Sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-12183879-B2
Application number	US-202318175772-A
Country	US
Kind code	B2
Filing date	Feb 28, 2023
Priority date	Sep 12, 2016
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

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 production method for a sulfide solid electrolyte that comprises an argyrodite type crystal structure, the method comprising:
pulverizing and mixing raw materials that comprise lithium, phosphorus, sulfur, chlorine and bromine to prepare an intermediate, and
heat-treating the intermediate at a temperature of 350 to 480° C., wherein
a molar ratio of the chlorine to the phosphorus, c, and a molar ratio of the bromine to the phosphorus, d, of the raw materials satisfy a formula of 1.2<c+d<1.9.

2. The production method according to claim 1 , wherein d is 0.15 or more and 1.6 or less.

3. The production method according to claim 1 , wherein 0.08<d/(c+d)<0.8.

4. The production method according to claim 1 , wherein a molar ratio of the lithium to the phosphorus, a, a molar ratio of the sulfur to the phosphorus, b, the molar ratio of the chlorine to the phosphorus, c, and the molar ratio of the bromine to the phosphorus, d, satisfy formulas of 5.0≤a≤7.5, 6.5≤a+c+d≤7.5, and 0.5≤a−b≤1.5, where b>0, c>0 and d>0.

5. The production method according to claim 1 , wherein c+d is 1.4 or more and 1.8 or less.

6. The production method according to claim 1 , wherein the heat treatment temperature is 360 to 460° C.

7. The production method according to claim 1 , wherein the atmosphere of the heat treatment is an inert gas atmosphere.

Assignees

• Idemitsu Kosan Co

Inventors

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

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0525

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

• H01M4/5815

  Sulfides · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title