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

Patent metadata

Field	Value
Publication number	US-11545655-B2
Application number	US-202117171042-A
Country	US
Kind code	B2
Filing date	Feb 9, 2021
Priority date	Jan 9, 2015
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

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 an active material, comprising:
forming a first mixture comprising a lithium-manganese complex oxide coated with graphene oxide by adding the lithium-manganese complex oxide to an aqueous solution of the graphene oxide;
performing a reduction treatment on the graphene oxide by a heat treatment to the first mixture; and
drying after the reduction treatment.

2. The method for manufacturing the active material according to claim 1 , wherein a concentration of the graphene oxide in the aqueous solution is higher than or equal to 0.5 wt % and lower than or equal to 5 wt %.

3. The method for manufacturing the active material according to claim 1 , wherein the lithium-manganese complex oxide exhibits basicity.

4. The method for manufacturing the active material according to claim 1 , wherein the aqueous solution of the graphene oxide exhibits acidity.

5. The method for manufacturing the active material according to claim 1 , wherein the drying step is performed at a temperature higher than or equal to 50° C. and lower than 500° C.

6. A method for manufacturing an active material, comprising:
forming a first mixture comprising a lithium-manganese complex oxide coated with graphene oxide by adding the lithium-manganese complex oxide to an aqueous solution of the graphene oxide;
performing a reduction treatment on the graphene oxide by reacting the first mixture in a solvent comprising a reducing agent; and
drying after the reduction treatment.

7. The method for manufacturing the active material according to claim 6 , wherein a concentration of the graphene oxide in the aqueous solution is higher than or equal to 0.5 wt % and lower than or equal to 5 wt %.

8. The method for manufacturing the active material according to claim 6 , wherein the lithium-manganese complex oxide exhibits basicity.

9. The method for manufacturing the active material according to claim 7 , wherein the aqueous solution of the graphene oxide exhibits acidity.

10. The method for manufacturing the active material according to claim 7 , wherein the drying step is performed at a temperature higher than or equal to 50° C. and lower than 500° C.

Assignees

• Semiconductor Energy Lab

Inventors

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

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M2220/30

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

• H01M4/0471

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

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title