Abstract:The Li₄Ti₅O₁₂ material was prepared by solid-state method with Li₂TiO₃ and TiO₂ as the source of titanium and lithium. The crystalline structure，morphology and electrochemical performances of the samples were investigated by X-ray diffraction, scanning electron microscope and charge discharge test, and the growing regularity of primary particles and the reaction mechanism were studied at the same time. The results show that Li₂TiO₃ is an intermediate product for traditional method, pure Li₄Ti₅O₁₂ materials are prepared at 720 and 750 ℃ for 10 h using Li₂TiO₃ as raw material, and the sizes of prepared fine primary particles are 270 and 278 nm, respectively, which are smaller than those using Li₂CO₃ and TiO₂ as raw materials, and the temperature of pure phase Li₄Ti₅O₁₂ obtained is lower. With increasing conversion of reaction, the size of primary particles increases rapidly, then increases slowly after the reaction finishes. The initial specific discharge capacities of Li₄Ti50₁₂ synthesized at 750 ℃ and the charge-discharge rate of 0.1C, 1C, 5C and 9C are 171, 164, 149 and 126.7 mA？h/g, respectively. After 200 cycles at 0.1C, it remains more than 97% of the initial specific discharge capacity, exhibiting excellent electrochemical performance.

Key words: Li₂TiO₃; Li₄Ti₅O₁₂; solid-state method; electrochemical performance