用廉价三价铁离子化合物为铁源,聚丙烯作还原剂和碳源,两步固相法合成F掺杂原位碳包覆LiFePO4正极材料.结果表明,合成产物具有完整的橄榄石型LiFePO4晶体结构,粉末形状近似球形,尺寸分布在50～200nm范围内,两步固相法更好地抑制了LiFePO4晶粒的长大.电化学测试结果表明,F掺杂提高了材料倍率放电性能,有效降低了材料电极的极化.在1C,2C,3C(C为150mA/g)充放电倍率下,LiFePO3.98F0.02/C的比容量分别为146mAh/g,137mAh/g,122mAh/g,1C循环55次后放电容量达到初始容量的99.3%.
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