Power storage device

Patent metadata

Field	Value
Publication number	US-9911973-B2
Application number	US-201414472962-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Sep 16, 2011
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A power storage device which has high charge/discharge capacity and less deterioration in battery characteristics due to charge/discharge and can perform charge/discharge at high speed is provided. A power storage device includes a negative electrode. The negative electrode includes a current collector and an active material layer provided over the current collector. The active material layer includes a plurality of protrusions protruding from the current collector and a graphene provided over the plurality of protrusions. Axes of the plurality of protrusions are oriented in the same direction. A common portion may be provided between the current collector and the plurality of protrusions.

First claim

What is claimed is:

1. A power storage device comprising:
a negative electrode comprising:
an active material layer comprising:
a common portion;
a first protrusion protruding from the common portion;
a second protrusion protruding from the common portion; and
a spacer layer over the first protrusion and the second protrusion;

a positive electrode over the spacer layer; and
a first electrolyte,
wherein the spacer layer comprises any one of an acrylic resin, an epoxy resin, silicon resin, polyimide, polyamide and a low-melting-point glass material,
wherein the first protrusion includes a bottom portion in contact with the common portion and a top portion, and
wherein the spacer layer has a planar shape which comprises an opening.

2. The power storage device according to claim 1 , wherein each of the first protrusion and the second protrusion comprises an active material.

3. The power storage device according to claim 2 , wherein the active material is silicon.

4. The power storage device according to claim 1 , wherein the spacer layer comprises a second electrolyte.

5. The power storage device according to claim 4 , wherein the second electrolyte is a solute of the first electrolyte.

6. The power storage device according to claim 1 , wherein first axis of the first protrusion and second axis of the second protrusion are oriented in a same direction.

7. The power storage device according to claim 1 , wherein a side surface of the spacer layer is curved.

8. The power storage device according to claim 2 , wherein the common portion comprises the active material.

9. The power storage device according to claim 1 , wherein each of the first protrusion and the second protrusion comprises phosphorus or boron as an impurity.

10. The power storage device according to claim 1 , wherein the first protrusion has translation symmetry.

11. The power storage device according to claim 1 , wherein in a longitudinal cross-sectional shape, a width of the bottom portion of the first protrusion which is in contact with the common portion is 0.1 to 1 μm.

12. A power storage device comprising:
A negative electrode comprising:
an active material layer comprising:
a common portion;
a first protrusion protruding from the common portion;
a second protrusion protruding from the common portion;
a spacer layer over the first protrusion and the second protrusion;

a positive electrode in contact the spacer layer; and
a first electrolyte,
wherein the spacer layer comprises any one of an acrylic resin, an epoxy resin, silicon resin, polyimide, polyamide and a low-melting-point glass material,
wherein the first protrusion includes a bottom portion in contact with the common portion and a top portion, and
wherein the spacer layer has a planar shape which comprises an opening.

13. The power storage device according to claim 12 , wherein the spacer layer comprises the first electrolyte.

14. The power storage device according to claim 12 , wherein the power storage device further comprises a second electrolyte.

15. The power storage device according to claim 12 , wherein first axis of the first protrusion and second axis of the second protrusion are oriented in a same direction.

16. The power storage device according to claim 12 , wherein a side surface of the spacer is curved.

17. The power storage device according to claim 1 , further comprising a graphene over the common portion and the first protrusion,
wherein the graphene is in contact with a side surface of the first protrusion.

18. The power storage device according to claim 12 , further comprising a graphene over the common portion and the first protrusion,
wherein the graphene is in contact with a side surface of the first protrusion.

19. The power storage device according to claim 1 , wherein the opening has a closed circular or polygonal loop shape.

20. The power storage device according to claim 12 , wherein the opening has a closed circular or polygonal loop shape.

Assignees

• Semiconductor Energy Lab

Inventors

• Tajima Ryota
• Yamazaki Shunpei
• Oguni Teppei
• Osada Takeshi
• Sasagawa Shinya
• Kuriki Kazutaka

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title