Production method of solid electrolyte
A method of producing a sulfide-based solid electrolyte including bringing an alkali metal sulfide and a sulfur compound into contact in a mixed solvent of a hydrocarbon solvent and a polar aprotic solvent.
1. A method of producing a sulfide-based solid electrolyte comprising:
contacting an alkali metal sulfide with a sulfur compound without pulverizing in a mixed solvent of an aromatic hydrocarbon solvent and a polar aprotic solvent, wherein:
the polar aprotic solvent is at least one of an ether solvent and a nitrile solvent, and a volume ratio of the aromatic hydrocarbon solvent to the polar aprotic solvent (aromatic hydrocarbon solvent: polar aprotic solvent) is 95:5 to 5:95.
2. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the aromatic hydrocarbon solvent is an aromatic hydrocarbon solvent represented by the following formula (1):
Ph-(R) n (1)
wherein Ph is an aromatic hydrocarbon group, R is an alkyl group, and n is an integer selected from 1 to 5.
3. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the polar aprotic solvent is an ether solvent.
4. The method of producing a sulfide-based solid electrolyte according to claim 3 , wherein the alkali metal sulfide is lithium sulfide.
5. The method of producing a sulfide-based solid electrolyte according to claim 4 , wherein the sulfur compound is phosphorous sulfide.
6. The method for producing a sulfide-based solid electrolyte according to claim 4 , wherein the sulfur compound is phosphorous pentasulfide, and the alkali metal sulfide and the sulfur compound are brought into contact at a molar ratio of 74:26 to 76:24.
7. The method for producing a sulfide-based solid electrolyte according to claim 3 , wherein the alkali metal sulfide and the sulfur compound are brought into contact at a molar ratio of 74:26 to 76:24.
8. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the alkali metal sulfide is lithium sulfide.
9. The method of producing a sulfide-based solid electrolyte according to claim 8 , wherein the sulfur compound is phosphorous sulfide.
10. The method for producing a sulfide-based solid electrolyte according to claim 1 , wherein the alkali metal sulfide and the sulfur compound are brought into contact at a molar ratio of 74:26 to 76:24.
11. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the contacting is carried out at a temperature of 20° C. or higher and 60° C. or lower.
12. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the aromatic hydrocarbon solvent is toluene, xylene, or ethylbenzene.
13. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the polar aprotic solvent comprises an ether solvent selected from anisole, diethoxyethane, diethyl ether, and tetrahydrofuran.
14. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the polar aprotic solvent comprises a cyclic ether solvent.
15. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the polar aprotic solvent comprises tetrahydrofuran.
16. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein the polar aprotic solvent comprises isobutyronitrile or acetonitrile.
17. The method of producing a sulfide-based solid electrolyte according to claim 1 , wherein contacting the alkali metal sulfide with the sulfur compound comprises contacting the alkali metal sulfide, the sulfur compound, and a halogen compound.
18. The method of producing a sulfide-based solid electrolyte according to claim 1 , further comprising drying a reaction product obtained by contacting the alkali metal sulfide with the sulfur compound to remove the mixed solvent.
19. The method of producing a sulfide-based solid electrolyte according to claim 1 , further comprising crystallizing a reaction product obtained by contacting the alkali metal sulfide with the sulfur compound by a heat treatment.
20. The method of producing a sulfide-based solid electrolyte according to claim 1 , further comprising drying and crystallizing a reaction product obtained by contacting the alkali metal sulfide with the sulfur compound in one heating step.