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基于β-FeOOH纳米棒制备LiFePO4/C和Fe2O3纳米电极材料及其电池性能

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Abstract:

自制直径为90nm、长为500nm的β-FeOOH纳米棒为前驱物,通过碳热还原法和热分解法分别制备出形貌均匀、粒径为300nm的LiFePO4/C正极材料和粒径为100nm的Fe2O3负极材料,并研究它们对金属锂组成半电池和构造LiFePO4/Cvs.Fe2O3全电池的电化学性能。结果表明LiFePO4/C半电池在0.1C、0.5C、1.0C、5.0C、10.0C和15.0C(1C=170mA?g–1)倍率下放电比容量分别为158.8、153.2、144.3、126.8、111.0mA?h?g–1和92.9mA?h?g–1。经过不同倍率循环后,返回0.1C放电比容量为157.5mA?h?g–1,为初始0.1C放电比容量的99.2%。Fe2O3半电池在50mA?g–1电流密度下首次放电比容量为1655.5mA?h?g–1,循环50次后,仍保持460mA?h?g–1的放电比容量。LiFePO4/Cvs.Fe2O3全电池在0.1C倍率下,相对于LiFePO4活性物质,首次放电比容量为148.7mA?h?g–1;相对于Fe2O3活性物质,首次放电比容量为441.7mA?h?g–1。由LiFePO4/C纳米粒子作为正极材料、Fe2O3纳米粒子作为负极材料组成的全电池在0.1C到2.0C不同倍率下均表现出了良好的循环性能,且返回0.1C后其放电比容量相对于初始0.1C放电比容量无衰减。可见,以β-FeOOH纳米棒为前驱物控制制备的LiFePO4/C正极纳米材料和Fe2O3负极纳米材料可以有效地提升电池的性能。

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