新型固相法制备高性能LiFePO4正极材料

功能材料, 2008, 39(10): 1677-1680.

新型固相法制备高性能LiFePO4正极材料

王志国 ^1, , 彭文杰 ^2, , 王志兴 ^3, , 郭华军 ^4, , 李新海 ^5,

1.中南大学,冶金科学与工程学院,湖南,长沙,410083

2.中南大学,冶金科学与工程学院,湖南,长沙,410083

3.中南大学,冶金科学与工程学院,湖南,长沙,410083

4.中南大学,冶金科学与工程学院,湖南,长沙,410083

5.中南大学,冶金科学与工程学院,湖南,长沙,410083

基金项目: 国家重点基础研究发展计划(973计划)(2007CB613607)

关键词： LiFePO4 , 正极材料 , 机械活化 , 烧结

LiFePO4 cathode materials with enhanced performance prepared by a novel solid-state method

以FeC2O4·2H2O和LiH2PO4为原料,经过两步机械活化后在惰性气氛中经高温烧结,合成出LiFePO4正极材料.研究了合成温度与反应时间对材料性能的影响.采用X射线衍射仪和扫描电镜分析样品的晶体结构和表面形貌,结果表明,600℃下烧结18h合成的样品具有规则的橄榄石型结构.样品的电化学性能良好,在室温下以0.1C倍率充放电,首次放电比容量可达到155.6mAh/g,为其理论容量的91.53%,且循环50次后比容量仅衰减4.11%,采用1C倍率放电时,首次放电比容量达到149.3mAh/g.

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新型固相法制备高性能LiFePO4正极材料

LiFePO4 cathode materials with enhanced performance prepared by a novel solid-state method

参考文献