中文摘要：

本文通过乙酸锂与二氧化钛反应，采用一步高温固相法在不同反应温度（750℃／800℃／850℃）和反应气氛（氮气／空气）下合成Li4Ti5O12材料．通过热重分析、X射线衍射、扫描电子显微镜、循环伏安曲线和充放电曲线分析了LiaTi5O12的晶体结构，观察其微观形貌，并测试其电化学性能．结果表明，800℃氮气烧结得到的Li4Ti5O2（L-800N）材料粒径较小，该材料在1．0C倍率下的首周期放电比容量达到170．7mAh·g^-1，100周期循环后的容量保持率高达94．6％，即使是10C高倍率其首周期放电容量依然有143．0mAh·g^-1，表现出了良好的倍率和循环寿命性能．

英文摘要：

Series of spinel lithium titanate（Li4Ti5O12） materials were synthesized by one-step solid-state reaction using lithium acetate and Ti O2 as raw materials under different temperatures（750/800/850oC） and atmospheres（N2/air）. The as-prepared Li4Ti5O12 materials were investigated by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, cyclic voltammotry and charge-discharge test to analyze their crystal structures, microstructures and electrochemical performances. The results show that the Li4Ti5O12（L-800N）material obtained at 800 oC under nitrogen atmosphere exhibited better electrochemical performance and smaller particle size. The initial discharge specific capacity of the optimized Li4Ti5O12 reached 170.7 m Ah·g-1at 1.0C with the capacity retention of 94.6% after 100 cycles. Even at the current density of 10 C, the initial discharge specific capacity of 143.0 m Ah·g-1could be achieved, which demonstrated good high-rate and cycling performances.