Synthesis and electrochemical properties of Mo-doped Li[Ni_(1/3)Mn_(1/3)Co_(1/3)]O_2 cathode materials for Li-ion battery

摘要

The layered Li[Ni_((1-x)/3)Mn_((1-x)/3)Co_((1-x)/3)Mo_x]O_2 cathode materials (x = 0, 0.005, 0.01, and 0.02) were prepared by a solid-state pyrolysis method (700, 800, 850, and 900 deg C). Its structure and electrochemical properties were characterized by XRD, SEM, XPS, cyclic voltammetry, and charge/discharge tests. It can be learned that the doped sample of x = 0.01 calcined at 800 deg C shows the highest first discharge capacity of 221.6 mAhg~(-1) at a current density of 20 mAg~(-1) in the voltage range of 2.3-4.6 V, and the Mo-doped samples exhibit higher discharge capacity and better cycle-ability than the undoped one at room temperature.