Electronic Conductivity in the Li 4/3 Ti 5/3 O 4 –Li 7/3 Ti 5/3 O 4 System and Variation with State‐of‐Charge as a Li Battery Anode

The electronic conductivity of lithium titanate spinel (Li4/3Ti5/3O4) is measured as a function of lithiation and temperature. The electronic conductivity of fully lithiated spinel (Li7/3Ti5/3O4) is 2.46 S cm−1 at 300 K and is weakly thermally activated. High electronic conductivity is observed over a wide lithiation range down to x~0.04 and suggests that lithium chemical diffusion is ionically limited over most of the state of charge regime.