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-2025253344-A1
Application number	US-202519085651-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:
an active material; a graphene having conductivity and being in surface contact with the active material; and a current collector, wherein, when the secondary battery is charged and discharged, lithium ion is intercalated into or deintercalated from the active material.

3 . The secondary battery according to claim 2 ,
wherein the current collector comprises one of aluminum and copper.

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

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

6 . 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, when the secondary battery is charged and discharged, lithium ion is intercalated into or deintercalated from the negative electrode active material.

7 . The secondary battery according to claim 6 ,
wherein the negative electrode active material comprises one of SiO and Mg2Si.

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

9 . The secondary battery according to claim 6 ,
wherein the graphene having conductivity is a graphene compound.

10 . The secondary battery according to claim 6 , further comprising:
a positive electrode comprising a positive electrode active material, wherein the positive electrode active material is one of a lithium-containing composite oxide with an olivine crystal structure and a lithium-containing composite oxide with a layered rock-salt crystal structure.

11 . The secondary battery according to claim 10 , further comprising:
wherein the lithium-containing composite oxide with the olivine crystal structure is LiMPO 4 .

12 . The secondary battery according to claim 10 , further comprising:
wherein the lithium-containing composite oxide with the layered rock-salt crystal structure is lithium cobalt oxide.

13 . 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 comprising copper, and
wherein, when the secondary battery is charged and discharged, lithium ion is intercalated into or deintercalated from the negative electrode active material.

14 . The secondary battery according to claim 13 ,
wherein the negative electrode active material comprises one of SiO and Mg2Si.

15 . The secondary battery according to claim 13 ,
wherein the secondary battery is a nonaqueous secondary battery.

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

17 . The secondary battery according to claim 13 , further comprising:
a positive electrode comprising a positive electrode active material, wherein the positive electrode active material is one of a lithium-containing composite oxide with an olivine crystal structure and a lithium-containing composite oxide with a layered rock-salt crystal structure.

18 . The secondary battery according to claim 17 , further comprising:
wherein the lithium-containing composite oxide with the olivine crystal structure is LiMPO 4 .

19 . The secondary battery according to claim 17 , further comprising: wherein the lithium-containing composite oxide with the layered rock-salt crystal structure is lithium cobalt oxide.

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