Mg2+掺杂的LiFePO4材料的共沉淀合成与表征

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；Mg^2＋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．

Synthesis of Mg2+ Doped Lithium Iron Phosphate by Co-precipitation

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.