Dynamics of Li Atom in Solid Ionic Conductors: LiAlGeO4 and Amorphous Li2Si2O5

The lithium battery research is progressively increasing to make the batteries lighter, quickly chargeable, safer, long liver, stable and cost effective. The ab-initio calculated activation energy for diffusion of Li in LiAlGeO4 is reported to be about 0.11 eV (0.30 eV for LiAlSiO4). So it is expected to have higher ionic conductivity and lower conduction temperature than that of LiAlSiO4. Amorphous phase of Li2Si2O5 is found to transform to crystalline form above 893 K. This transition might be related to mode of Li-ion diffusion in amorphous phase of Li2Si2O5. The QENS data on LiAlGeO4 and amorphous Li2Si2O5 would be useful to get the microscopic knowledge of the dynamics of lithium atoms, nature of diffusion, jump length, and the corresponding activation energy. These studies would be very useful in future applicability of these compounds in industries.