Sulfide solid electrolyte material, lithium solid battery and method of preparing sulfide solid electrolyte material

Patent metadata

Field	Value
Publication number	US-10199681-B2
Application number	US-201314654916-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Dec 27, 2012
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A sulfide solid electrolyte material exhibiting Li ion conductivity contains an organic compound having a molecular weight within a range of 30 to 300, wherein the organic compound has a content of 0.8 wt % or less.

First claim

What is claimed is:

1. A sulfide solid electrolyte material exhibiting a Li ion conductivity comprising an aprotic organic compound having a molecular weight within a range of 30 to 300,
wherein the aprotic organic compound has a content of from 0.4 to 0.65 wt % based on an amount of the sulfide solid electrolyte material, and
wherein the sulfide solid electrolyte material contains S element, Li element and at least one of elements selected from a group consisting of P, Si, Ge, Al and B elements.

2. The sulfide solid electrolyte material according to claim 1 , wherein the sulfide solid electrolyte material further contains a halogen element.

3. The sulfide solid electrolyte material according to claim 1 , wherein the molecular weight of the aprotic organic compound is within a range of 60 to 200.

4. The sulfide solid electrolyte material according to claim 1 , wherein the aprotic organic compound is liquid at 25° C.

5. The sulfide solid electrolyte material according to claim 1 , wherein the sulfide solid electrolyte material is a sulfide glass.

6. A lithium solid battery comprising;
a positive electrode active substance layer containing a positive electrode active substance;
a negative electrode active substance layer containing a negative electrode active substance; and
a solid electrolyte layer formed between the positive electrode active substance layer and the negative electrode active substance layer, wherein at least one of the positive electrode active substance layer, the negative electrode active substance layer and the solid electrolyte layer contains the sulfide solid electrolyte material according to claim 1 .

7. A method of preparing the sulfide solid electrolyte material according to claim 1 , comprising;
an amorphization step of performing mechanical milling to a mixture of a raw material composition and the organic compound to convert the raw material composition to an amorphous state, thereby a sulfide glass is synthesized; and
a drying step of drying the sulfide glass with the organic compound remaining.

8. The method according to claim 7 , wherein the sulfide glass is dried in a range between 110° C. and 140° C. in the drying step.

Assignees

• Sugiura Koichi
• Hama Shigenori
• Ohashi Miwako
• Toyota Motor Co Ltd

Inventors

• Sugiura Koichi
• Hama Shigenori
• Ohashi Miwako

Classifications

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C03C3/323

  containing halogen, e.g. chalcohalide glasses · CPC title

• H01M2300/0068

  inorganic · CPC title