SULFIDE SOLID ELECTROLYTE COMPOSITION, ELECTRODE MIXTURE CONTAINING SAME, AND METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE COMPOSITION

Provided are a sulfide solid electrolyte composition containing a sulfide solid electrolyte and red phosphorus, having an excellent flame retardancy and a high ionic conductivity and further having excellent hydrogen sulfide generation suppressing performance; an electrode mixture containing the composition; and a method for producing a sulfide solid electrolyte composition including mixing a sulfide solid electrolyte and red phosphorus.