Solid electrolyte material and method for producing the same

Patent metadata

Field	Value
Publication number	US-10396395-B2
Application number	US-201815937422-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Mar 31, 2017
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

To improve the stability of an electrolyte, among the sulfide solid electrolytes of Li—P—S—X based (X is at least one of F, Cl, N and OH) containing no metal element other than lithium, a new solid electrolyte having a possibility to have high ion conductivity and a method for producing for obtaining the same easily. The disclosure achieves the object by providing a solid electrolyte material including a sulfide composition represented by a composition formula Li4−4y−x−zP4+1+y−xP5+xS4−zXz (Li4−4y−x−zP1+yS4−zXz), wherein 0.2≤x<1.0, 0≤z≤0.2, and 0≤y≤0.075, and X is at least one of F, Cl, N and OH, and the solid electrolyte material has a peak at a position of 2θ=17.8°±0.1°, 19.1°±0.1°, 21.7°±0.1°, 23.8°±0.1° and 30.85°±0.1° in X-ray diffraction measurement using a CuKα ray, and method for producing the same.

First claim

What is claimed is:

1. A solid electrolyte material comprising a sulfide composition represented by a composition formula Li 4−4y−x−z P 4+ 1+y−x P 5+ x S 4−z X z (Li 4−4y−x−z P 1−y S 4−z X z ), wherein 0.2≤x<1.0, 0≤z≤0.2, and 0≤y≤0.075, and
X is at least one of F, Cl, N and OH, and
the solid electrolyte material has a peak at a position of 2θ=17.8°±0.1°, 19.1°±0.1°, 21.7°±0.1°, 23.8°±0.1° and 30.85°±0.1° in X-ray diffraction measurement using a CuKα ray.

2. The solid electrolyte material according to claim 1 , wherein ion conductivity is 0.4 mS/cm or more.

3. A method for producing the solid electrolyte material according to claim 1 , the method comprising:
an ion conductive material synthesizing step of synthesizing an ion conductive material using a simple substance of P, a P compound, a S compound, and a Li compound as a raw material including a constituent of the sulfide composition; and
a heating step of obtaining the sulfide composition by heating the ion conductive material, and
at least one of the P compound, the S compound, and the Li compound includes at least one of a fluoride, a chloride, a nitride, and a hydroxide.

4. The method according to claim 3 , wherein a heating temperature in the heating step is in a range of 230° C. to 300° C.

Assignees

• Tokyo Inst Tech
• Toyota Motor Co Ltd

Inventors

• Kanno Ryoji
• Hori Satoshi

Classifications

• C01B17/22

  Alkali metal sulfides or polysulfides · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/0525

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

• H01M2300/008

  Halides · CPC title