The Li-ion conductivity and electrochemical stability of the perovskite, La2/3-xLi3xO3, were determined by using alternating-current impedance spectroscopy, cyclic voltammetry and galvanostatic cycling. The ionic conductivity of La0.55Li0.35TiO3 and La0.57Li0.29TiO3 pellets which were sintered from 4 different powders was measured at 30 to 110C. The bulk conductivity was found to be closely related to the calcination temperature of the powders. Pellets which were derived from 1100C-calcined powders had a higher bulk conductivity than did those derived from 1200C-calcined powders. The grain-boundary conductivity was governed mainly by the sample composition. The activation energies ranged from 0.14 to 0.18eV for bulk conduction and from 0.41 to 0.43eV for grain-boundary conduction.

Ionic Conductivity, Lithium Insertion and Extraction of Lanthanum Lithium Titanate. C.H.Chen, K.Amine: Solid State Ionics, 2001, 144[1-2], 51-7