新型锂离子电池负极材料Li_(1.1)VO_2的合成和电化学性能

Synthesis and Electrochemical Performance of Lithium-Ion Battery Anode Materials of Li_(1.1)VO_2

采用高温固相反应法合成了新型锂离子电池负极材料Li1.1VO2。用X射线衍射仪、扫描电子显微镜和恒电流充放电法研究了不同温度下合成的Li1.1VO2试样的结构、形貌和电化学性能。实验结果表明:1 100℃下合成的Li1.1VO2试样结构完整、颗粒大小均匀,具有最佳的电化学性能。在0.1C、1C倍率下,放电容量分别为313.2,210.5 mA.h/g;在1C倍率下,经过50次循环后,放电容量保持率高达95.45%。

New Li1.1VO2 anode materials were synthesized successfully by high temperature solid-state reaction.The microstructure,morphology and electrochemical performance of Li1.1VO2 synthesized under various temperature were investigated by X-ray diffraction,scanning electron microscopic and galvanostatic charge and discharge tests.The experimental results show that Li1.1VO2 synthesized at 1 100 ℃ possesses perfect microstructure,uniform grains and the best electrochemical performance.The discharge capacities are 313.2 and 210.5 mA·h/g at 0.1 C and 1 C,respectively.The retention of discharge capacity is 94.45% at 1C rate after 50 cycles.