Method for producing sulfide solid electrolyte including Sn

Patent metadata

Field	Value
Publication number	US-12525640-B2
Application number	US-202117792524-A
Country	US
Kind code	B2
Filing date	Jan 6, 2021
Priority date	Jan 17, 2020
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A method for producing a sulfide solid electrolyte includes: preparing a uniform solution that includes at least elemental lithium (Li), elemental tin (Sn), elemental phosphorus (P), and elemental sulfur (S) in an organic solvent; removing the organic solvent from the uniform solution to obtain a precursor; and heat-treating the precursor to obtain a sulfide solid electrolyte.

First claim

The invention claimed is:

1 . A method for producing a sulfide-based solid electrolyte which comprises:
preparing a homogeneous solution that includes at least elemental lithium (Li), elemental tin (Sn), elemental phosphorus (P) and elemental sulfur (S) in an organic solvent; removing the organic solvent from the homogeneous solution to obtain a precursor; and heat-treating the precursor to obtain the sulfide-based solid electrolyte; wherein the preparing of the homogenous solution comprises: mixing Li 2 S and P 2 S 5 with each other in the organic solvent to prepare an Li—P—S homogeneous solution; preparing an Li—Sn—S homogeneous solution that includes at least elemental lithium (Li), elemental tin (Sn) and elemental sulfur (S) in the organic solvent; wherein the preparing of the Li—Sn—S homogeneous solution comprises mixing Li 2 S, SnS, and S with each other in the organic solvent to prepare the Li—Sn—S homogeneous solution; and mixing the Li—P—S homogeneous solution and the Li—Sn—S homogeneous solution with each other to prepare the homogeneous solution.

2 . The method according to claim 1 , wherein the organic solvent is at least one selected from the group consisting of an ether-based solvent, a nitrile-based solvent and an ester-based solvent.

3 . The method according to claim 1 , wherein the organic solvent is at least one selected from the group consisting of tetrahydrofuran, acetonitrile, ethyl acetate and methyl acetate.

4 . The method according to claim 1 , wherein during the removing of the organic solvent the temperature is 60 to 280° C.

5 . The method according to claim 1 , wherein during the heat-treating of the precursor the temperature is 200° C. to 700° C.

6 . The method according to claim 1 , wherein the sulfide-based solid electrolyte contains an LGPS-based solid electrolyte and has peaks at least 2θ=19.90°±0.50°, 20.20°±0.50°, 26.70°±0.50° and 29.20°±0.50° in X-ray diffraction (CuKα: λ=1.5405 Å).

7 . A method for producing a sulfide-based solid electrolyte which comprises:
preparing a homogeneous solution that includes at least elemental lithium (Li), elemental tin (Sn), elemental phosphorus (P) and elemental sulfur (S) in an organic solvent; removing the organic solvent from the homogeneous solution to obtain a precursor; and heat-treating the precursor to obtain the sulfide-based solid electrolyte, wherein the preparing of the homogenous solution comprises: mixing Li 2 S and P 2 S 5 with each other in the organic solvent to prepare an Li—P—S homogeneous solution; preparing an Li—Sn—S homogeneous solution that includes at least elemental lithium (Li), elemental tin (Sn) and elemental sulfur (S) in the organic solvent; mixing Li 2 S and S with each other in the organic solvent to prepare an Li—S homogeneous solution; preparing an Li—Si—S homogeneous solution that includes at least elemental lithium (Li), elemental silicon (Si) and elemental sulfur(S) in the organic solvent; and mixing the Li—P—S homogeneous solution, the Li—Sn—S homogeneous solution, the Li—S homogeneous solution and the Li—Si—S homogeneous solution with each other to prepare the homogeneous solution.

8 . The method according to claim 7 , wherein the preparing of the Li—Si—S homogeneous solution comprises mixing Li 2 S, SiS 2 and S with each other in the organic solvent to prepare the Li—Si—S homogeneous solution.

9 . A method for producing a sulfide-based solid electrolyte which comprises:
preparing a homogeneous solution that includes at least elemental lithium (Li), elemental tin (Sn), elemental phosphorus (P) and elemental sulfur (S) in an organic solvent; removing the organic solvent from the homogeneous solution to obtain a precursor; and heat-treating the precursor to obtain the sulfide-based solid electrolyte, wherein the preparing of the homogenous solution comprises: mixing Li 2 S and P 2 S 5 with each other in the organic solvent to prepare an Li—P—S homogeneous solution; preparing an Li—Sn—S homogeneous solution that includes at least elemental lithium (Li), elemental tin (Sn) and elemental sulfur (S) in the organic solvent; mixing Li 2 S and S with each other in the organic solvent to prepare an Li—S homogeneous solution; and mixing the Li—P—S homogeneous solution, the Li—Sn—S homogeneous solution and the Li—S homogeneous solution with each other to prepare the homogeneous solution.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Ito Tomohiro

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M10/0525

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

• C01P2006/40

  Electric properties · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title