关键词: 锂离子电池, 负极材料, Li₄Ti₅O₁₂

Abstract: In order to optimize the process of preparing spinel Li₄Ti₅O₁₂，isothermal kinetics for the solid?鄄state reaction between Li₂CO₃ and TiO₂ was investigated by the means of TG，XRD，and SEM etc..Results of the isothermal kinetics revealed that the formation of Li₄Ti₅O₁₂ at 400 ℃ was controlled by the diffusion process，and that at 450 ℃ was controlled by the interface chemical reaction.However，the formation of Li₄Ti₅O₁₂ at 500~600 ℃ was controlled by the random nucleation and growth model，and Avrami equation G（α）=［-ln（1-α）］2 could be used to describe the synthesis kinetics of Li₄Ti₅O₁₂，and the apparent activation energy was 191.35 kJ/mol.Based on the kinetic results，the synthesis process was optimized.The Li₄Ti₅O₁₂ sample prepared at 850 ℃ for 8 h delivered a discharge capacity of 167 mA·h/g with less capacity loss after 25 cycles.

Key words: lithium-ion battery, anode materials, Li₄Ti₅O₁₂