Production method of solid electrolyte

Abstract

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 .- 9 . (canceled) 
     
     
         10 . A method of producing a sulfide-based solid electrolyte comprising:
 contacting an alkali metal sulfide with a sulfur compound without pulverizing by mechanical milling in a mixed solvent of a hydrocarbon solvent and a polar aprotic solvent,   wherein the contacting is carried out at a temperature of 20° C. or higher and 60° C. or lower.   
     
     
         11 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the contacting is carried out at room temperature without heating. 
     
     
         12 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the hydrocarbon solvent comprises one or more selected from hexane, pentane, 2-ethylhexane, heptane, octane, decane, cyclohexane, methylcyclohexane, hexene, heptene, cyclohexene, toluene, xylene, ethylbenzene, decarine, and 1,2,3,4-tetrahydronaphthalene. 
     
     
         13 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the hydrocarbon solvent is an aromatic hydrocarbon solvent. 
     
     
         14 . The method of producing a sulfide-based solid electrolyte according to  claim 13 , 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. 
     
     
         15 . The method of producing a sulfide-based solid electrolyte according to  claim 13 , wherein the aromatic hydrocarbon solvent is toluene, xylene, or ethylbenzene. 
     
     
         16 . The method of producing a sulfide-based solid electrolyte according to  claim 13 , wherein the aromatic hydrocarbon solvent is toluene. 
     
     
         17 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent comprises one or more selected from anisole, diethoxyethane, diethyl ether, tetrahydrofuran, isobutyronitrile, and acetonitrile. 
     
     
         18 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent comprises at least one of an ether solvent and a nitrile solvent. 
     
     
         19 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent is an ether solvent. 
     
     
         20 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent comprises an ether solvent selected from anisole, diethoxyethane, diethyl ether, and tetrahydrofuran. 
     
     
         21 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent is a cyclic ether. 
     
     
         22 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent is tetrahydrofuran. 
     
     
         23 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the polar aprotic solvent is isobutyronitrile or acetonitrile. 
     
     
         24 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein a volume ratio of the hydrocarbon solvent and the polar aprotic solvent (hydrocarbon solvent:polar aprotic solvent) is 95:5 to 5:95. 
     
     
         25 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein the alkali metal sulfide and the sulfur compound are brought into contact at a molar ratio of 74:26 to 76:24. 
     
     
         26 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , wherein contacting the alkali metal sulfide with the sulfur compound comprises contacting the alkali metal sulfide, the sulfur compound, and a halogen compound without pulverizing by mechanical milling. 
     
     
         27 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , further comprising drying a reaction product obtained by contacting the alkali metal sulfide with the sulfur compound to remove the mixed solvent. 
     
     
         28 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , further comprising crystallizing a reaction product obtained by contacting the alkali metal sulfide with the sulfur compound by a heat treatment. 
     
     
         29 . The method of producing a sulfide-based solid electrolyte according to  claim 10 , further comprising drying and crystallizing a reaction product obtained by contacting the alkali metal sulfide with the sulfur compound in one heating step.