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电化学  2013 

粒径可控纳米LiFePO4/C的制备及其电化学性能研究

DOI: 10.13208/j.electrochem.130362, PP. 550-557

Keywords: LiFePO4,锂离子电池,正极材料,原位合成

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Abstract:

LiFePO4电极的倍率特性与材料的粒度和电子导电性有很大关系.采用共沉淀方法,调控预处理温度,将3种不同尺寸的FePO4前驱体通过表面修饰对-羟基苯甲酸的聚合物,可合成不同尺度的LiFePO4/C材料,分别为80nm、200nm和1μm.纳米尺度LiFePO4-a/C电极,30C放电比容量达到了100mAh·g-1,而微米级LiFePO4-c/C电极放电比容量仅为54mAh·g-1.均一碳包覆的LiFePO4/C电极表现出强抗氧化性,不仅提高其导电性,还可防止材料氧化.

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