Synthesis and Electrochemical Performance of Spinel Li4Ti5O12 Electrode Material
尖晶石型 Li4Ti5O12电极材料的合成与电化学性能研究

Spinel lithium titanium composite oxides (Li4Ti5O12) were synthesized by three methods. The effects of the synthesis conditions on the properties of as-synthesized cathode materials were investigated. The crystal structure and the electrochemical performance were characterized by XRD, SEM, LSD, CV, AC impedance and galvanostatically charge-discharge experiments. The results demonstrated that pure Li4Ti5O12 powders could be prepared in short time by using organic solvent. Glucose was added to improve the conductivity of Li4Ti5O12, and the powders showed a good lithiumation performance. The reversible capacity of the material, more than 160mAh·g-1, was delivered at room temperature and 0.2C rate, and the charge-discharge efficiency was almost 100%. After 44 cycles, there was no obvious capacity fade. The charge and discharge results of Li4Ti5O12/LiFePO4 indicated that Li4Ti5O12 was a good candidate material of negative electrode for lithium-ion battery.