用两种碳源制备高性能LiFePO4/C正极材料

被引:13
作者
赖春艳
赵家昌
解晶莹
机构
[1] 中国科学院上海微系统与信息技术研究所
关键词
锂离子电池; LiFePO4/C正极材料; 两种碳源; 包覆;
D O I
暂无
中图分类号
TM912 [蓄电池];
学科分类号
0808 ;
摘要
为了提高LiFePO4材料的电化学性能,以碳溶胶和葡萄糖两种物质为碳源、采用高温固相法制备了LiFePO4/C复合正极材料。通过XRD、TEM、恒电流充放电等方法研究了材料的结构与电化学性能。XRD结果表明,两种碳源的添加对LiFePO4的晶体结构没有影响。从TEM图上可观测到颗粒外部明显的碳包覆层。电化学性能测试表明,在同样倍率下,以两种碳源制备的LiFePO4/C材料放电比容量高于以单一碳源制备的LiFePO4/C,且表现出优良倍率性能和循环稳定性:在0.1C下的放电比容量达162mAh/g,1C下放电比容量为157mAh/g,循环20次后容量没有任何衰减。
引用
收藏
页码:484 / 488
页数:5
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