Impacts of precursor solution recipe, processing parameters, and pellet thickness on the lithium ionic conductivity of the ceramic materials with perovskite structure of Li _0.3La _0.57TiO _{2 0.3}La _0.57TiO _{2 0.3}La _0.57TiO ₂2 (i.e., TiO ₂ sol) and then Li+ and La+ were added to the colloidal TiO ₂ was on the order of 10-5 S/cm. It also showed that the temperatures corresponding to a full decomposition for Li _0.3La _0.57TiO ₂ is about 750°C and materials start forming perovskite structure when temperature reaches about 900°C and the lithium ionic conductivity gains about 21% increase when the pellet thickness is reduced to about ¼.