结合溶胶-凝胶和高温固相合成方法成功制备了橄榄石结构的LiMn0.8Fe0.2PO4/C固溶体材料,X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)表征结果表明纳米尺度的LiMn0.8Fe0.2PO4颗粒均匀分散于原位形成的碳导电网络中.将该纳米复合材料用作锂离子电池正极材料时,充放电曲线中除了对应于Fe3+/Fe2+电对的较短平台(～3.5 V vs Li+/Li)外,更高电压的长平台(～4.1 Vvs Li+/Li)对应于LiMn0.8Fe0.2PO4晶格中Mn随Li+脱出嵌入的氧化还原反应,该高的电压平台可明显提高相应锂离子电池的能量密度.此外,使用恒电流间歇滴定技术(GITT)和电化学阻抗谱(EIS)详细研究了LiMn0.8Fe0.2PO4/C电极中锂的化学扩散行为,GITT和EIS所得的锂化学扩散系数DLi分别为5×10-15～ 1×l0-14 cm2/s和1.27× 10-13～2.11× 10-13 cm2/s.研究结果表明,DLi值随测试温度的升高而增加,因此可以通过提高工作温度来改善该类材料的电化学性能.
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