【摘要】 以Fe2O3和LiH2PO4为原料,聚丙烯为还原剂和碳源,采用一步固相法制备了LiFePO4/C复合正极材料,研究了不同温度对合成材料电化学性能的影响。利用X射线衍射(XRD)、扫描电子显微镜(SEM)等测试手段对合成材料进行了表征,通过恒电流充放电测试研究了材料的电化学性能。结果表明:于700℃下制备的LiFePO4/C复合材料在0.1、1、5C倍率下的首次放电比容量分别为160.4、143.0、108.3 mAh/g。在1 C和5 C经100次循环后,放电比容量分别为138.5 mAh/g和100.2 mAh/g,表现出良好的高倍率循环性能。更多还原

【Abstract】 LiFePO4/C composites were synthesized by one-step solid-state reaction using Fe2O3 and LiH2PO4 as raw materials,and polypropylene as reductive agent and carbon source.The effect of synthesis temperature on the electrochemical performance of the LiFePO4/C composites was studied.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and so on.The electrochemical properties of the samples were investigated by galvanostatic tests.The results show that the sample synthesized at 700 ℃ exhibits a first discharge specific capacity of 160.4,143.0,108.3 mAh/g at 0.1,1 C and 5 C respectively.The sample also exhibits a good rate capability.After 100 cycles at 1 C and 5 C,the specific capacities of 138.5 and 100.2 mAh/g are still maintained.更多还原