New lithium ion conductor, thio-LISICON lithium zirconium sulfide system

A new lithium ion conductor, thio-LISICON (LIthium SuperIonic CONductor), Li2ZrS3 was synthesized by solid state reaction. It has the lithium ion conductivity of 7.3 × 10− 6 S cm− 1 at 30 °C. Its conductivity were successfully improved by introducing interstitial lithium ions with Zr4+ partially substituted by Zn2+ (Li2 + 2xZnxZr1 − xS3; x = 0, 0.05, 0.1, 0.2, 0.4). The optimum x value for introducing the highest content of interstitial lithium ions was found to be 0.1. And the highest ionic conductivity at 30 °C was reached to be 1.2 × 10− 4 S cm− 1.