LiFePO_4/C复合材料的合成及其电化学性能

Preparation and Electrochemical Performance of LiFePO_4/C Composite

采用柳絮为碳源和模板,通过蒸发自组装合成LiFePO_4/C复合材料。柳絮的添加量对复合材料的形貌影响较明显,当柳絮添加量为5%时,材料的形貌完整,柳絮碳上均匀覆盖着LiFePO_4纳米线。复合材料在0.1C倍率下放电比容量最高,为141mA·h/g,倍率为1C时,放电容量达到130mA·h/g以上,循环600周后,容量保持率在95%以上。

LiFePO_4/C composites were synthesized by evaporative self-assembly using catkins as carbon source and template. The adding quantity of catkins in composite material has an obvious influence on their morphology. When 5% catkins are applied, the composite material exhibits perfect morphology, and catkin carbon is evenly covered by LiFePO_4 nanowires. The composite delivers the highest discharge capacity of 141 m A·h/g at 0.1C rate, the discharge capacity under 1 C rate reaches 130 m A·h/g,the capacity retention was above 95% after 600 cycles.