All solid state battery and method for producing all solid state battery

Patent metadata

Field	Value
Publication number	US-2020044284-A1
Application number	US-201916508496-A
Country	US
Kind code	A1
Filing date	Jul 11, 2019
Priority date	Aug 2, 2018
Publication date	Feb 6, 2020
Grant date	—

Abstract

A main object of the present disclosure is to provide an all solid state battery of which volume change due to charge and discharge is reduced. The present disclosure achieves the object by providing an all solid state battery comprising a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer contains a Si-based active material of which average particle size is less than 2.6 μm, and a first solid electrolyte.

First claim

What is claimed is:

1 . An all solid state battery comprising a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein
the anode layer contains a Si-based active material of which average particle size is less than 2.6 μm, and a first solid electrolyte.

2 . The all solid state battery according to claim 1 , wherein a coating layer containing a second solid electrolyte is formed on a surface of the Si-based active material.

3 . The all solid state battery according to claim 2 , wherein a coverage of the coating layer is 70% or more.

4 . The all solid state battery according to claim 2 , wherein a thickness of the coating layer is 30 nm or less.

5 . The all solid state battery according to claim 2 , wherein the coating layer contains a conductive material.

6 . The all solid state battery according to claim 5 , wherein a specific surface area of the conductive material is 370 m 2 /g or more.

7 . The all solid state battery according to claim 1 , wherein, in a cross-section of the anode layer, when a pore having an area of 0.1 μm 2 or less is regarded as a micro pore, the number of the micro pore per unit area is 5 pieces/μm 2 or more.

8 . A method for producing an all solid state battery comprising a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer, the method comprises steps of:
a preparing step of preparing a Si-based active material of which average particle size is less than 2.6 μm; and an anode layer forming step of forming the anode layer using an anode mixture containing the Si-based active material and a first solid electrolyte.

9 . The method for producing the all solid state battery according to claim 8 , wherein in the preparing step, a compression shearing treatment is conducted to a mixture containing the Si-based active material and a second solid electrolyte to form a coating layer containing the second solid electrolyte on a surface of the Si-based active material.

10 . The method for producing the all solid state battery according to claim 9 , wherein in the mixture, an average particle size of the Si-based active material is smaller than an average particle size of the second solid electrolyte.

11 . The method for producing the all solid state battery according to claim 9 , wherein peripheral speed in the compression shearing treatment is 26.4 m/s or more.

Assignees

• Toyota Motor Co Ltd

Inventors

• Fujino Shizuka
• Iwasaki Masahiro

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M10/0525 Primary

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

• H01M2300/0068

  inorganic · CPC title