Rapid Charge–Discharge Property of Li4Ti5O12–TiO2 Nanosheet and Nanotube Composites as Anode Material for Power Lithium-Ion Batteries

Well-defined Li4Ti5O12–TiO2 nanosheet and nanotube composites have been synthesized by a solvothermal process. The combination of in situ generated rutile–TiO2 in Li4Ti5O12 nanosheets or nanotubes is favorable for reducing the electrode polarization, and Li4Ti5O12–TiO2 nanocomposites show faster lithium insertion/extraction kinetics than that of pristine Li4Ti5O12 during cycling. Li4Ti5O12–TiO2 electrodes also display lower charge-transfer resistance and higher lithium diffusion coefficients than pristine Li4Ti5O12. Therefore, Li4Ti5O12–TiO2 electrodes display lower charge-transfer resistance and higher lithium diffusion coefficients. This reveals that the in situ TiO2 modification improves the electronic conductivity and electrochemical activity of the electrode in the local environment, resulting in its relatively higher capacity at high charge–discharge rate. Li4Ti5O12–TiO2 nanocomposite with a Li/Ti ratio of 3.8:5 exhibits the lowest charge-transfer resistance and the highest lithium diffusion coeffic...