纳米磷酸铁锂包覆镍钴锰三元正极材料的金属掺杂改性及电化学性能

Metal doping modification and electrochemical performance of nano-lithium iron phosphate coated nickel-cobalt-manganese ternary cathode material

本文优先制备高镍镍钴锰三元正极材料,然后在其表面包覆纳米级磷酸铁锂,系统研究金属元素的掺杂工艺,制备出复合正极材料。单掺Mg元素的复合正极材料在0.2C的放电比容量最佳;单掺Ti元素的复合正极材料在1C的放电比容量最高;同步掺Mg和Ti元素的复合正极材料在0.5C的放电比容量最优。该复合正极材料在循环性能方面具有明显优势。

In this paper,the high nickel nickel cobalt manganese ternary cathode material is prepared first,and then the surface is coated with nano-scale lithium iron phosphate,and the doping process of metal elements is systematically studied to prepare a composite cathode material.The composite cathode material doped with Mg element has the best discharge specific capacity at 0.2C;the composite cathode material doped with Ti element has the highest discharge specific capacity at 1C;the composite cathode material doped with Mg and Ti elements simultaneously has the optimal discharge capacity at 0.5C.The composite cathode material has obvious advantages in terms of cycle performance.