Abstract: The anode material Li₄Ti₅O₁₂ for Li-ion battery was synthesized by high temperature solid-state method,sol-gel method and thermal polymerization method.Its structural characterization,surface morphology and electrochemical performance of products were characterized by X-ray diffractometry,scanning electron microscopy,electrochemical impedance spectroscopy,and galvanostatic charge-discharge test.The result shows that Li₄Ti₅O₁₂ prepared by the three methods had perfect spinel structure.The powders prepared by high temperature solid-state were the biggest,while the powders prepared by sol-gel were the smallest with an average dimension of 200~350 nm and exhibited better electrochemical performance.Its initial specific discharge capacity was 174.5 mAh/g at 0.2 C rate,only reducing 5.7% after 25 cycles.

Key words: Li-ion battery, anode material, Li₄Ti₅O₁₂, high temperature solid-state, sol-gel, thermal polymerization