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

Patent metadata

Field	Value
Publication number	US-2016118666-A1
Application number	US-201514885583-A
Country	US
Kind code	A1
Filing date	Oct 16, 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 under mild conditions is increased, 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 first mixture containing an active material, graphene oxide, and a solvent is formed; a reducing agent is added to the first mixture and the graphene oxide is reduced to form a second mixture; a binder is mixed with the second mixture to form a third mixture; and the third mixture is applied to a current collector and the solvent is evaporated to form an active material layer.

First claim

What is claimed is:

1 . A manufacturing method of a storage battery electrode, comprising the steps of:
forming a first mixture containing an active material, graphene oxide, and a solvent; adding a reducing agent to the first mixture to form a second mixture; mixing a binder with the second mixture to form a third mixture; and applying the third mixture to a current collector and evaporating the solvent to form an active material layer.

2 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein the reducing agent is at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, sodium tetrahydroborate, lithium aluminum hydride, and N,N-diethylhydroxylamine.

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 adding the reducing agent to the first mixture.

4 . The manufacturing method of a storage battery electrode, according to claim 1 , wherein the solvent is evaporated by heating at a temperature higher than or equal to room temperature and lower than or equal to 100° C.

5 . 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.

6 . A storage battery electrode comprising:
a current collector; and an active material layer, wherein the active material layer comprises an active material, a conductive additive containing graphene, a binder, and a reducing agent.

7 . The storage battery electrode according to claim 6 , wherein the reducing agent is at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, sodium tetrahydroborate, lithium aluminum hydride, and N,N-diethylhydroxylamine.

8 . A storage battery comprising:
a first electrode; and a second electrode, wherein the first electrode is the storage battery electrode according to claim 6 , wherein the first electrode has a function of operating as one of a positive electrode and a negative electrode, and wherein the second electrode has a function of operating the other of the positive electrode and the negative electrode.

9 . An electronic device comprising:
the storage battery according to claim 8 ; and a display panel, a light source, an operation key, a speaker, or a microphone.

10 . A storage battery electrode comprising:
a current collector; and an active material layer, wherein the active material layer comprises an active material, a conductive additive containing graphene, a binder, and an oxidized derivative of a reducing agent.

11 . The storage battery electrode according to claim 10 , wherein the reducing agent is at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, sodium tetrahydroborate, lithium aluminum hydride, and N,N-diethylhydroxylamine.

12 . A storage battery comprising:
a first electrode; and a second electrode, wherein the first electrode is the storage battery electrode according to claim 10 , wherein the first electrode has a function of operating as one of a positive electrode and a negative electrode, and wherein the second electrode has a function of operating the other of the positive electrode and the negative electrode.

13 . An electronic device comprising:
the storage battery according to claim 12 ; and a display panel, a light source, an operation key, a speaker, or a microphone.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya
• Kawakami Takahiro
• Momma Yohei
• Ochiai Teruaki

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/621

  Binders · CPC title