A solid lithium superionic conductor Li11AlP2S12 with a thio-LISICON analogous structure

Abstract

A solid lithium superionic conductor Li₁₁AlP₂S₁₂ with a thio-LISICON analogous structure has been synthesized for the first time by sintering at 500 °C (LAlPS₅₀₀). Such a pure lithium ionic conductor shows a conductivity of 8.02 × 10⁻⁴ S cm⁻¹ at 25 °C, a low E_a of 25.4 kJ mol⁻¹, and a wide electrochemical voltage window of higher than 5.0 V (vs. Li⁺/Li). This facilitation of Li ionic conduction suggests the potential application in solid lithium ion batteries.