以Fe2O3为铁源,采用高温固相法制备了Y3＋掺杂的LiFePO4/C复合材料。利用TG-DSC、XRD、SEM、恒电流充放电等手段对材料的合成反应历程、粉体颗粒形貌以及电化学性能进行了研究。结果表明：Fe3＋在300～550℃间被还原为Fe2＋,经过650℃煅烧后,形成晶型单一的橄榄石结构晶体。LiFe0.98Y0.02PO4/C样品在0.2 C倍率下的首次放电比容量达到了151.6 mA.h/g。
Y3+-doped LiFePO4/C composite material was prepared by a solid-state synthesis method using Fe2O3 as starting material.The reaction processes,morphology of powders and electrochemical performance of samples were studied by TG-DSC,XRD,SEM and constant current charge-discharge method.The results show that the Fe3+ is reduced to Fe2+ at 300-550 ℃,and the composites synthesized at 650 ℃ exhibit olivine structure.Its initial discharge capacity is 151.6 mA·h /g at 0.2 C rate.
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