Conductor, power storage device, electronic device, and method for forming conductor

Patent metadata

Field	Value
Publication number	US-12080893-B2
Application number	US-202318202523-A
Country	US
Kind code	B2
Filing date	May 26, 2023
Priority date	Jun 25, 2015
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A novel electrode is provided. A novel power storage device is provided. A conductor having a sheet-like shape is provided. The conductor has a thickness of greater than or equal to 800 nm and less than or equal to 20 μm. The area of the conductor is greater than or equal to 25 mm 2 and less than or equal to 10 m 2 . The conductor includes carbon and oxygen. The conductor includes carbon at a concentration of higher than 80 atomic % and oxygen at a concentration of higher than or equal to 2 atomic % and lower than or equal to 20 atomic %.

First claim

What is claimed is:

1. A power storage device comprising:
a conductor comprising a graphene compound,
wherein an interlayer distance between adjacent layers in the graphene compound is longer than or equal to 0.335 nm and shorter than or equal to 0.7 nm,
wherein an area of the conductor is larger than or equal to 25 mm 2 and smaller than or equal to 10 m 2 , and
wherein the conductor is configured to function as a current collector.

2. The power storage device according to claim 1 , wherein a proportion of carbon in the graphene compound is higher than 80% with respect to the whole conductor.

3. The power storage device according to claim 1 , wherein a thickness of the graphene compound is greater than or equal to 800 nm and less than or equal to 20 μm.

4. The power storage device according to claim 1 , wherein a length of one side of the graphene compound is greater than or equal to 50 nm and less than or equal to 100 μm.

5. The power storage device according to claim 1 , wherein the graphene compound at least comprises one of epoxy group, carboxy group, and hydroxyl group bonded to carbon.

6. The power storage device according to claim 1 , wherein the graphene compound is a graphene compound sheet.

7. A power storage device comprising:
a positive electrode;
a negative electrode; and
a conductor comprising a graphene compound,
wherein an interlayer distance between adjacent layers in the graphene compound is longer than or equal to 0.335 nm and shorter than or equal to 0.7 nm,
wherein an area of the conductor is larger than or equal to 25 mm 2 and smaller than or equal to 10 m 2 ,
wherein the conductor comprises a region whose electrical conductivity is greater than or equal to 0.1 S/cm and less than or equal to 10 7 S/cm, and
wherein the conductor is configured to function as a current collector.

8. The power storage device according to claim 7 , wherein a proportion of carbon in the graphene compound is higher than 80% with respect to the whole conductor.

9. The power storage device according to claim 7 , wherein a thickness of the graphene compound is greater than or equal to 800 nm and less than or equal to 20 μm.

10. The power storage device according to claim 7 , wherein a length of one side of the graphene compound is greater than or equal to 50 nm and less than or equal to 100 μm.

11. The power storage device according to claim 7 , wherein the graphene compound at least comprises one of epoxy group, carboxy group, and hydroxyl group bonded to carbon.

12. The power storage device according to claim 7 , wherein the graphene compound is a graphene compound sheet.

13. A power storage device comprising:
a conductor,
wherein the conductor is obtained by subjecting a graphene compound sheet to thermal reduction and chemical reduction after the thermal reduction,
wherein the thermal reduction is performed at a temperature higher than or equal to 120° C. and lower than or equal to 400° C.,
wherein the chemical reduction is performed at a temperature higher than or equal to 40° C. and lower than or equal to 70° C.,
wherein an electrical conductivity of the conductor is S/cm, and
wherein the conductor is configured to function as a current collector.

14. The power storage device according to claim 13 , wherein ascorbic acid is used as a reducing agent in the chemical reduction.

Assignees

• Semiconductor Energy Lab

Inventors

• Ochiai Teruaki
• Kawakami Takahiro
• Miwa Takuya

Classifications

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/36

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01M4/625

  Carbon or graphite · CPC title