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采用高温固相法合成了组成为Li(MnxFe1-x)PO4(x=0、0.2、0.4、0.6、0.8、1.0)的锂离子电池正极材料.通过对合成样品的XRD、SEM及电化学性能(循环性能,大电流放电性能)的研究表明,少量Mn的掺杂未影响到LiFePO4的晶体结构,但显著改善了它的电化学性能.Li(Mn0.2 Fe0.8)PO4与LiFePO4材料相比有更好的电化学性能,在低放电倍率(电流密度为20mA/g)时,放电容量为150mAh/g,当放电倍率提高到2C时,放电容量仍可达113mAh/g,且循环性能良好.

参考文献

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