尖晶石型Li4Ti5O12的制备与性能分析

采用高温固相法和溶胶凝胶法合成了锂离子电池负极材料尖晶石型Li4Ti5O12。用XRD、SEM、循环伏安、电化学阻抗图谱、恒流充放电测试研究了材料的晶体结构和电化学性能。结果表明:所制备的材料Li4Ti5O12均具有良好的尖晶石型结构,其中草酸与钛酸四丁酯物质的量比为1.0时Li4Ti5O12电化学性能最佳,以0.5C的倍率循环充放电,首次放电比容量可达到140.82mAh/g,50次循环后放电比容量仍保持在120.06mAh/g,保持率为85.26%。

Study on the preparation and performance of spinel Li4Ti5O12

The anode materials spinel Li4Ti5O12 for Li-ion battery were synthesized by high temperature solid-state method and sol-gel method. The crystal structure and electrochemical performance of the materials were studied by XRD,SEM, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge tests. The results showed that the anode materials Li4Ti5O12 had perfect spinel structure. When the chemical mol ratio of C2H2O4 ·2H2O and C6H36O4 Ti was 1.0, the material Li4Ti5O12 exhibited the best electrochemical performance, and when the battery was cycled at 0.5 C, the first discharge specific capacity was 140.82 mAh/g. After 50 cycles, the discharge specific capacity was 120.06 mAh/g and the capacity retention was above 85.26%.