用共沉淀法合成了富锂正极材料Li[Li0.2Mn0.4Fe0.4]O2,并对其表面进行Al2O3包覆.采用XRD、SEM和电化学测试等方法对样品进行表征.结果表明,与Li[Li0.2Mn0.4Fe0.4]O2相比,包覆改性后的Li[Li0.2Mn0.4Fe0.4]O2具有较好的电化学性能,其初始放电容量未明显降低,而循环寿命大大提高,4.0％Al2 O3包覆处理的富锂正极材料经50次充放电循环后,容量衰减量在9％左右.
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