Abstract: 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.

Key words: Li4Ti5O12, electrochemical performance