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

Patent metadata

Field	Value
Publication number	US-11881578-B2
Application number	US-202218085682-A
Country	US
Kind code	B2
Filing date	Dec 21, 2022
Priority date	Jan 9, 2015
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

In manufacturing a storage battery electrode, a method for manufacturing a storage battery electrode with high capacity and stability is provided. As a method for preventing a mixture for forming an active material layer from becoming strongly basic, a first aqueous solution is formed by mixing an active material exhibiting basicity with an aqueous solution exhibiting acidity and including an oxidized derivative of a first conductive additive; a first mixture is formed by reducing the oxidized derivative of the first conductive additive by drying the first aqueous solution; a second mixture is formed by mixing a second conductive additive and a binder; a third mixture is formed by mixing the first mixture and the second mixture; and a current collector is coated with the third mixture. The strong basicity of the mixture for forming an active material layer is lowered; thus, the binder can be prevented from becoming gelled.

First claim

The invention claimed is:

1. A method for manufacturing a storage battery electrode, comprising:
forming a first aqueous solution by mixing an active material with an aqueous solution including an oxidized derivative of a first conductive additive;
forming a first mixture by drying the aqueous solution;
forming a second mixture by mixing a second conductive additive and a binder;
forming a third mixture by mixing the first mixture and the second mixture; and
coating a current collector with the third mixture,
wherein an aqueous solution including the active material exhibits basicity, and
wherein the aqueous solution including the oxidized derivative of the first conductive additive exhibits acidity.

2. The method for manufacturing a storage battery electrode according to claim 1 , wherein the active material includes a lithium-manganese-containing complex oxide.

3. The method for manufacturing a storage battery electrode according to claim 2 , wherein a lithium nickel oxide is mixed with the lithium-manganese-containing complex oxide.

4. The method for manufacturing a storage battery electrode according to claim 1 , wherein the active material includes a lithium-containing complex phosphate.

5. The method for manufacturing a storage battery electrode according to claim 1 , wherein the active material includes a lithium-containing complex oxide.

6. The method for manufacturing a storage battery electrode according to claim 1 , further comprising a step of forming an undercoat over the current collector before coating with the third mixture.

7. The method for manufacturing a storage battery electrode according to claim 1 , wherein an oxidized derivative of a reducing agent is included in the third mixture.

8. A method for manufacturing a storage battery electrode, comprising:
forming a first aqueous solution by mixing an active material with an aqueous solution of graphene oxide;
forming a first mixture by drying the aqueous solution;
forming a second mixture by mixing a conductive additive and a binder;
forming a third mixture by mixing the first mixture and the second mixture; and
coating a current collector with the third mixture,
wherein an aqueous solution including the active material exhibits basicity, and
wherein the aqueous solution of graphene oxide exhibits acidity.

9. The method for manufacturing a storage battery electrode according to claim 8 , wherein the active material includes a lithium-manganese-containing complex oxide.

10. The method for manufacturing a storage battery electrode according to claim 9 , wherein a lithium nickel oxide is mixed with the lithium-manganese-containing complex oxide.

11. The method for manufacturing a storage battery electrode according to claim 8 , wherein the active material includes a lithium-containing complex phosphate.

12. The method for manufacturing a storage battery electrode according to claim 8 , wherein the active material includes a lithium-containing complex oxide.

13. The method for manufacturing a storage battery electrode according to claim 8 , further comprising a step of forming an undercoat over the current collector before coating with the third mixture.

14. The method for manufacturing a storage battery electrode according to claim 8 , wherein an oxidized derivative of a reducing agent is included in the third mixture.

15. The method for manufacturing a storage battery electrode according to claim 8 , wherein the active material is coated with graphene oxide in the first mixture.

16. The method for manufacturing a storage battery electrode according to claim 8 , wherein the active material is coated with graphene oxide in the third mixture.

Assignees

• Semiconductor Energy Lab

Inventors

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

Classifications

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M4/0471

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

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/625

  Carbon or graphite · CPC title