纳米磷酸铁锂包覆镍钴锰三元正极材料的烧结工艺及电化学性能

Baking process and electrochemical performance of nano-lithium iron phosphate coated nickel-cobalt-manganese ternary cathode material

本文采用在高镍镍钴锰三元复合正极材料的颗粒表面,包覆高稳定性橄榄石晶体结构的磷酸铁锂正极材料,并对磷酸铁锂内部进行Mg和Ti金属离子掺杂的基础上,进行焙烧工艺优化的设计,其中在二次烧结温度为780℃合成的样品在放电倍率为0.2C、0.5C和1C时,放电比容量分别为129mAh·g^-1、126mAh·g^-1和112mAh·g^-1,循环20次没有明显的衰减迹象,具有明显的倍率性能和循环性能优势。

In this paper,the particle surface of the high nickel nickel cobalt manganese ternary composite cathode material is coated with a lithium iron phosphate cathode material with a high stability olivine crystal structure,and the interior of the lithium iron phosphate is doped with Mg and Ti metal ions.Carry out the optimized design of the firing process,where the samples synthesized at the firing temperature of 780℃have specific discharge capacities of 129mAh·g^-1,126mAh·g^-1 and 112mAh·g^-1,when the discharge rates are 0.2C,0.5C and 1C.After 20 cycles without obvious signs of attenuation,with obvious advantages in rate performance and cycle performance.