采用丙烯酸盐自聚合法,确保原料主体各组分和微量Co/F掺杂物,按化学计量比均匀分布并保持结构稳定,实现Co/F共掺获得对锂离子电池LiNi0.5Mn1.5O4改性。经X射线衍射、扫描电镜、恒电流充放电循环和电化学循环伏安测试。结果表明:由Co/F共掺杂制备LiCo0.09Ni0.45Mn1.46O3.88F0.12,其在大倍率充放电下具有良好的循环稳定性。在3C充放电循环下,首次放电容量为122mAh/g,循环60次后容量保持率为93%,具有满足未来电动汽车快速充电技术的应用前景。
The modification of LiNi0.5Mn1.5O4 for lithium-ion batteries was achieved by Co/F codoping with acrylate self-polymerization method,which ensured that the main components of raw materials and trace Co/F dopant were evenly distributed according to stoichiometric ratio and maintained stable structure.Through XRD,SEM,constant current charge discharge cycle and electrochemical cyclic voltammetry test,the sample was characteried.The results shown that the sample material LiCo0.09Ni0.45Mn1.46O3.88F0.12 prepared by Co/F codoping had good cyclic stability at high charge-discharge rates.The first discharge capacity was 122mAh/g under 3C high rate charge-discharge cycle,and the capacity retention rate was 93% after 60 cycles,which can met the application prospect of fast charging technology for electric vehicles in the future.
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