锶掺杂 LiMnPO4/C 正极材料电化学性能的研究

摘要

采用溶剂热法合成了 Sr2+掺杂的 LiMn1-xSrxPO4/C（x =0,0.01,0.03,0.05)），并利用 XRD、SEM、EIS和电化学性能测试技术对磷酸锰锂的形貌、微观结构及电化学性能进行了表征。正极材料 LiMn0.99Sr0.01PO4/C （LSr1）表现出较高的放电容量和较好的循环性能。在0.1C 的放电倍率下循环50周之后，LSr1的容量为119.2 mA·h·g-1，循环保持率分别为95.5%。%LiMn1-xSrxPO4/C (x = 0, 0.01, 0.03, 0.05) were synthesized by the solvothermal synthesis. The effect of Sr doping was studied by the X-ray diffraction pattern, scanning electronic microscopy, electrochemical impedance spectroscopy and charge/discharge measurement techniques. The LiMn0.99Sr0.01PO4/C (LSr1) shows the high discharge capacity and the best cycling stability among all the samples. It can deliver the highest discharge capacity of 119.2 mA·h·g-1 with 95.5% capacity retention after 50 cycles at 0.1 C.