The structure, lithium ion conductivity and reaction suppression against Li anode of the LaAlO₃-La_0.57Li_0.3TiO₃ solid solution

The structure, lithium ion conductivity and reaction suppression against lithium of the novel xLaAlO₃-(1 - x)La_0.57Li_0.30TiO₃ oxides (0 ≤ x ≤ 1) with a perovskite related structure (ABO₃) are studied by using X-ray diffraction, ac impedance and digital multimeter. The results show that owing to the geometric environment, consisting of La³⁺, Li⁺ and vacancy at A-sites, the conductivities from x = 0 to 20 mol% are maintained in the range of 10^-4 S cm^-1, and decrease to 8.92 × 10^-9 S cm^-1 with 30-40 mol% LaAlO₃ addition. When the value of x is larger than 50 mol%, the corresponding oxides no longer have the characteristic of ionic conduction. A stable solid electrolyte is also observed to alleviate the reaction significantly when the incorporated LaAlO₃ content is 40 mol%.