Electrochemically active materials as critical components for next-generation solid-state electrolytes

In the traditional view, low reactivity, low electronic conductivity, and high ionic conductivity are necessary for designing advanced solid-state electrolytes. However, this concept limits the range of materials selection and the optimization direction. Recent studies have shown the great potential of electrochemically active materials with mixed conductivity in solid-state electrolytes, exhibiting great ion transport capacity and interface performance. Therefore, it is urgent to re-examine the roles of reactivity and relationships between ionic and electronic conductivity in electrolytes. This perspective aims to clarify the ion-electron transport behavior and decoupling strategies of mixed conductive materials, discuss their contributions to ion transport and interface optimization in solid-state electrolytes, and finally propose innovative directions for designing next-generation solid-state lithium metal batteries.