Study on the Properties of LiTaSiO5-based Lithium Ion Conductors Doped by Acceptors

Abstract

Lithium-ion conductor plays an important role in the all-solid-state batteries. In this paper, the novel sphene structure LiTaSiO5 lithium-ion conductor material was taken as the research object. The lithium ion concentration can be changed by the acceptor doping of titanium ions. And further, the electrical properties of LiTaSiO5 lithium-ion conductor can be enhanced. Through the AC impedance spectroscopy measurement, the ion conductivity of Li1.1Ta0.9Ti0.1SiO5 sample can reach 1.93×10-5 S/cm at 333 K, which is higher than that of the parent LiTaSiO5 material at the same conditions. Combined with the results of dielectric relaxation spectroscopy, the higher ionic conductivity may be derived from the higher mobile lithium ion concentration in the Li1.1Ta0.9Ti0.1SiO5 compound. The research results have very important theoretical value for the research and design of new sphene-structure lithium-ion conductors.