Ion Conductivity of Li_0.5+XLa_0.5TiO₃ Materials for Li-Ion Solid Electrolyte

Abstract

The practical application of Li0.5+xLa0.5TiO3(LLTO) perovskite structural materials is limited by its low total conductivity. In order to improve the ionic conductivity, different ratios of Li-doping material were investigated in this study. LLTO materials were synthesized by the solid-state reaction method. From XRD pattern results, with increasing the ratio of Li/La to 1.6, the structure of the Li0.8La0.5TiO3 material was starting to change from complete perovskite structure to partial Ruddlesden–Popper perovskite structure. Also, the ohmic resistance of the LLTO materials decreased with the ratios of Li/La from 1 to 1.5. As the ratios of Li/La were larger than 1.6, the ohmic resistance would increase because of the structure change.