Li ion conduction in new perovskite-related sintered oxides

The structure and ionically conductive properties of the sintered oxide of the system Li2O–TiO2–MO (M=Sr, Ba) were investigated in detail. A new orthorhombic perovskite-related type phase was discovered in the sample having the composition of 15 mol% Li2O, 75 mol% TiO2 and 10 mol% MO (M=Sr, Ba). The conductivities of (Li2O)0.15(TiO2)0.75(SrO)0.10 and (Li2O)0.15(TiO2)0.75(BaO)0.10 at 300 °C were 6×10−3 and 2.5×10−3 S cm−1, and the activation energies for conduction were 0.29 and 0.39 eV, respectively. Li ion conduction in them was confirmed by electrochemical experiments.