Enhancement of ionic conductivity and fracture toughness by infiltrating porous Li0.33La0.56TiO3 pellets

Although solid-state lithium electrolytes have the potential to reduce the safety issues associated with organic liquid electrolytes, disadvantages such as low total conductivity, large interface impedance, and delamination of the interface due to cyclic stress still need to be addressed. The solid-state lithium -ion conductor Li0.33La0.56TiO3 (LLTO) was prepared via a hydrothermal route by using CTAB as templates in this paper. Perovskite LLTO with micro -porous channels was obtained and the total conductivity is comparable to the non -porous LLTO. Porous LLTO pellets are infiltrated with the non -porous LLTO precursor solution, and the total conductivities of the infiltrated porous LLTO are all higher than those without infiltration. After infiltration, the porous LLTO calcined at 600 degrees C achieves the highest total conductivity, 7.88 x 10-5 S/cm. The fracture toughness of the infiltrated LLTO is higher than that of the non -porous LLTO. The results demonstrate a new way to prepare solid-state lithium -ion conductors with high ionic conductivity and great tolerance to cyclic stress. (c) 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.