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-2025246633-A1
Application number	US-202519085664-A
Country	US
Kind code	A1
Filing date	Mar 20, 2025
Priority date	Apr 10, 2012
Publication date	Jul 31, 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 method for manufacturing an electrode for a secondary battery, comprising the steps of:
immersing a formation subject comprising a current collector and an active material comprising silicon in a dispersion liquid where a graphene oxide is dispersed, and depositing the graphene oxide on the formation subject; and reducing the graphene oxide to form a graphene having conductivity.

3 . The method according to claim 2 ,
wherein the graphene oxide is reduced by one of heating treatment and electrochemical reduction treatment.

4 . The method according to claim 2 ,
wherein the graphene having conductivity is in surface contact with the active material.

5 . The method according to claim 2 ,
wherein the active material comprises one of SiO and Mg 2 Si.

6 . The method according to claim 2 ,
wherein a length of one side of the graphene having conductivity is greater than or equal to 50 nm and less than or equal to 100 mm.

7 . The method according to claim 2 ,
wherein the graphene having conductivity is in surface contact with another graphene having conductivity.

8 . The method according to claim 2 ,
wherein the graphene having conductivity is formed by reducing the graphene oxide with a weight ratio of oxygen to carbon in the graphene oxide is 0.405 or more.

9 . A method for manufacturing an electrode for a secondary battery, comprising the steps of:
immersing a formation subject comprising a current collector and an active material comprising silicon in a dispersion liquid where a graphene oxide is dispersed, and depositing the graphene oxide on the formation subject; and reducing the graphene oxide to form a graphene having conductivity, wherein the graphene having conductivity has a sheet-like shape, and wherein the graphene having conductivity wraps the active material.

10 . The method according to claim 9 ,
wherein the graphene oxide is reduced by one of heating treatment and electrochemical reduction treatment.

11 . The method according to claim 9 ,
wherein the graphene having conductivity is in surface contact with the active material.

12 . The method according to claim 9 ,
wherein the active material comprises one of SiO and Mg 2 Si.

13 . The method according to claim 9 ,
wherein a length of one side of the graphene having conductivity is greater than or equal to 50 nm and less than or equal to 100 mm.

14 . The method according to claim 9 ,
wherein the graphene having conductivity is in surface contact with another graphene having conductivity.

15 . The method according to claim 9 ,
wherein the graphene having conductivity is formed by reducing the graphene oxide with a weight ratio of oxygen to carbon in the graphene oxide is 0.405 or more.

16 . An electrode for a secondary battery, produced by a process comprising the steps of:
immersing a formation subject comprising a current collector and an active material comprising silicon in a dispersion liquid where a graphene oxide is dispersed, and depositing the graphene oxide on the formation subject; and reducing the graphene oxide to form a graphene having conductivity.

17 . The electrode according to claim 16 ,
wherein the graphene oxide is reduced by one of heating treatment or electrochemical reduction treatment.

18 . The electrode according to claim 16 ,
wherein the graphene having conductivity is in surface contact with the active material.

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

20 . The electrode according to claim 16 ,
wherein a length of one side of the graphene having conductivity is greater than or equal to 50 nm and less than or equal to 100 mm.

21 . The electrode according to claim 16 ,
wherein the graphene having conductivity is in surface contact with another graphene having conductivity.

22 . The electrode according to claim 16 ,
wherein the graphene having conductivity is formed by reducing the graphene oxide with a weight ratio of oxygen to carbon in the graphene oxide is 0.405 or more.

23 . A method for manufacturing an electrode for a secondary battery, comprising the steps of:
immersing a formation subject comprising a current collector and an active material comprising silicon in a dispersion liquid where a graphene oxide is dispersed, and depositing the graphene oxide on the formation subject; and reducing the graphene oxide to form a graphene having conductivity, wherein the graphene having conductivity has a sheet-like shape, and wherein the graphene having conductivity wraps the active material.

24 . The method according to claim 23 ,
wherein the graphene oxide is reduced by one of heating treatment or electrochemical reduction treatment.

25 . The method according to claim 23 ,
wherein the active material comprises one of SiO and Mg 2 Si.

26 . The method according to claim 23 ,
wherein the secondary battery is a nonaqueous secondary battery.

27 . The method according to claim 23 ,
wherein a length of one side of the graphene having conductivity is greater than or equal to 50 nm and less than or equal to 100 mm.

28 . The method according to claim 23 ,
wherein the graphene having conductivity is in surface contact with another graphene having conductivity.

29 . The method according to claim 23 ,
wherein the graphene having conductivity is formed by reducing the graphene oxide with a weight ratio of oxygen to carbon in the graphene oxide is 0.405 or more.

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