HALIDE SOLID ELECTROLYTE MATERIAL AND BATTERY USING SAME

A halide solid electrolyte material according to the present disclosure is represented by the chemical formula Li6-(4+a)b(Zr1-aMa)bX6, wherein M denotes at least one element selected from the group consisting of Ta and Nb, X denotes a halogen element, and two mathematical formulae 0 < a < 1 and 0 < b < 1.5 are satisfied.