SOLID ELECTROLYTE MATERIAL AND BATTERY USING SAME

The present disclosure provides a solid-electrolyte material having a high ionic conductivity. A solid-electrolyte material according to the present disclosure includes a crystal phase constituted by Li, M, X, and O. M is at least one element selected from the group consisting of Mg, Ca, and Sr. X is at least two elements selected from the group consisting of F, CI, Br, and I.