The Enhancement Role of ZnO Surface Modification on Electrochemical Performance of Li₄Ti₅O₁₂/ZnO Composites

摘要

Li4Ti5O12/ZnO composites have been synthesized as anode material for lithium ion batteries by amechanical method and the effect of high electronic-conductive ZnO incorporation on theelectrochemical performances of Li4Ti5O12 is investigated systematically by charge/discharge testing,cyclic voltammograms and AC impedance spectroscopy, respectively. In comparison with the pristineLi4Ti5O12, Li4Ti5O12/ZnO demonstrates superior electrochemical performance in wide operationtemperatures, especially at high discharging rates. The analysis of the electrical properties andelectrochemical measurements reveal that Li4Ti5O12/ZnO has much lower charge-transfer resistancesand higher lithium diffusion rate, especially at low temperature.