Sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-2022131185-A1
Application number	US-202217647502-A
Country	US
Kind code	A1
Filing date	Jan 10, 2022
Priority date	Sep 12, 2016
Publication date	Apr 28, 2022
Grant date	—

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

1 - 20 . (canceled)

21 . 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.

22 . The sulfide solid electrolyte according to claim 21 , 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.

23 . The sulfide solid electrolyte according to claim 21 , 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.

24 . The sulfide solid electrolyte according to claim 21 , 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.

25 . The sulfide solid electrolyte according to claim 21 , 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).

26 . The sulfide solid electrolyte according to claim 21 , wherein the molar ratio of the bromine to the phosphorus, d (Br/P), is 0.15 or more and 1.6 or less.

27 . The sulfide solid electrolyte according to claim 21 , 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).

28 . The sulfide solid electrolyte according to claim 21 , 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.

29 . An electrode mix, comprising: the sulfide solid electrolyte according to claim 21 ; and an active material.

30 . An electrode, comprising: the sulfide solid electrolyte according to claim 21 ; and an active material.

31 . A lithium ion battery, comprising the sulfide solid electrolyte according to claim 21 .

32 . A lithium ion battery, comprising the electrode mix according to claim 29 .

Assignees

• Idemitsu Kosan Co

Inventors

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

Classifications

• 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

• H01M4/62

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

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0068

  inorganic · CPC title