The ionic conductivity and electrochemical intercalation properties of La2/3-xLi3xTiO3 solid solutions were studied, where x was between 0.07 and 0.13. These compounds had a perovskite-type structure, with cation deficiency on the A-sites. Purely ionic conductivity was confirmed, and the mechanism of ionic conduction was investigated by using impedance spectroscopic techniques. It was found that the temperature dependence of the conductivity could be modelled by a Vogel-Tamman-Fulcher type of relationship. In these materials, where a high ionic conductivity was supposed to originate from the presence of vacancies at the A-sites of the perovskite structure, Vogel-Tamman-Fulcher behavior implied a conduction mechanism which involved tilting of the TiO6 octahedra. The intercalation of Li was investigated by means of galvanostatic discharging and charging at very low rates. The Li diffusion coefficient in intercalated material was determined by means of impedance spectroscopy at room temperature, and was found to range from 10-8 to 10-9cm2/s during intercalation.

O.Bohnke, C.Bohnke, J.L.Fourquet: Solid State Ionics, 1996, 91[1-2], 21-31