Solid electrolyte, method for producing solid electrolyte, and lithium-ion battery

Patent metadata

Field	Value
Publication number	US-9666902-B2
Application number	US-201414520808-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Oct 31, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A solid electrolyte includes a plurality of particles having lithium ionic conductivity and a matrix which is interposed among the particles so as to be in contact with each of the particles and is formed from an amorphous material containing the following (a) and (b): (a) lithium atoms; and (b) an oxide of at least one element selected from the group consisting of boron, a Group 14 element in period 3 or lower, and a Group 15 element in period 3 or lower.

First claim

What is claimed is:

1. A solid electrolyte, comprising:
a plurality of particles having lithium ionic conductivity; and
a matrix which is in contact with each of the particles and is formed from a material containing the following (a) and (b):
(a) lithium atoms; and
(b) an oxide of at least one element selected from the group consisting of boron, a Group 14 element in period 3 or lower, and a Group 15 element in period 3 or lower,

wherein a surface of each of the particles is modified with a dispersant containing the at least one element selected from the group consisting of boron, a Group 14 element in period 3 or lower, and a Group 15 element in period 3 or lower.

2. The solid electrolyte according to claim 1 , wherein each of the particles is coated with the material.

3. The solid electrolyte according to claim 1 , wherein spaces among the particles are filled with the material.

4. The solid electrolyte according to claim 1 , wherein the matrix contains the lithium atoms and silicon oxide.

5. The solid electrolyte according to claim 1 , wherein each of the particles is formed from a crystalline material with a cubic perovskite structure, the crystalline material containing at least lithium atoms.

6. A lithium-ion battery, comprising:
a positive electrode;
a negative electrode; and
a solid electrolyte layer which is interposed between the positive electrode and the negative electrode,
wherein the solid electrolyte layer is formed from the solid electrolyte according to claim 1 .

7. The solid electrolyte according to claim 1 , wherein the surface of each of the particles is modified with the dispersant by adding the particles and the dispersant to a dispersion medium comprising n-hexadecane, and stirring the resulting mixture while heating.

Assignees

• Seiko Epson Corp

Inventors

• Yokoyama Tomofumi
• Teraoka Tsutomu

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• Y02P70/54

  Cross-Sectional Technologies · mapped topic

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title