掺钴复合材料LiMn_(2-x)Co_xO_4 的制备与性能

Preparation and properties of LiMn_(2-x)Co_xO_4 material doped with cobalt

在锂离子蓄电池正极材料中,尖晶石LiMn2O4被认为是最有前景的正极材料,但它的高温性能和循环过程中的容量衰减成为其工业化道路上的主要障碍。采用高温固相法合成了掺钴复合材料LiMn2-xCoxO4。应用X射线衍射分析对材料的结构进行表征,采用恒电流法和循环伏安法对材料的电化学性能进行了测试。结果表明,钴的掺入能提高合成材料的结构稳定性,当掺钴量x为0.1时,所合成的材料具有较高的放电容量和较好的循环性,可作为锂离子蓄电池的正极材料。

Spinel LiMn2O4 is the most promising cathode material for Liion battery. However, its properties at high temperature and the capacity fading during cycles is the main barrier for industrialization. The composite material LiMn2-xCoxO4 was synthesized by solid reaction at high temperature. Its structure was characterized by XRD and its electrochemical properties were tested by constant current and cyclic voltammetry methods. The results show that the structural stability of the material is improved by doping cobalt. When x, the doping amount, is 0.1, the synthesized material has high charge/discharge capacity and good cycling property and is suitable to be used as cathode material for Liion battery.