Materials for solid electrolyte

Patent metadata

Field	Value
Publication number	US-2018366779-A1
Application number	US-201516060176-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Dec 22, 2015
Publication date	Dec 20, 2018
Grant date	—

Abstract

The present disclosure relates to a material containing the elements Li, M, P, S and X wherein M=Si, Ge or Sn, and X=F, Cl, Br or I. The material can be used as a sulfide solid electrolyte material, notably for an all-solid-state lithium battery.

First claim

1 . A material comprising the elements Li, M, P, S and X,
wherein M is at least one element selected from the group consisting of: Si, Ge, and Sn; and X is at least one halogen element selected from the group consisting of F, Cl, Br and I, wherein the material has a composition represented by the following general formula (1):
(1−Y)[Li 4+(2-δ)x MS 4 (S 1-δ X δ ) x ]·Y(PS 2.5 )  (1)

wherein:
0.5≤x≤2;
0≤δ≤1; and
0≤Y≤0.5.

2 . (canceled)

3 . The material according to claim 1 , wherein M is Si.

4 . The material according to claim 1 , wherein X is Br.

5 . The material according to claim 1 , wherein 0.7≤x≤1.5.

6 . The material according to claim 1 , wherein 0.3≤δ≤0.7.

7 . The material according to claim 1 , wherein 0.05≤Y≤0.35.

8 . A material comprising the elements Li, M, P, S, and X,
wherein M is at least one element selected from the group consisting of Si, Ge, and Sn, and X is at least one halogen element selected from the group consisting of F, Cl, Br, and I; wherein, in an X-ray diffraction measurement using a CuKα line, the material shows a peak in the positions of 2θ=15.26° (±0.50°), 17.4° (±0.50°), 25.06° (±0.50°), 29.48° (±0.50°), and 30.08° (±0.50°).

9 . A process for preparing the material according to claim 1 , comprising the steps of:
(a) providing solid sulfides Li 2 S, MS 2 (M=Si, Ge or Sn) and P 2 S 5 , as well as LiX (X=F, Cl, Br, I) as dry powders, in the stoichiometric proportions corresponding to the target product, and mixing the powders; (b) milling the mixture obtained in step (a) under an inert atmosphere; and (c) heating the milled mixture obtained in step (b) at a temperature T of 300° C.≤T≤700° C., under a pressure P of 0.1 Pa≤P≤200 Pa, for a duration t of 1 h≤t≤50 h.

10 . An all-solid-state lithium battery comprising the following elements:
a positive electrode active material layer; a solid electrolyte; and a negative electrode active material layer, wherein the solid electrolyte contains the material according to claim 1 .

11 . The material according to claim 1 , wherein 0.8≤x≤1.3.

12 . The material according to claim 1 , wherein 0.9≤x≤1.1.

13 . The material according to claim 1 , wherein x is substantially equal to 1.0.

14 . The material according to claim 1 , wherein 0.4≤δ≤0.6.

15 . The material according to claim 1 , wherein 6 is substantially equal to 0.5.

16 . The material according to claim 1 , wherein 0.10≤Y≤0.25.

Assignees

• Toyota Motor Europe

Inventors

• Katoh Yuki

Classifications

• C01G17/006

  Compounds containing germanium, with or without oxygen or hydrogen, and containing two or more other elements · 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

• H01B1/10

  sulfides · CPC title

• C01B25/14

  Sulfur, selenium, or tellurium compounds of phosphorus · CPC title