Synthesis and Performance Research of Li4Ti5O12/CNTs Anode Materials

Li4Ti5O12/CNTs composite was prepared by one-step solid state method directly and the properties for the samples with different contents of CNTs were also compared at the same time. The crystal phase and morphology of the materials were characterized by XRD and SEM, respectively. Electrochemical properties were measured by charge and discharge test, AC impedance and cyclic voltammetry. It can be found from the microstructure that the diameter of particles around CNTs was smaller than the ones far from CNTs. The results indicated the doping amount is not the more the better, and that the sample doped with 5% CNTs could improve the conductivity better because of its effective "conductivity bridge". The capacity of the first cycle and the twentieth cycle were 154.8 mAh/g, 150.3 mAh/g at 0.5C, and the capacity retention was 97.1%.