Granted Patent B2

US 12,424,656 · App. 17/763,676 · Granted Sep 23, 2025

Inventors: Yuji Hoshi (Ageo, JP); Hideaki Matsushima (Ageo, JP); Teruaki Yagi (Ageo, JP)

Assignee: MITSUI MINING & SMELTING CO., LTD.

H01M10/0562H01M10/0525H01M2300/008

Abstract

Claims (19)

1. A solid electrolyte comprising:

a compound A that comprises a crystal phase having an argyrodite-type crystal structure and that is represented by Li a PS b X c , where X is at least one elemental halogen, a represents a number of 3.0 or more and 6.0 or less, b represents a number of 3.5 or more and 4.8 or less, and c represents a number of 0.1 or more and 3.0 or less; and

a compound B that is represented by LiX, where X is as defined above,

wherein the compound B has a crystallite size of 10 nm or more and 60 nm or less.

2. The solid electrolyte according to claim 1 ,

wherein the solid electrolyte exhibits a lithium ion conductivity at 25° C. of 4.0 mS/cm or more.

3. The solid electrolyte according to claim 1 ,

wherein the compound A has a crystallite size of 100 nm or less.

4. The solid electrolyte according to claim 1 ,

wherein the compound B is represented by LiCl y Br z , where y and z are numbers that satisfy y+z=1.

5. An electrode material mixture comprising:

the solid electrolyte according to claim 1 ; and

an active material.

6. A solid electrolyte layer comprising the solid electrolyte according to claim 1 .

7. A solid-state battery comprising the solid electrolyte according to claim 1 .

8. The solid electrolyte according to claim 1 ,

wherein the solid electrolyte has a 10 th percentile volume-weighted particle size, D 10 , of 1.0 μm or less.

9. The solid electrolyte according to claim 1 ,

wherein the solid electrolyte has a 95 th percentile volume-weighted particle size, D 95 , of 8.0 μm or less.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (39)