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

Patent metadata

Field	Value
Publication number	US-11251415-B2
Application number	US-201916727984-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Aug 27, 2014
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

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

What is claimed is:

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;
forming a first mixture comprising the graphene oxide, a first solvent, and an active material after heating the graphene oxide;
removing at least a part of the first solvent in the first mixture;
forming a second mixture comprising graphene by reducing the graphene oxide in the first mixture after removing at least a part of the first solvent;
forming a third mixture comprising the second mixture, a binder, a conductive additive, and a second solvent; and
removing at least a part of the second solvent in the third mixture.

2. The method for manufacturing a storage battery electrode according to claim 1 , further comprising a step of applying the third mixture on a current collector before the step of removing the second solvent.

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

4. The method for manufacturing a storage battery electrode according to claim 1 ,
wherein the step of reducing the graphene oxide is performed by heating the graphene oxide, and
wherein a heating temperature at the step of heating the graphene oxide 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 1 , wherein the alcohol is 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, or tert-butyl alcohol.

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

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

8. 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 comprising the graphene oxide, a first solvent, and an active material after heating the graphene oxide;
removing the first solvent in the first mixture;
forming a second mixture comprising graphene by reducing the graphene oxide in the first mixture after removing the first solvent;
forming a third mixture comprising the second mixture, a binder, a conductive additive, and a second solvent; and
removing the second solvent in the third mixture.

9. The method for manufacturing a storage battery electrode according to claim 8 , further comprising a step of applying the third mixture on a current collector before the step of removing the second solvent.

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

11. The method for manufacturing a storage battery electrode according to claim 8 ,
wherein the step of reducing the graphene oxide is performed by heating the graphene oxide, and
wherein a heating temperature at the step of heating the graphene oxide is higher than or equal to 60° C. and lower than or equal to 150° C.

12. The method for manufacturing a storage battery electrode according to claim 8 , wherein the alcohol is 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, or tert-butyl alcohol.

13. The method for manufacturing a storage battery electrode according to claim 8 , wherein the acid is carboxylic acid.

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

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya
• Yoneda Yumiko

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• C01B32/184

  Preparation · CPC title

• H01M4/0416

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title