# US 12,183,879 B2 · Sulfide solid electrolyte

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- Number: US 12,183,879 B2
- Document ID: US12183879B2
- Status: Granted
- Kind: B2
- Application number: 18/175,772
- Filed: 2023-02-28
- Published: 2023-09-07
- Granted: 2024-12-31
- Earliest claimed: 2016-09-12
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co.,Ltd.
- Inventors: Futoshi Utsuno; Kota Terai; Takashi Umeki; Masaru Nakagawa; Hiroshi Yamaguchi
- Web page: https://patentgrep.com/patent/US12183879B2

## CPC

- H01M 10/0562: Solid materials
- C01B 25/14: Sulfur, selenium, or tellurium compounds of phosphorus
- H01B 1/06: mainly consisting of other non-metallic substances
- H01B 1/10: sulfides
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/058: Construction or manufacture
- H01M 4/5815: {Sulfides}
- H01M 2300/0068: inorganic
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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