High-Speed Deposited Amorphous Li-B-W-O Thin Film Electrolytes for All-Solid-State Batteries

Abstract

Amorphous Li-B-W-O (LBWO) thin film electrolytes synthesized from Li2O-B2O3-LiWO4 composite sources were investigated; these were deposited by a high-speed thermal evaporation using Li2O-B2O3-LiWO4 composite materials with varied Li quantities for use in solid-state batteries. The thin film electrolytes have a maximum ionic conductivity of 3.65 x 10(-6) S/cm. The ionic conductivity increased with increasing lithium content in the LBWO thin films. This increased lithium content can produce a greater number of free lithium ions located in mobile sites, enhancing conductivity. It was demonstrated that the LBWO thin film electrolyte produced using the high-speed deposition could play a superior role as a solid electrolyte for all-solid-state batteries (ASSBs).