Sulfide solid electrolyte particles
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 to 10 μm, having a diffraction peak having 2θ of 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 Ib at a high angle-side low part of the diffraction peak to a peak intensity Ip of the diffraction peak is less than 0.09.
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 from 0.1 μm to 10 μm,
in powder X-ray diffraction measurement using CuKα ray, the sulfide solid electrolyte particles have a diffraction peak having 2θ of from 29.0 to 31.0 deg,
an intensity ratio (Ib/Ip) of a peak intensity Ib at a high angle-side low part of the diffraction peak to a peak intensity Ip of the diffraction peak is less than 0.09,
the sulfide solid electrolyte particles comprise an argyrodite-type crystal structure, and
the sulfide solid electrolyte particles comprise at least two halogens.
2. The sulfide solid electrolyte particles according to claim 1 , wherein the diffraction peak is at 2θ=29.7±0.5 deg.
3. The sulfide solid electrolyte particles according to claim 2 , further having a diffraction peak at 2θ=25.2±0.5 deg in powder X-ray diffraction measurement using CuKα ray.
4. The sulfide solid electrolyte particles according to claim 1 , wherein a molar ratio of the at least two halogens to the sulfur is from more than 0.23 to less than 0.57.
5. 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 ppm to 120 ppm observed in solid 31 P-NMR measurements is from 0% to 30%.
6. An electrode mix comprising the sulfide solid electrolyte particles of claim 1 and an active material.
7. A lithium ion battery comprising the sulfide solid electrolyte particles of claim 1 .
8. A lithium ion battery comprising the electrode mix of claim 6 .
9. 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 from 0.1 μm to 10 μm,
an ionic conductivity is 4.0 mS/cm or more,
the sulfide solid electrolyte particles comprise an argyrodite-type crystal structure, and
the sulfide solid electrolyte particles comprise at least two halogens.
10. A method for producing sulfide solid electrolyte particles comprising a crystal structure of a stable phase, the method comprising:
pulverizing the sulfide solid electrolyte, followed by subjecting a pulverized product to a heat treatment,
wherein the crystal structure of the stable phase is an argyrodite-type crystal structure, and
the sulfide solid electrolyte particles comprise at least two halogens.
11. The method according to claim 10 , wherein the sulfide solid electrolyte comprises lithium, phosphorus, sulfur and halogen, and comprises an argyrodite-type crystal structure.
12. The method according to claim 10 , wherein a temperature of the heat treatment is from 350° C. to 700° C.
13. The method according to claim 10 , wherein a jet mill, a ball mill or a bead mill is used for the pulverizing.
14. The method according to claim 10 , further comprising:
reacting a raw material comprising lithium, phosphorus and sulfur, thereby producing a glassy sulfide solid electrolyte.
15. The method according to claim 14 , wherein the raw material comprises lithium sulfide, phosphorus sulfide, and lithium halide.