Synthesis and Electrochemical Properties of Solid Lithium Ion Conductors in Li_(4+x)Al_xSi_(1-x)S_4 System

摘要

Lithium conducting solids with high ionic conductivity attract much attention as solid electrolytes for developing all-solid-state batteries [1]. However, searching for novel materials is still necessary to satisfy the strict demands of practical electrochemical devices such as electrochemical/chemical stability, low cost, and low toxicity. This study systematically investigates the synthesis and electrochemical properties of solid lithium ion conductors in the Li_(4+x)Al_xSi_(1-x)S_4 system. The relationship of ionic conductivity, thermal stability, and phase-types in the binary Li_5AlS_4-Li_4SiS_4 system is elucidated.