Effects of B-site Ion(Al, Cr) Substitution on the Ionic Conductivity of

The effect of B-Site aliovalent ion (Al, Cr) substitution on the ionic conductivity of Li3xLa2/3-xTiO3 was investigated. The results show that partial substitution of smaller Al3+ for Ti4+ is effective to enhance the ionic conductivity of Li3xLa2/3-xTiO3. At 300K, the maximum bulk conductivity of (1.58±0.01) × 10-3S·cm-1 observed from the composition of (Li0.39La0.54)1+y/2 AlyTi1-yO3 with y=0.02(x=0.13), is the highest yet reported for known perovskite solutions at room temperature. The conductivity enhancement is due to the substitution-induced bond strength change rather than due to bottleneck size change for Li migration, TiO6-octahedron tilting or A-site cation ordering.