Sulfide solid electrolyte for solid-state batteries and method for production

Patent metadata

Field	Value
Publication number	US-12407016-B2
Application number	US-202418857410-A
Country	US
Kind code	B2
Filing date	Jan 9, 2024
Priority date	Feb 17, 2023
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A solid electrolyte for solid-state batteries comprises a phosphorous-free solid electrolyte having a cubic argyrodite structure. The solid electrolyte has a composition according to the molecular formula: Li6+xMxSb1−yS5−zR, where x=0 to 0.7; y=0 to 0.7 and z=0 to 0.7, wherein the (semi-) metal comprises M=Si, Sn, W and the halogen comprises R=I1, Cl1, Brz, Br1 and further wherein, in a case where R=I1, M=W and x>0. Furthermore, a production method is described.

First claim

The invention claimed is:

1. A sulfide solid electrolyte for solid-state batteries, the sulfide solid electrolyte comprising:
a phosphorous-free solid electrolyte having a cubic argyrodite structure and a composition according to the molecular formula Li 6+x M x Sb 1−y S 5−z R,
wherein 0<x≤0.7, y=0 to 0.7 and z=0 to 0.7,
wherein M is selected from the group consisting of Si and Sn, and wherein R is selected from the group consisting of Cl 1 and Br 1 .

2. The sulfide solid electrolyte according to claim 1 ,
wherein z=0 and x=y, where 0<x≤0.6.

3. A method for producing a solid electrolyte according to claim 1 , the method comprising:
mixing the reactants:
Li 2 S, and
SbS 3 or Sb 2 S 5 , and
SiS 2 and/or SnS 2 , and
LiCl and/or LiBr

into a vitreous amorphous powder mixture;
heating the amorphous powder mixture to a temperature between 470° C.-580° C. in an argon atmosphere, or heating the amorphous powder mixture in a static or dynamic vacuum at a temperature between 400-600° C., each for 1-7 days,
thereby producing the phosphorous-free solid electrolyte.

4. The method according to claim 3 , wherein the Li 2 S used in the powder mixture has a particle size of less than 3 μm.

Assignees

• Mercedes Benz Group Ag

Inventors

• Uenal Mahir
• Chang Hansen

Classifications

• H01M2300/008

  Halides · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• C01P2004/60

  Particles characterised by their size · CPC title

• C01G30/008

  Sulfides (C01G30/001 takes precedence) · CPC title