Material for electrode of power storage device, power storage device, and electrical appliance

Patent metadata

Field	Value
Publication number	US-9754728-B2
Application number	US-201314032214-A
Country	US
Kind code	B2
Filing date	Sep 20, 2013
Priority date	Oct 9, 2012
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

To improve the reliability of a power storage device. A granular active material including carbon is used, and a net-like structure is formed on part of a surface of the granular active material. In the net-like structure, a carbon atom included in the granular active material is bonded to a silicon atom or a metal atom through an oxygen atom. Formation of the net-like structure suppresses reductive decomposition of an electrolyte solution, leading to a reduction in irreversible capacity. A power storage device using the above active material has high cycle performance and high reliability.

First claim

What is claimed is:

1. A material for an electrode of a power storage device comprising:
a granular active material comprising a carbon atom; and
a film having a net-like structure over the granular active material,
wherein the net-like structure comprises a plurality of bonds between the carbon atom and one of a silicon atom and a metal atom through an oxygen atom, and
wherein the film partly covers a surface of the granular active material so that the surface of the granular active material has a first region which is covered with the film, and a second region which is not covered with the film.

2. The material for an electrode of a power storage device according to claim 1 ,
wherein the granular active material comprises a graphite particle.

3. The material for an electrode of a power storage device according to claim 1 ,
wherein the metal atom is one of a niobium atom, a titanium atom, a vanadium atom, a tantalum atom, a tungsten atom, a zirconium atom, a molybdenum atom, a hafnium atom, a chromium atom, and an aluminum atom.

4. The material for an electrode of a power storage device according to claim 1 , further comprising a plurality of oxide layers over the film,
wherein each of the plurality of oxide layers comprises a bond of the one of the silicon atom and the metal atom, and an oxygen atom.

5. A power storage device comprising a negative electrode, the negative electrode comprising the material for an electrode of a power storage device according to claim 1 .

6. An electrical appliance comprising the power storage device according to claim 5 .

7. A material for an electrode of a power storage device comprising:
a granular active material comprising a carbon atom; and
a film having a net-like structure over the granular active material,
wherein the net-like structure comprises a plurality of bonds between the carbon atom and a silicon atom through an oxygen atom, and
wherein the film partly covers a surface of the granular active material so that the surface of the granular active material has a first region which is covered with the film, and a second region which is not covered with the film.

8. The material for an electrode of a power storage device according to claim 7 ,
wherein the granular active material comprises a graphite particle.

9. The material for an electrode of a power storage device according to claim 7 , further comprising a plurality of oxide layers over the film,
wherein each of the plurality of oxide layers comprises a bond of the silicon atom and an oxygen atom.

10. A power storage device comprising a negative electrode, the negative electrode comprising the material for an electrode of a power storage device according to claim 7 .

11. An electrical appliance comprising the power storage device according to claim 10 .

12. A material for an electrode of a power storage device comprising:
a granular active material comprising a carbon atom; and
a film having a net-like structure over the granular active material,
wherein the net-like structure comprises a plurality of bonds between the carbon atom and one of a silicon atom and a metal atom through an oxygen atom,
wherein the granular active material comprises a plurality of graphene layers,
wherein the film partly covers a surface of the granular active material so that the surface of the granular active material has a first region which is covered with the film, and a second region which is not covered with the film, and
wherein the net-like structure exists at end portions of part of the plurality of graphene layers.

13. The material for an electrode of a power storage device according to claim 12 ,
wherein the metal atom is one of a niobium atom, a titanium atom, a vanadium atom, a tantalum atom, a tungsten atom, a zirconium atom, a molybdenum atom, a hafnium atom, a chromium atom, and an aluminum atom.

14. The material for an electrode of a power storage device according to claim 12 , further comprising a plurality of oxide layers over the film,
wherein each of the plurality of oxide layers comprises a bond of the one of the silicon atom and the metal atom, and an oxygen atom.

15. A power storage device comprising a negative electrode, the negative electrode comprising the material for an electrode of a power storage device according to claim 12 .

16. An electrical appliance comprising the power storage device according to claim 15 .

Assignees

• Semiconductor Energy Lab

Inventors

• Inoue Nobuhiro
• Tajima Ryota
• Moriwaka Tamae
• Momo Junpei
• Oguni Teppei
• Kimura Kai
• Kuriki Kazutaka
• Yamazaki Shunpei

Classifications

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title

• H01M4/133

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

• H01G11/06 Primary

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/366

  as layered products · CPC title