Sulfide solid electrolyte material, sulfide glass, solid state lithium battery, and method for producing sulfide solid electrolyte material

Patent metadata

Field	Value
Publication number	US-2016149259-A1
Application number	US-201414897332-A
Country	US
Kind code	A1
Filing date	May 26, 2014
Priority date	Jun 28, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A sulfide solid electrolyte material having a high Li ion conductivity is provided. A sulfide solid electrolyte material includes Li, P, I and S, having peaks at 2θ=20.2° and 23.6°, not having peaks at 2θ=21.0° and 28.0° in an X-ray diffraction measurement using a CuKα ray, and having a half width of the peak at 2θ=20.2° of 0.51° or less.

First claim

1 - 8 . (canceled)

9 . A sulfide solid electrolyte material comprising
an ion conductor having Li, P and S, and having a PS 4 3− structure as a main component of an anion structure, and at least one of LiI, LiBr, and LiCl, wherein the sulfide solid electrolyte material contains a high Li ion conducting phase having peaks at 2θ=20.2° and 23.6°, does not contain low Li ion conducting phase having peaks at 2θ=21.0° and 28.0° in an X-ray diffraction measurement using a CuKα ray, and has a half width of the peak at 2θ=20.2° of 0.51° or less.

10 . The sulfide solid electrolyte material according to claim 9 , comprising the LiBr,
wherein LiBr/(LiI+LiBr) is in the range of 25 mol % to 50 mol %.

11 . The sulfide solid electrolyte material according to claim 9 , comprising the LiCl,
wherein LiCl/(LiI+LiCl) is in the range of 15 mol % to 50 mol %.

12 . The sulfide solid electrolyte material according to claim 9 , using a raw material composition which contains Li 2 S, P 2 S 5 , LiI, and at least one of LiBr and LiCl,
wherein Li 2 S/(Li 2 S+P 2 S 5 ) is in the range of 76 mol % to 78 mol %.

13 . A sulfide glass, the sulfide glass being used for the sulfide solid electrolyte material according to claim 9 ,
wherein an exothermic peak of the high Li ion conducting phase (c1) and an exothermic peak of the low Li ion conducting phase (cx) are observed by differential thermal analysis, and the sulfide glass satisfies T cx −T c1 ≧55° C. when temperature of the exothermic peak of the c1 is T c1 and temperature of the exothermic peak of the cx is T cx in differential thermal analysis.

14 . The sulfide glass according to claim 13 , comprising: the ion conductor; the LiI; and the LiBr,
wherein LiBr/(LiI+LiBr) is in the range of 25 mol % to 50 mol %.

15 . A solid state lithium battery comprising: a cathode active material layer containing a cathode active material; an anode active material layer containing an anode active material; and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer,
wherein at least one of the cathode active material layer, the anode active material layer, and the solid electrolyte layer contains the sulfide solid electrolyte material according to claim 9 .

16 . A method for producing a sulfide solid electrolyte material, the sulfide solid electrolyte material being the sulfide solid electrolyte material according to claim 9 , the method comprising steps of:
an amorphizing step of obtaining a sulfide glass by amorphization of a raw material composition that contains Li 2 S, P 2 S 5 , LiI, and at least one of LiBr and LiCl; and a heat treatment step of heating the sulfide glass, wherein the method for producing a sulfide solid electrolyte material uses the sulfide glass in which an exothermic peak of the high Li ion conducting phase (c1) and an exothermic peak of the low Li ion conducting phase (cx) are observed by differential thermal analysis; and the sulfide glass satisfies T cx −T c1 ≧55° C. when temperature of the exothermic peak of the c1 is T c1 and temperature of the exothermic peak of the cx is T cx in differential thermal analysis.

Assignees

• Toyota Motor Co Ltd

Inventors

• Osada Naoki
• Hama Shigenori
• Suzuki Tomoya

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2220/30

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

• C03C3/323

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

• H01M10/0525

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

• H01M10/052

  Li-accumulators · CPC title