LiFePO4锂离子电池正极材料的电化学性能

被引:15
作者
张宝
罗文斌
李新海
王志兴
机构
[1] 中南大学冶金科学与工程学院
关键词
锂离子电池; 正极材料; 磷酸铁锂; 碳凝胶;
D O I
10.19476/j.ysxb.1004.0609.2005.02.022
中图分类号
TM912.9 [各种材料蓄电池];
学科分类号
摘要
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 1C倍率下放电, 首次放电容量达 143 4mA·h/g, 充放电循环 6次后电容量为142 7mA·h/g, 容量仅衰减 0 7%。
引用
收藏
页码:300 / 304
页数:5
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