Corresponding Author

Zhou-Guang LU(luzg@sustech.edu.cn)


Anode Material Li4Ti5O12 for lithium-ion batteries was successfully prepared using half-solid-state method. Furthermore, carbon coating modification of Li4Ti5O12 was also carried out. The phase structure and morphology were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). The electrochemical properties were investigated by constant current discharge-charge tests, cyclic voltammetry and electrochemical impedance techniques. The results indicated that the electrochemical performance of Li4Ti5O12 without modification declined seriously due to the aggregation of Li4Ti5O12 particles. The initial discharge capacities were only 121.7 mAh.g-1 at a rate of 0.1C and 87.6 mAh.g-1 at a rate of 0.5C, respectively. By means of carbon coating modification, the as-synthesized composite Li4Ti5O12/C kept the spherical morphology and showed no pronounced aggregation. At the charge-discharge rates less than 0.5C, the special capacities of Li4Ti5O12/C were always larger than 180mAh.g-1 during cycling,exceeding the theoretical capacity of 175 mAh.g-1 for Li4Ti5O12. Moreover, the modified product exhibited high rate capacities of 136, 79.9 and 58.3 mAh.g-1 at 1, 5 and 10C, respectively. All these results indicated that the carbon coating modification greatly enhanced the electrochemical performance of the product, which displayed excellent cycling stability as well as high rate performance.

Graphical Abstract


half-solid-state method, Li4Ti5O12, carbon coating, lithium-ion battery

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