene oxide is reduced with high efficiency under mild conditions, and cycle characteristics and rate characteristics of a storage battery are improved. Provided is a manufacturing method of a storage battery electrode. In the manufacturing method, a paste containing an active material, a binder, graphene oxide, and a solvent is formed; the paste is applied to a current collector and the solvent contained in the paste is evaporated to form an active material layer; the active material layer is immersed in a liquid containing alcohol; and the active material layer is taken out from the liquid and heated so that the graphene oxide is reduced.

First claim

What is claimed is:

1 . A manufacturing method of a storage battery electrode, comprising the steps of:
forming a paste containing an active material, a binder, graphene oxide, and a solvent; applying the paste to a current collector; evaporating the solvent contained in the paste to form an active material layer; immersing the active material layer in a liquid containing alcohol; and heating the active material layer after taking out the active material layer from the liquid.

2 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein the alcohol is methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, or tent-butyl alcohol.

3 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein the graphene oxide is reduced so as to be graphene in the step of heating the active material layer.

4 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein a length of one side of the graphene oxide is greater than or equal to 50 nm and less than or equal to 100 μm.

5 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein a temperature of the liquid containing alcohol is higher than or equal to 40° C. and lower than or equal to 70° C.

6 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein the step of heating the active material layer is performed at a temperature higher than or equal to 80° C. and lower than or equal to 150° C.

7 . A method for forming a storage battery, wherein the storage battery comprises a storage battery electrode manufactured by the manufacturing method according to claim 1 .

8 . A manufacturing method of a storage battery electrode, comprising the steps of:
forming a paste containing an active material, a binder, graphene oxide, a conductive additive, and a solvent; applying the paste to a current collector; evaporating the solvent contained in the paste to form an active material layer; immersing the active material layer in a liquid containing alcohol; and heating the active material layer after taking out the active material layer from the liquid.

9 . The manufacturing method of a storage battery electrode, according to claim 8 , wherein the alcohol is methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, or tent-butyl alcohol.

10 . The manufacturing method of a storage battery electrode, according to claim 8 , wherein the graphene oxide is reduced so as to be graphene in the step of heating the active material layer.

11 . The manufacturing method of a storage battery electrode, according to claim 8 , wherein a length of one side of the graphene oxide is greater than or equal to 50 nm and less than or equal to 100 μm.

12 . The manufacturing method of a storage battery electrode, according to claim 8 , wherein a temperature of the liquid containing alcohol is higher than or equal to 40° C. and lower than or equal to 70° C.

13 . The manufacturing method of a storage battery electrode, according to claim 8 , wherein the step of heating the active material layer is performed at a temperature higher than or equal to 80° C. and lower than or equal to 150° C.

14 . A method for forming a storage battery, wherein the storage battery comprises a storage battery electrode manufactured by the manufacturing method according to claim 8 .

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/0416 Primary

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

• H01M4/0438 Primary

  by electrochemical processing (electroless electrochemical plating C23C18/54) · CPC title