Graphene oxide, positive electrode for nonaqueous secondary battery using graphene oxide, method of manufacturing positive electrode for nonaqueous secondary battery, nonaqueous secondary battery, and electronic device

Patent metadata

Field	Value
Publication number	US-2025253345-A1
Application number	US-202519085677-A
Country	US
Kind code	A1
Filing date	Mar 20, 2025
Priority date	Apr 10, 2012
Publication date	Aug 7, 2025
Grant date	—

Abstract

A graphene oxide used as a raw material of a conductive additive for forming an active material layer with high electron conductivity with a small amount of a conductive additive is provided. A positive electrode for a nonaqueous secondary battery using the graphene oxide as a conductive additive is provided. The graphene oxide is used as a raw material of a conductive additive in a positive electrode for a nonaqueous secondary battery and, in the graphene oxide, the atomic ratio of oxygen to carbon is greater than or equal to 0.405.

First claim

1 . (canceled)

2 . A secondary battery comprising:
a negative electrode comprising:
a negative electrode active material comprising silicon;
a graphene having conductivity and being in surface contact with the negative electrode active material; and
a negative electrode current collector,
wherein the graphene having conductivity is a crystal structure body of carbon in which hexagonal skeletons are spread.

3 . The secondary battery according to claim 2 ,
wherein the negative electrode current collector comprises copper.

4 . The secondary battery according to claim 2 ,
wherein the negative electrode active material comprises one of SiO and Mg 2 Si.

5 . The secondary battery according to claim 2 ,
wherein the graphene having conductivity a proportion of functional groups in the crystal structure body is about 10 wt %.

6 . The secondary battery according to claim 2 ,
wherein the secondary battery is a nonaqueous secondary battery.

7 . The secondary battery according to claim 2 ,
wherein the graphene having conductivity is a graphene compound.

8 . A secondary battery comprising:
a negative electrode comprising:
a negative electrode active material comprising a metal oxide;
a graphene having conductivity and being in surface contact with the negative electrode active material; and
a negative electrode current collector,
wherein the graphene having conductivity is a crystal structure body of carbon in which hexagonal skeletons are spread.

9 . The secondary battery according to claim 8 ,
wherein the negative electrode current collector comprises copper.

10 . The secondary battery according to claim 8 ,
wherein the negative electrode active material comprises one of SiO and Mg 2 Si.

11 . The secondary battery according to claim 8 ,
wherein the graphene having conductivity a proportion of functional groups in the crystal structure body is about 10 wt %.

12 . The secondary battery according to claim 8 ,
wherein the secondary battery is a nonaqueous secondary battery.

13 . The secondary battery according to claim 8 ,
wherein the graphene having conductivity is a graphene compound.

14 . A secondary battery comprising:
a negative electrode comprising:
a negative electrode active material comprising a nitride containing lithium and a transition metal;
a graphene having conductivity and being in surface contact with the negative electrode active material; and
a negative electrode current collector,
wherein the graphene having conductivity is a crystal structure body of carbon in which hexagonal skeletons are spread.

15 . The secondary battery according to claim 14 ,
wherein the negative electrode current collector comprises copper.

16 . The secondary battery according to claim 14 ,
wherein the negative electrode active material comprises one of SiO and Mg 2 Si.

17 . The secondary battery according to claim 14 ,
wherein the graphene having conductivity a proportion of functional groups in the crystal structure body is about 10 wt %.

18 . The secondary battery according to claim 14 ,
wherein the secondary battery is a nonaqueous secondary battery.

19 . The secondary battery according to claim 14 ,
wherein the graphene having conductivity is a graphene compound.

20 . A secondary battery comprising:
a negative electrode comprising:
a negative electrode active material comprising a material which causes conversion reaction;
a graphene having conductivity and being in surface contact with the negative electrode active material; and
a negative electrode current collector,
wherein the graphene having conductivity is a crystal structure body of carbon in which hexagonal skeletons are spread.

21 . The secondary battery according to claim 20 ,
wherein the negative electrode current collector comprises copper.

22 . The secondary battery according to claim 20 ,
wherein the negative electrode active material comprises one of SiO and Mg 2 Si.

23 . The secondary battery according to claim 20 ,
wherein the graphene having conductivity a proportion of functional groups in the crystal structure body is about 10 wt %.

24 . The secondary battery according to claim 20 ,
wherein the secondary battery is a nonaqueous secondary battery.

25 . The secondary battery according to claim 20 ,
wherein the graphene having conductivity is a graphene compound.

Assignees

• Semiconductor Energy Lab

Inventors

• Todoriki Hiroatsu
• Yukawa Mikio
• Saito Yumiko
• Yamakaji Masaki
• Yatabe Rika
• Ikenuma Tatsuya

Classifications

• C01B32/23

  Oxidation · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title