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铁掺杂对磷酸锰锂电化学性能的影响

DOI: 10.7521/j.issn.0454-5648.2014.02.12

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Abstract:

利用球磨-固相烧结法制备出一系列不同铁掺杂量的LiMn(1-x)FexPO4(x=0~1.0)材料,并利用X射线衍射、扫描电子显微镜对所得样品结构和形貌进行表征。以所得材料为锂二次电池正极组装电池,并运用恒流充放电、循环伏安对其电化学性能进行测试。结果表明所得LiMn(1-x)FexPO4材料均呈现单一均相橄榄石结构;其粒径为50~100nm,粒径分布均匀。未经铁掺杂的LiMnPO4比容量仅为19.3mA·h/g,比能量仅为71.20mW·h/g,经铁掺杂后材料的比容量和比能量都获得显著提高,当x=0.4时,LiMn0.6Fe0.4PO4的比容量为133.6mA·h/g,比能量达到483.58mW·h/g。比容量和比能量随着铁掺杂量的提高而产生的增量分别符合指数递减和倒S型曲线。

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