Characteristics of lithium-ion-conducting composite polymer-glass secondary cell electrolytes

A family of lithium-ion-conducting composite polymer-glass electrolytes containing the glass composition 14Li2O–9Al2O3–38TiO2–39P2O5 (abbreviated as (LiAlTiP)xOy) with high ionic conductivity, an excellent electrochemical stability range, and high compatibility with lithium insertion anodes is described. An optimized composition has a room temperature conductivity of 1.7×10−4 S cm−1, an Li+ transference number of 0.39, and an electrochemical stability window to +5.1 V versus Li/Li+. It also has good interfacial stability under both open-circuit and lithium metal plating–stripping conditions and provides good shelf-life.