Sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-11626616-B2
Application number	US-202217647502-A
Country	US
Kind code	B2
Filing date	Jan 10, 2022
Priority date	Sep 12, 2016
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

A sulfide solid electrolyte that contains lithium, phosphorus, sulfur, chlorine and bromine, wherein in powder X-ray diffraction analysis using CuKα rays, it has a diffraction peak A at 2θ=25.2±0.5 deg and a diffraction peak B at 2θ=29.7±0.5 deg, the diffraction peak A and the diffraction peak B satisfy the following formula (A), and a molar ratio of the chlorine to the phosphorus “c (Cl/P)” and a molar ratio of the bromine to the phosphorus “d (Br/P)” satisfies the following formula (1):1.2<c+d<1.9  (1)0.845<SA/SB<1.200  (A)where SA is an area of the diffraction peak A and SB is an area of the diffraction peak B.

First claim

The invention claimed is:

1. A sulfide solid electrolyte comprising lithium, phosphorus, sulfur, chlorine and bromine, wherein
the sulfide solid electrolyte has a diffraction peak derived from lithium halide in powdery X-ray diffraction using CuKα rays, and satisfies formula (B), and
the sulfide solid electrolyte comprises an argyrodite type crystal structure:
0< I c /I A <0.08  (B)

wherein I A is an intensity of a diffraction peak at 2θ=25.2±0.5 deg and I c is an intensity of a diffraction peak in a range of 32.5 deg≤2θ≤35.5 deg.

2. The sulfide solid electrolyte according to claim 1 , wherein the sulfide solid electrolyte satisfies formula (B1):
0< I c /I A <0.07  (B1)

wherein I A is an intensity of a diffraction peak at 2θ=25.2±0.5 deg and I c is an intensity of a diffraction peak in a range of 32.5 deg≤2θ≤35.5 deg.

3. The sulfide solid electrolyte according to claim 1 , wherein
the sulfide solid electrolyte satisfies formula (B2):
0< I c /I A <0.06  (B2)

wherein I A is an intensity of a diffraction peak at 2θ=25.2±0.5 deg and I c is an intensity of a diffraction peak in a range of 32.5 deg≤2θ≤35.5 deg.

4. The sulfide solid electrolyte according to claim 1 , wherein
in powder X-ray diffraction analysis using CuKα rays, the sulfide solid electrolyte has diffraction peaks at 2θ=25.2±0.5 deg and 29.7±0.5 deg.

5. The sulfide solid electrolyte according to claim 1 , wherein a molar ratio of the chlorine to the phosphorus, c (Cl/P), and a molar ratio of the bromine to the phosphorus, d (Br/P), satisfy formula (1):
1.2< c+d< 1.9  (1).

6. The sulfide solid electrolyte according to claim 1 , wherein the molar ratio of the bromine to the phosphorus, d (Br/P), is 0.15 or more and 1.6 or less.

7. The sulfide solid electrolyte according to claim 1 , wherein the molar ratio of the chlorine to the phosphorus, c (Cl/P), and the molar ratio of the bromine to the phosphorus, d (Br/P), satisfy formula (2):
0.08< d /( c+d )<0.8  (2).

8. The sulfide solid electrolyte according to claim 1 , 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), the molar ratio of the chlorine to the phosphorus, c (Cl/P), and the molar ratio of the bromine to the phosphorus, d (Br/P), satisfy formulas (3) to (5):
5.0≤ a≤ 7.5  (3)

6.5≤ a+c+d≤ 7.5  (4)

0.5≤ a−b≤ 1.5  (5)

with the proviso that b>0, c>0 and d>0.

9. An electrode mix, comprising: the sulfide solid electrolyte according to claim 1 ; and an active material.

10. A lithium ion battery, comprising the electrode mix according to claim 9 .

11. An electrode, comprising: the sulfide solid electrolyte according to claim 1 ; and an active material.

12. A lithium ion battery, comprising the sulfide solid electrolyte according to claim 1 .

Assignees

• Idemitsu Kosan Co

Inventors

• Utsuno Futoshi
• Terai Kota
• Umeki Takashi
• Nakagawa Masaru
• Yamaguchi Hiroshi

Classifications

• H01M4/5815

  Sulfides · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• C01B25/14

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