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正极材料LiFe1–xNixPO4/C的合成及性能

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Abstract:

以H3PO4、FeSO4?7H2O和LiOH?H2O为原料,采用水热法以Ni(CH3COO)2?4H2O为镍源、葡萄糖为碳源,合成锂离子电池正极材料LiFe1–xNixPO4/C(x=0,0.02,0.05,0.08)。采用X射线衍射、扫描电子显微镜对材料晶体结构和表观形貌进行表征,利用充放电测试技术对其电化学性能进行测定。结果表明掺杂适量的Ni2+可以减小材料的晶胞体积,提高材料的比电容和循环性能。当Ni2+的掺杂量为5.0%时,LiFe0.95Ni0.05PO4/C材料在0.1C倍率下的首次放电比电容可达到152.8mA?h/g,经过20次循环后的比电容保持率在97.5%以上。

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