Synthesis and Electrochemical Performance of Cathode Material LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2 for Lithium-ion Batteries

The cathode material LiNi0.4Co0.2Mn0.4O2 for lithium ion battery was prepared by carbonate co-precipitation method.X-ray diffraction(XRD),scanning electron microscopy(SEM) and electrochemical tests were used to characterize structure,appearance and electrochemical performances of LiNi0.4Co0.2Mn0.4O2.It was found that the sample synthesized at 800 ℃ for 12 h is homogenous distribution of particles.Electrochemical test shows that the initial discharge capacity of LiNi0.4Co0.2Mn0.4O2 powder is 151 mAh·g-1 at the rate of 0.2 C,and the capacity retains 138 mAh·g-1 after 30 cycles.