Electrochemical behaviour of LiCr1−xAlxTiO4 (0≤x≤0.4)

The electrochemical behaviour in lithium cells of the spinel oxides Li1+yCr1−xAlxTiO4 is reported. This behaviour is based on the structural features and the electrical conductivity of these phases. The mobile Li+ cations are located on tetrahedral 8a sites and the remaining cations (Cr, Al, Ti) on the octahedral 16d ones, and the host materials successfully undergo reversible Li intercalation at 1.5 V, which is attributed to the pair Ti4+/Ti3+. The inclusion of Al3+ in the spinel structure enhances the electrochemical stability of these materials upon cycling although the specific capacity is lowered.