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

Patent metadata

Field	Value
Publication number	US-10923706-B2
Application number	US-201916521650-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Jan 9, 2015
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

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 reducing the oxidized derivative of the first conductive additive; and
coating a current collector with the third mixture.

2. The method for manufacturing a storage battery electrode according to claim 1 , characterized by adding a reducing agent to the first mixture after forming the first mixture.

3. The method for manufacturing a storage battery electrode according to claim 1 , characterized in that the aqueous solution including the oxidized derivative of the first conductive additive is acidic.

4. The method for manufacturing a storage battery electrode according to claim 1 , characterized in that the active material is basic.

5. A storage battery electrode manufactured by the method for manufacturing a storage battery electrode according to claim 1 .

6. A storage battery comprising a first electrode and a second electrode,
wherein the first electrode is the storage battery electrode according to claim 5 ,
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 as the other of the positive electrode and the negative electrode.

7. An electronic device comprising the storage battery according to claim 6 and a display panel, a light source, an operation key, a speaker, or a microphone.

8. 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 reducing the oxidized derivative of the first conductive additive 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.

9. The method for manufacturing a storage battery electrode according to claim 8 , characterized by adding a reducing agent to the first mixture after forming the first mixture.

10. The method for manufacturing a storage battery electrode according to claim 8 , characterized in that the aqueous solution including the oxidized derivative of the first conductive additive is acidic.

11. The method for manufacturing a storage battery electrode according to claim 8 , characterized in that the active material is basic.

12. A storage battery electrode manufactured by the method for manufacturing a storage battery electrode according to claim 8 .

13. A storage battery electrode manufactured by the method for manufacturing a storage battery electrode according to claim 8 .

14. A storage battery comprising a first electrode and a second electrode,
wherein the first electrode is the storage battery electrode according to claim 13 ,
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 as the other of the positive electrode and the negative electrode.

15. An electronic device comprising the storage battery according to claim 14 and a display panel, a light source, an operation key, a speaker, or a microphone.

Assignees

• Semiconductor Energy Lab

Inventors

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

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · 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

• H01M4/0471

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

• H01M4/625

  Carbon or graphite · CPC title