KINETICS OF ELECTROCHEMICAL LITHIUM INTERCALATION INTO NB2O5 AS AN ELECTRODE MATERIAL FOR SECONDARY LITHIUM BATTERIES

The kinetic study of the intercalation process of lithium ions into the structure of Nb2O5 with T-type modification was made using an ac impedance method. The chemical diffusion coefficients, D, of lithium in the oxide were measured as functions of the lithium composition and temperature by using several kinds of electrolytes. The obtained values of D strongly depended on the lithium composition and the kind of electrolytes. Furthermore, the lithium component diffusion coefficient and activation energy for lithium diffusion were calculated.