Power storage device

Patent metadata

Field	Value
Publication number	US-9343241-B2
Application number	US-201213569411-A
Country	US
Kind code	B2
Filing date	Aug 8, 2012
Priority date	Aug 26, 2011
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A power storage device with high output is provided, in which the specific surface area is increased while keeping the easy-to-handle particle size of its active material. The power storage device includes a positive electrode including a positive electrode current collector and a positive electrode active material layer, a negative electrode including a negative electrode current collector and a negative electrode active material layer, and an electrolyte. The negative electrode active material layer includes a negative electrode active material having a plurality of graphite particles. Each of the graphite particles consists of graphite layers that are overlapped with each other with a gap of 1 nm to 10 nm therebetween. It is preferable that the grain diameter of the particle be 1 μm to 50 μm. Further, the specific surface area of the particles is 20 m 2 /g to 200 m 2 /g.

First claim

The invention claimed is:

1. An electrode comprising:
a current collector; and
an active material layer,
wherein the active material layer comprises an active material exclusively of a plurality of graphite particles,
wherein each graphite particle of the plurality of graphite particles consists of a plurality of graphite layers overlapping with each other with a gap between each respective graphite layer,
wherein the gap is 1 nm to 10 nm,
wherein a grain diameter of the particle is 1 μm to 50 μm, and
wherein a specific surface area of the particle is 20 m 2 /g to 200 m 2 /g.

2. A power storage device comprising:
a positive electrode comprising a positive electrode current collector and a positive electrode active material layer;
a negative electrode comprising a negative electrode current collector and a negative electrode active material layer; and
an electrolyte,
wherein the negative electrode active material layer comprises an active material exclusively of a plurality of graphite particles,
wherein each graphite particle of the plurality of graphite particles consists of a plurality of graphite layers overlapping with each other with a gap between each respective graphite layer,
wherein the gap is 1 nm to 10 nm
wherein a grain diameter of the particle is 1 μm to 50 μm, and
wherein a specific surface area of the particle is 20 m 2 /g to 200 m 2 /g.

3. The power storage device according to claim 2 , wherein the electrolyte is in contact with the gap.

4. The power storage device according to claim 2 , wherein the power storage device is a lithium ion capacitor.

5. The power storage device according to claim 2 ,
wherein the positive electrode active material layer comprises a graphite particle, and
wherein the graphite particle comprises a plurality of graphite layers overlapping with each other with a gap between each respective graphite layer.

6. A power storage device comprising:
a positive electrode comprising a positive electrode current collector and a positive electrode active material layer;
a negative electrode comprising a negative electrode current collector and a negative electrode active material layer; and
an electrolyte,
wherein the positive electrode active material layer comprises an active material exclusively of a plurality of graphite particles,
wherein each graphite particle of the plurality of graphite particles consists of a plurality of graphite layers overlapping with each other with a gap between each respective graphite layer,
wherein the gap is 1 nm to 10 nm,
wherein a grain diameter of the particle is 1 μm to 50 μm, and
wherein a specific surface area of the particle is 20 m 2 /g to 200 m 2 /g.

7. The power storage device according to claim 6 , wherein the electrolyte is in contact with the gap.

8. The power storage device according to claim 6 , wherein the power storage device is a lithium ion capacitor.

9. The electrode according to claim 1 , wherein the gap is formed using zinc chloride.

10. The electrode according to claim 1 ,
wherein the gap includes space, and
wherein a transition metal chloride is removed from the space.

11. The power storage device according to claim 2 , wherein the gap is formed using zinc chloride.

12. The power storage device according to claim 2 ,
wherein the gap includes space, and
wherein a transition metal chloride is removed from the space.

13. The power storage device according to claim 6 , wherein the gap is formed using zinc chloride.

14. The power storage device according to claim 6 , wherein the gap includes space, and wherein a transition metal chloride is removed from the space.

Assignees

• Momo Junpei
• Todoriki Hiroatsu
• Nomoto Kuniharu
• Semiconductor Energy Lab

Inventors

• Momo Junpei
• Todoriki Hiroatsu
• Nomoto Kuniharu

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/133

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

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/38

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

• H01M10/052

  Li-accumulators · CPC title