Sulfide solid electrolyte particles

Patent metadata

Field	Value
Publication number	US-2020006808-A1
Application number	US-201816491659-A
Country	US
Kind code	A1
Filing date	Mar 8, 2018
Priority date	Mar 8, 2017
Publication date	Jan 2, 2020
Grant date	—

Abstract

A sulfide solid electrolyte particles comprising lithium, phosphorus and sulfur, having a volume-based average particle size measured by laser diffraction particle size distribution measurement of 0.1 μm or more and 10 μm or less, having a diffraction peak having 2θ ranging from 29.0 to 31.0 deg in powder X-ray diffraction measurement using CuKα ray, and an intensity ratio (Ib/Ip) of a peak intensity Ip of the diffraction peak to a diffraction intensity Ib at a high angle-side low part of the diffraction peak is less than 0.09.

First claim

1 . Sulfide solid electrolyte particles, comprising lithium, phosphorus and sulfur,
wherein a volume-based average particle size measured by laser diffraction particle size distribution measurement is 0.1 μm or more and 10 μm or less, in powder X-ray diffraction measurement using CuKα ray, the sulfide solid electrolyte particles have a diffraction peak having 2θ ranging from 29.0 to 31.0 deg, and an intensity ratio (Ib/Ip) of a peak intensity Ip of the diffraction peak to a diffraction intensity Ib at a high angle-side low part of the diffraction peak is less than 0.09.

2 . The sulfide solid electrolyte particles according to claim 1 , comprising an argyrodite-type crystal structure or an LGPS-type crystal structure.

3 . The sulfide solid electrolyte particles according to claim 1 , comprising an argyrodite-type crystal structure, wherein the diffraction peak is at 2θ=29.7+0.5 deg.

4 . The sulfide solid electrolyte particles according to claim 3 , further having a diffraction peak at 2θ=25.2+0.5 deg in powder X-ray diffraction measurement using CuKα ray.

5 . The sulfide solid electrolyte particles according to claim 1 , further comprising halogen.

6 . The sulfide solid electrolyte particles according to claim 1 , further comprising chlorine.

7 . The sulfide solid electrolyte particles according to claim 1 , further comprising two or more halogens.

8 . The sulfide solid electrolyte particles according to claim 5 , wherein a molar ratio of the halogen to the sulfur is more than 0.23 and less than 0.57.

9 . The sulfide solid electrolyte particles according to claim 1 , wherein a ratio of an area of glass-derived peaks to a total area of all peaks at 60 to 120 ppm observed in solid 31 P-NMR measurements is 0% or more and 30% or less.

10 . Sulfide solid electrolyte particles, comprising lithium, phosphorus and sulfur,
wherein a volume-based average particle size measured by laser diffraction particle size distribution measurement is 0.1 μm or more and 10 μm or less, and an ionic conductivity is 4.0 mS/cm or more.

11 . A method for producing sulfide solid electrolyte particles comprising a crystal structure of a stable phase, the method comprising:
particulating the sulfide solid electrolyte, followed by subjecting a particulated product to a heat treatment.

12 . The method according to claim 11 , wherein the crystal structure of the stable phase is an argyrodite-type crystal structure or an LGPS-type crystal structure.

13 . The method for producing sulfide solid electrolyte particles according to claim 11 , wherein the sulfide solid electrolyte comprises lithium, phosphorus, sulfur and halogen, and comprises an argyrodite-type crystal structure.

14 . The method according to claim 11 , wherein the sulfide solid electrolyte comprises two or more halogens.

15 . The method according to claim 11 , wherein a temperature of the heat treatment is between 350° C. and 700° C.

16 . The method according to claim 11 , wherein a jet mill, a ball mill or a bead mill is used for particulating.

17 . The method according to claim 11 , the method comprising:
reacting a raw material comprising lithium, phosphorus and sulfur to produce a glassy sulfide solid electrolyte.

18 . The method according to claim 17 , wherein the raw material comprises lithium sulfide, phosphorus sulfide, and lithium halide.

19 . An electrode mix comprising the sulfide solid electrolyte particles according to claim 1 and an active material.

20 . A lithium ion battery comprising the sulfide solid electrolyte particles according to claim 1 .

21 . A lithium ion battery comprising the electrode mix according to claim 19 .

Assignees

• Idemitsu Kosan Co

Inventors

• Utsuno Futoshi
• Tsuno Toshiaki
• Terai Kota
• Kimpara Hironari
• Sato Atsushi

Classifications

• H01M2300/008

  Halides · CPC title

• H01M10/0525

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

• H01M2300/0068

  inorganic · CPC title

• H01M4/62

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

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title