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

Patent metadata

Field	Value
Publication number	US-2016064726-A1
Application number	US-201514836420-A
Country	US
Kind code	A1
Filing date	Aug 26, 2015
Priority date	Aug 27, 2014
Publication date	Mar 3, 2016
Grant date	—

Abstract

To provide graphene oxide that has high dispersibility and is easily reduced. To provide graphene with high electron conductivity. To provide a storage battery electrode including an active material layer with high electric conductivity and a manufacturing method thereof. To provide a storage battery with increased discharge capacity. A method for manufacturing a storage battery electrode that is to be provided includes a step of dispersing graphene oxide into a solution containing alcohol or acid, a step of heating the graphene oxide dispersed into the solution, and a step or reducing the graphene oxide.

First claim

1 . A method for manufacturing a storage battery electrode, comprising the steps of:
dispersing graphene oxide into a solution, the solution containing alcohol or acid; heating the graphene oxide in the solution; reducing the graphene oxide; and forming an active material layer containing graphene.

2 . A method for manufacturing a storage battery electrode, comprising the steps of:
dispersing graphene oxide into a solution, the solution containing alcohol or acid; heating the graphene oxide in the solution; forming a mixture of the graphene oxide, an active material, a binder, and a solvent; applying the mixture on a current collector; removing the solvent in the mixture after applying; and reducing the graphene oxide in the mixture, so that an active material layer containing graphene is formed over the current collector.

3 . A method for manufacturing a storage battery electrode, comprising the steps of:
dispersing graphene oxide into a solution, the solution containing alcohol or acid; heating the graphene oxide in the solution; forming a first mixture of the graphene oxide and an active material; forming a second mixture by reducing the graphene oxide in the first mixture; forming a third mixture of the second mixture, a binder, a conductive additive, and a solvent, applying the third mixture on a current collector; and removing the solvent in the third mixture, so that an active material layer containing graphene is formed over the current collector.

4 . The method for manufacturing a storage battery electrode according to claim 1 ,
wherein the step of reducing is performed by heating the graphene oxide, and wherein a heating temperature is higher than or equal to 60° C. and lower than or equal to 150° C.

5 . The method for manufacturing a storage battery electrode according to claim 2 ,
wherein the step of reducing is performed by heating the graphene oxide, and wherein a heating temperature is higher than or equal to 60° C. and lower than or equal to 150° C.

6 . The method for manufacturing a storage battery electrode according to claim 3 ,
wherein the step of reducing is performed by heating the graphene oxide, and wherein a heating temperature is higher than or equal to 60° C. and lower than or equal to 150° C.

7 . The method for manufacturing a storage battery electrode according to claim 1 , wherein the step of reducing is performed by immersing the graphene oxide in a polar solvent containing a reducing agent.

8 . The method for manufacturing a storage battery electrode according to claim 2 , wherein the step of reducing is performed by immersing the graphene oxide in a polar solvent containing a reducing agent.

9 . The method for manufacturing a storage battery electrode according to claim 3 , wherein the step of reducing is performed by immersing the graphene oxide in a polar solvent containing a reducing agent.

10 . The method for manufacturing a storage battery electrode according to claim 1 , wherein the alcohol is 1-propanol or 2-propanol.

11 . The method for manufacturing a storage battery electrode according to claim 2 , wherein the alcohol is 1-propanol or 2-propanol.

12 . The method for manufacturing a storage battery electrode according to claim 3 , wherein the alcohol is 1-propanol or 2-propanol.

13 . The method for manufacturing a storage battery electrode according to claim 1 , wherein the acid is carboxylic acid.

14 . The method for manufacturing a storage battery electrode according to claim 2 , wherein the acid is carboxylic acid.

15 . The method for manufacturing a storage battery electrode according to claim 3 , wherein the acid is carboxylic acid.

16 . Graphene comprising an alkyl group supported by an ether bond or an ester bond.

17 . The graphene according to claim 16 , wherein the alkyl group has greater than or equal to 1 and less than or equal to 4 carbon atoms.

18 . The graphene according to claim 16 , wherein the alkyl group is 1-propoxy group or 2-propoxy group.

19 . A storage battery comprising:
a first electrode; and a second electrode, wherein the first electrode comprises:
a current collector; and
an active material layer over the current collector,
the active material layer comprising graphene, an active material, and a binder, and
the graphene including an alkyl group supported by an ether bond or an ester bond,
wherein the first electrode functions as one of a positive electrode and a negative electrode, and wherein the second electrode functions as the other of the positive electrode and the negative electrode.

20 . The storage battery according to claim 19 , wherein the alkyl group has greater than or equal to 1 and less than or equal to 4 carbon atoms.

21 . The storage battery according to claim 19 , wherein the alkyl group is 1-propoxy group or 2-propoxy group.

22 . An electronic device comprising the storage battery according to claim 19 and at least one of a display panel, an operation key, a speaker, and a microphone.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya
• Yoneda Former Saito Yumiko

Classifications

• C01B32/184

  Preparation · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/0416

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