采用高温固相法合成了Al2O3修饰的Li1+xV3O8自正极材料,用X射线衍射、恒电流充放电实验、循环伏安法等对材料的结构和电化学性能进行了表征.结果表明Al2O3修饰使得Li1+xV3O8材料的层间距离增大,材料的导电性能和电化学反应的可逆性提高.当Al2O3含量为6mol%时,Li1+xV3O8表现出良好的循环性能,首次放电容量达到219mAh/g,10次循环后容量保持率为92.3%.
The cathode material Li1+x V3O8 modified by Al2O3 has been synthesized by solid-state reaction. The structure and electrochemical properties were characterized by X-ray diffraction, galvanostatic charge/discharge experiments and cyclic voltammetry. The results reveal that interlayer distance and electronic conductivity of Li1+xV3O8 has been improved by Al2O3 modification. Li1+x V3O8 contained 6mol % Al2O3 showed excellent cyclic performance. The first discharge capacity was 219mAh/g and the capacity retention rate was 92.3% up to 10 cycles.
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