以Fe2O3、NH4H2PO4和H2NCONH2为原料,采用流变相法合成FePO4,探究了温度对其合成过程的影响.以此FePO4为铁源,再采用流变相法制备出正极材料LiFePO4.产物FePO4和LiFePO4的晶型、形貌分别通过XRD和SEM表征,XRD结果表明,FePO4属三斜晶系,具有α-石英结构,而LiFePO4属于斜方晶系,具有橄榄石结构；SEM结果表明,FePO4样品颗粒呈层状分布,LiFePO4晶体形貌为类球形,两者分散度良好,平均粒径均为2μm左右；对所得正极材料LiFePO4进行恒电流充放电测试,其初始放电容量达163.4 mAh/g.采用循环伏安、交流阻抗等对LiFePO4电化学性能表征,结果均显示其电化学性能良好.表明以Fe2O3为原料采用流变相法所得磷酸铁是合成锂离子电池正极材料磷酸铁锂的较理想的铁源.
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