Sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-11271246-B2
Application number	US-202016953402-A
Country	US
Kind code	B2
Filing date	Nov 20, 2020
Priority date	Sep 12, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

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 peek 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, wherein
in the solid 31 P-NMR, the solid electrolyte has a peak at each of 81.5 to 82.5 ppm, 83.2 to 84.7 ppm, 85.2 to 86.7 ppm and 87.2 to 89.4 ppm and the ratio of the sum of the area of the peak at 81.5 to 82.5 ppm and 83.2 to 84.7 ppm relative to the total of all peaks that appear within a range of 78 to 92 ppm is 60% or more.

2. The sulfide solid electrolyte according to claim 1 , comprising lithium, phosphorus, sulfur, chlorine and bromine.

3. The sulfide solid electrolyte according to claim 2 , 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).

4. The sulfide solid electrolyte according to claim 2 , wherein the molar ratio of the bromine to the phosphorus, d (Br/P), is 0.15 or more and 1.6 or less.

5. The sulfide solid electrolyte according to claim 2 , 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).

6. The sulfide solid electrolyte according to claim 2 , 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)

provided that b>0, c>0 and d>0.

7. The sulfide solid electrolyte according to claim 1 , comprising an argyrodite type crystal structure.

8. 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.

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. 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

• H01M2300/008

  Halides · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/62

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