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

Patent metadata

Field	Value
Publication number	US-2025219050-A1
Application number	US-202519080989-A
Country	US
Kind code	A1
Filing date	Mar 17, 2025
Priority date	Aug 27, 2014
Publication date	Jul 3, 2025
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

What is claimed is:

1 . An active material layer comprising:
an active material; and graphene, wherein electric conductivity of the graphene is higher than 8.65 S/cm when resistivity of the graphene is measured by a four-point van der Pauw method.

2 . The active material layer according to claim 1 ,
wherein the graphene comprises a region covering the active material.

3 . The active material layer according to claim 1 ,
wherein the graphene comprises a region in contact with the active material.

4 . The active material layer according to claim 1 ,
where in the graphene is multilayer graphene.

5 . The active material layer according to claim 1 ,
wherein the graphene makes surface contact with the active material.

6 . The active material layer according to claim 1 ,
wherein the graphene is reduced graphene oxide comprising an alkyl group supported by an ether bond or an ester bond.

7 . A secondary battery comprising:
a current collector; and the active material layer according to claim 2 , wherein the active material layer is provided over the current collector.

8 . An active material layer comprising:
an active material; and graphene, wherein resistivity of the graphene is lower than 1.16×10 −1 Ω·cm when the resistivity of the graphene is measured by a four-point van der Pauw method.

9 . The active material layer according to claim 8 ,
wherein the graphene comprises a region covering the active material.

10 . The active material layer according to claim 8 ,
wherein the graphene comprises a region in contact with the active material.

11 . The active material layer according to claim 8 ,
where in the graphene is multilayer graphene.

12 . The active material layer according to claim 8 ,
wherein the graphene makes surface contact with the active material.

13 . The active material layer according to claim 8 ,
wherein the graphene is reduced graphene oxide comprising an alkyl group supported by an ether bond or an ester bond.

14 . A secondary battery comprising:
a current collector; and the active material layer according to claim 8 , wherein the active material layer is provided over the current collector.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya
• Yoneda Yumiko

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• C01B32/184

  Preparation · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/1393

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