Mg^(2+)掺杂的LiFePO_4材料的共沉淀合成与表征  

Synthesis of Mg^(2+) Doped Lithium Iron Phosphate by Co-precipitation

作　　者：张俊喜[1] 曹小卫[1] 许明玉[1] 徐娜[1] 宋启云[1] 颜立成[2] 

机构地区：[1]上海电力学院能源与环境工程学院,上海200090 [2]杭州师范大学教务处,浙江杭州310036

出　　处：《上海电力学院学报》2009年第6期547-551,共5页Journal of Shanghai University of Electric Power

基　　金：教育部科学技术研究重点项目(205055);中国航天科工集团支撑技术基金项目(DL01-2004);上海市能力建设项目(DL2009)

摘　　要：提出了一种采用共沉淀法合成镁掺杂的锂离子正极材料LiFePO4的新方法,研究了合成条件,采用XRD,SEM,循环伏安测定,电化学阻抗谱分析,以及充放电测试对合成的材料作了表征分析.结果表明,采用共沉淀合成方法可以获得性能良好的LiFePO4;Mg2+掺杂对LiFePO4结构没有产生明显的影响,但掺杂量的大小对LiFePO4的放电性能有较大影响.A new synthesis route of Mg^2＋ doped LiFePO4 is proposed. The samples are characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, and their electrochemical properties are investigated by using charge-discharge curve and electrochemical measurement technology （ cyclic vohammetry （ CV ） and electrochemical impedance spectroscopy （EIS） ）. Results show that the co-precipitation process allows the homogeneous mixing of the ingredient at atomic level, the Mg^2＋ ions doping does not affect the structure of materials, but the doping concentration of Mg^2＋ could affect the capacity and charge-discharge performance.

关 键 词：磷酸铁锂 离子掺杂 共沉淀 电化学性能 

分 类 号：O646[理学—物理化学]