镁离子掺杂对磷酸铁锂结构和性能的影响

功能材料, 2006, 37(12): 1942-1945.

镁离子掺杂对磷酸铁锂结构和性能的影响

张培新 ^1, , 文衍宣 ^2, , 刘剑洪 ^3, , 许启明 ^4, , 任祥忠 ^5, , 张黔玲 ^6,

1.西安建筑科技大学,材料科学与工程学院,陕西,西安,710055;深圳大学,化学与化工学院,广东,深圳,518060

2.广西大学,化学化工学院,广西,南宁,530004

3.深圳大学,化学与化工学院,广东,深圳,518060

4.西安建筑科技大学,材料科学与工程学院,陕西,西安,710055

5.深圳大学,化学与化工学院,广东,深圳,518060

6.深圳大学,化学与化工学院,广东,深圳,518060

基金项目: 广东省深圳市科技计划(200505) 国家自然科学基金(50474092)

关键词：锂离子电池 , 正极材料 , LiFePO4 , 镁掺杂

Performance and structure of Mg2+ doped lithium iron phosphate prepared by chemical precipitation methode

为提高LiFePO4的充放电性能,用化学沉淀法制备了镁离子掺杂的磷酸铁锂,用电化学方法测量了Li1-xMgxFePO4(x=0.00、0.02、0.05、0.07、0.10和0.20,摩尔分数)的充放电性能,用X射线衍射(XRD)和里特沃尔特(Rietveld)方法表征了掺杂对LiFePO4的晶体结构的影响.结果表明少量镁离子掺杂能有效地提高LiFePO4的比容量和循环性能,其中Li0.95Mg0.05FePO4具有更好的电化学性能,放电比容量高出LiFePO4约20mAh/g,镁离子掺杂提高了LiFePO4中Fe3+/Fe2+共存态的浓度,使材料具有更好的导电能力.

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