Sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-2022367907-A1
Application number	US-202217814374-A
Country	US
Kind code	A1
Filing date	Jul 22, 2022
Priority date	Nov 16, 2016
Publication date	Nov 17, 2022
Grant date	—

Abstract

Provided is a sulfide solid electrolyte containing lithium, phosphorus, sulfur and chlorine, in which a molar ratio of the chlorine to the phosphorus, c (Cl/P), is greater than 1.0 and 1.9 or less, the sulfide solid electrolyte includes an argyrodite-type crystal structure, and a lattice constant of the argyrodite-type crystal structure is 9.820 Å or less.

First claim

1 . A sulfide solid electrolyte, wherein the sulfide solid electrolyte has a peak in each of regions 80.3 to 81.7 ppm, 82.4 to 83.7 ppm and 84.0 to 85.6 ppm in a solid 31 P-NMR measurement, and an area ratio of the peak in the region of 80.3 to 81.7 ppm to a total area of all peaks in the region of 78 to 92 ppm is 40% or more.

2 . The sulfide solid electrolyte according to claim 1 , wherein the area ratio of the peak in the region of 84.0 to 85.6 ppm to the total area is 30% or less.

3 . The sulfide solid electrolyte according to claim 1 , wherein the area ratio of the peak in the region of 82.4 to 83.7 ppm to the total area is 20% or more and 35% or less.

4 . The sulfide solid electrolyte according to claim 1 , wherein the sulfide solid electrolyte comprises lithium, phosphorus, sulfur and chlorine

5 . The sulfide solid electrolyte according to claim 1 , wherein the sulfide solid electrolyte has an argyrodite-type crystal structure.

6 . The sulfide solid electrolyte according to claim 4 , wherein a molar ratio of the lithium to the phosphorus, a (Li/P), a molar ratio of the sulfur to the phosphorus, b (S/P), and the molar ratio of the chlorine to the phosphorus, c (Cl/P), satisfy formulas (A) to (C): 5.0≤a≤6.5 (A); 6.1≤a+c≤7.5 (B); and 0.5≤a−b≤1.5 (C), where b>0 and c>1.0 are satisfied.

7 . The sulfide solid electrolyte according to claim 4 , having a composition of formula (1),
Li a PS b Cl c   (1)
wherein a to c satisfy formulas (A) to (C): 5.0≤a≤6.5 (A); 6.1≤a+c≤7.5 (B); and 0.5≤a−b≤1.5 (C), and b>0 and c>1.0 are satisfied.

8 . An electrode mix, comprising:
the sulfide solid electrolyte of claim 1 ; and an active material.

9 . A lithium ion battery, comprising:
the sulfide solid electrolyte of claim 1 .

10 . A lithium ion battery, comprising:
the electrode mix of claim 8 .

11 . An electrode mix, comprising:
the sulfide solid electrolyte of claim 1 .

12 . A lithium ion battery, produced by using the sulfide solid electrolyte of claim 1 .

13 . A lithium ion battery, produced by using the electrode mix of claim 8 .

14 . A lithium ion battery, comprising:
the electrode mix of claim 11 .

15 . The sulfide solid electrolyte according to claim 2 , wherein the sulfide solid electrolyte comprises lithium, phosphorus, sulfur and chlorine

16 . The sulfide solid electrolyte according to claim 2 , wherein the sulfide solid electrolyte has an argyrodite-type crystal structure.

17 . The sulfide solid electrolyte according to claim 15 , wherein a molar ratio of the lithium to the phosphorus, a (Li/P), a molar ratio of the sulfur to the phosphorus, b (S/P), and the molar ratio of the chlorine to the phosphorus, c (Cl/P), satisfy formulas (A) to (C): 5.0≤a≤6.5 (A); 6.1≤a+c≤7.5 (B); and 0.5≤a−b≤1.5 (C), where b>0 and c>1.0 are satisfied.

18 . The sulfide solid electrolyte according to claim 15 , having a composition of formula (1),
Li a PS b Cl c   (1)
wherein a to c satisfy formulas (A) to (C): 5.0≤a≤6.5 (A); 6.1≤a+c≤7.5 (B); and 0.5≤a−b≤1.5 (C), and b>0 and c>1.0 are satisfied.

19 . An electrode mix, comprising:
the sulfide solid electrolyte of claim 2 ; and an active material.

20 . A lithium ion battery, comprising:
the sulfide solid electrolyte of claim 2 .

Assignees

• Idemitsu Kosan Co

Inventors

• Utsuno Futoshi
• Nakata Akiko
• Terai Kota
• Nakagawa Masaru

Classifications

• H01B1/06

  mainly consisting of other non-metallic substances · CPC title

• C03C3/23

  containing halogen and at least one oxide, e.g. oxide of boron · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title