Power storage device

Patent metadata

Field	Value
Publication number	US-2016233031-A1
Application number	US-201615097565-A
Country	US
Kind code	A1
Filing date	Apr 13, 2016
Priority date	Aug 26, 2011
Publication date	Aug 11, 2016
Grant date	—

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 which is a particle in which a plurality of slices of graphite is overlapped with each other with a gap therebetween. It is preferable that the grain diameter of the particle be 1 μm to 50 μm. Further, it is preferable that the electrolyte be in contact with the gap between the slices of graphite.

First claim

1 . (canceled)

2 . A method for manufacturing an active material, comprising the steps of:
preparing a suspension comprising a graphite oxide; adding a transition metal chloride to the suspension; obtaining a mixture by drying the suspension comprising the graphite oxide and the transition metal chloride; and baking the mixture.

3 . The method for manufacturing an active material according to claim 2 , further comprising the step of:
after the baking of the mixture, adding a diluted hydrochloric acid to the mixture, and performing a suction filtration to the mixture comprising the diluted hydrochloric acid.

4 . The method for manufacturing an active material according to claim 2 , further comprising the step of:
after the baking of the mixture, grinding the mixture.

5 . The method for manufacturing an active material according to claim 4 ,
wherein a diameter of particles obtained by grinding the mixture is higher than and equal to 1 μm and lower than and equal to 50 μm.

6 . The method for manufacturing an active material according to claim 2 , further comprising the step of:
applying ultrasonic wave to the suspension comprising the oxide graphite.

7 . The method for manufacturing an active material according to claim 2 , further comprising the step of:
applying ultrasonic wave to the suspension comprising the oxide graphite and the transition metal chloride.

8 . The method for manufacturing an active material according to claim 2 ,
wherein the baking is performed at a temperature higher than or equal to 300° C. and lower than or equal to 650° C.

9 . The method for manufacturing an active material according to claim 2 ,
wherein the baking is performed in an inert atmosphere or in a reducing atmosphere.

10 . The method for manufacturing an active material according to claim 2 ,
wherein the baking is performed under reduced pressure.

11 . The method for manufacturing an active material according to claim 2 ,
wherein a specific surface area of the mixture is higher than or equal to 20 m 2 /g and lower than and equal to 200 m 2 /g.

12 . A method for manufacturing a negative electrode, comprising the steps of:
preparing a suspension comprising a graphite oxide; adding a transition metal chloride to the suspension; obtaining a mixture by drying the suspension comprising the graphite oxide and the transition metal chloride; baking the mixture; making a slurry by mixing the mixture, a binder and a solvent; putting the slurry on a current collector; and drying the slurry on the current collector.

13 . The method for manufacturing a negative electrode according to claim 12 , further comprising the step of:
after the baking of the mixture, adding a diluted hydrochloric acid to the mixture, and performing a suction filtration to the mixture comprising the diluted hydrochloric acid.

14 . The method for manufacturing a negative electrode according to claim 12 , further comprising the step of:
after the baking of the mixture, grinding the mixture into pieces.

15 . The method for manufacturing a negative electrode according to claim 14 ,
wherein a diameter of particles obtained by grinding the mixture is higher than and equal to 1 μm and lower than and equal to 50 μm.

16 . The method for manufacturing a negative electrode according to claim 12 , further comprising the step of:
applying ultrasonic wave to the suspension comprising the graphite oxide.

17 . The method for manufacturing a negative electrode according to claim 12 , further comprising the step of:
applying ultrasonic wave to the suspension comprising the graphite oxide and the transition metal chloride.

18 . The method for manufacturing a negative electrode according to claim 12 ,
wherein the baking is performed at a temperature higher than or equal to 300° C. and lower than or equal to 650° C.

19 . The method for manufacturing a negative electrode according to claims 12 ,
wherein the baking is performed in an inert atmosphere or a reducing atmosphere.

20 . The method for manufacturing a negative electrode according to claim 12 ,
wherein the baking is performed under reduced pressure.

21 . The method for manufacturing a negative electrode according to claim 12 ,
wherein a specific surface area of the mixture is higher than or equal to 20 m 2 /g and lower than and equal to 200 m 2 /g.

22 . A method for manufacturing a power storage battery, comprising the steps of:
providing a separator between a positive electrode and the negative electrode according to claim 12 in a housing; filling a space of housing including the separator, the positive electrode and the negative electrode by an electrolyte.

Assignees

• Semiconductor Energy Lab

Inventors

• Momo Junpei
• Todoriki Hiroatsu
• Nomoto Kuniharu

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01G11/86

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

• H01M10/052

  Li-accumulators · CPC title

• 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