锂离子电池正极材料LiMn_(0.8-x)Fe_(0.15+x)Mg_(0.05)PO_4的制备、表征及电化学过程研究

Synthesis,characterization and electrochemical process of LiMn_(0.8-x)Fe_(0.15+x)Mg_(0.05)PO_4 anode material for lithium ion battery

采用溶剂热法制备了Mg掺杂的磷酸铁锰锂(LiMn_(0.8-x)Fe_(0.15+x)Mg_(0.05)PO_4)正极材料。通过X射线衍射、扫描电子显微镜、恒流充放电等手段对合成样品的结构、形貌及电化学性能进行了测试与表征。结果表明,所制样品为具有良好橄榄石型结构的纳米颗粒。Mg的掺入提升了材料中Mn和Fe的容量发挥率,0.1C倍率下材料的容量提升率达23.2%,1C倍率时循环100周后材料比容量为110.1mAh/g,容量保持率高于94%。

LiMn（0.8-x）Fe（0.15＋x）Mg（0.05）PO4 anode material was synthesized by the solvothermal method.The structure,morphology and electrochemical properties of as-prepared samples were characterized by XRD,SEM and galvanostatic charge and discharge process.The results showed that samples were nano particles with olivine-type structure.Mg doping improved capacity rate of Mn and Fe,promoted by 23.2% at 0.1 C.Specific capacity after 100 cycles at 1 Cwas 110.1 mAh/g with retention rate of more than 94%.