微量Mn掺杂LiFePO/C材料的低温电化学性能

被引：3

作者：

曾令杰

龚强

廖小珍

何理

何雨石

马紫峰

机构：

[1] 上海交通大学化学化工学院化学工程系,电化学与能源技术研究所

来源：

科学通报 | 2010年 / Z2期

关键词：

磷酸铁锂; 锂离子电池; 锰离子掺杂; 低温性能;

D O I：

暂无

中图分类号：

TM912 [蓄电池];

学科分类号：

摘要：

通过Mn掺杂显著提高了LiFePO4/C材料的低温电化学性能.微量Mn掺杂的LiFe0.98Mn0.02PO4/C材料在0℃时以1C放电容量达到其在20℃时放电容量的95%,而LiFePO4/C材料相应只达到85%.LiFe0.98Mn0.02PO4/C材料在–20℃以不同倍率放电时容量分别为124.4mA·h·g–1(0.1C),99.8mA·h·g–1(1C),80.7mA·h·g–1(2C)和70mA·h·g–1(5C);相对于LiFePO4/C材料的120.5mA·h·g–1(0.1C),90.7mA·h·g–1(1C),70.4mA·h·g–1(2C)和52.2mA·h·g–1(5C)有明显提高.循环伏安测试表明,微量Mn掺杂提高了Li+在LiFePO4晶格中的嵌入-脱出能力.电导率测量和场发射扫描电子显微镜观察显示微量Mn掺杂不仅使LiFePO4材料本体电导率提高,还使获得的LiFe0.98Mn0.02PO4/C材料晶粒细化,从而使材料的电化学嵌脱锂能力显著提高.

引用

页码：2648 / 2652

页数：5

共 7 条

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