LiFePO4/C锂离子电池正极材料的电化学性能

中国有色金属学报, 2005, 15(2): 300-304.

LiFePO4/C锂离子电池正极材料的电化学性能

张宝 ^1, , 罗文斌 ^2, , 李新海 ^3, , 王志兴 ^4,

1.中南大学,冶金科学与工程学院,长沙,410083

2.中南大学,冶金科学与工程学院,长沙,410083

3.中南大学,冶金科学与工程学院,长沙,410083

4.中南大学,冶金科学与工程学院,长沙,410083

基金项目: 国家自然科学基金(50302016)

关键词：锂离子电池 , 正极材料 , 磷酸铁锂 , 碳凝胶

Electrochemical properties of LiFePO4/C for cathode materials of lithium ion batteries

以碳凝胶作为碳添加剂,采用固相法制备了复合型LiFePO4/C锂离子电池正极材料.研究了不同掺碳量对样品性能的影响.利用X射线衍射仪、扫描电镜和碳硫(质量分数)分析方法对所得样品的晶体结构、表面形貌、含碳量进行分析研究.结果表明:样品中的碳含量(质量分数)分别为0%、5%、10%、22%,所得样品均为单一的橄榄石型晶体结构,碳的加入使LiFePO4颗粒粒径减小.另外,碳分散于晶体颗粒之间,增强了颗粒之间的导电性.合成样品的电化学性能测试结果表明,掺碳后的LiFePO4放电比容量和循环性能都得到显著改善.其中,含碳量为22%的LiFePO4/C在0.1 C倍率下放电,首次放电容量达143.4 mA·h/g,充放电循环6次后电容量为142.7 mA·h/g,容量仅衰减0.7%.

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LiFePO4/C锂离子电池正极材料的电化学性能

Electrochemical properties of LiFePO4/C for cathode materials of lithium ion batteries

参考文献