Abstract：In this paper, the LiNi0.6Co0.2Mn0.2O2(NCM) ternary lithium ion cathode material was successfully synthesized by the combination of oxalic acid co-precipitation method and high temperature solid phase method. The cobalt manganese oxalate precursor was synthesized by hydrothermal first, and then High temperature solid-phase reaction with nickel salt and lithium salt avoids the problem of uneven precipitation of Ni2+, Co2+ and Mn2+ in oxalic acid. X-ray diffraction analysis (XRD) results show that the material has a typical α-NaFeO2-like layered structure and low cation mixing. Electrochemical performance test results show that compared to commercial lithium nickel cobalt manganese oxide (NCM-commercial), NCM622 exhibits excellent cycle stability and rate performance. The initial discharge of NCM-850 samples treated at 850°C at 0.1C The capacity is 184.1mAh g-1 while NCM-commercial is only 175mAh g-1. After 100 cycles of 0.2C, the capacity retention rate of NCM-850 is 88.6% while the retention rate of NCM-commercial is only 47.8%, at 5C, NCM-850 still has a capacity of 98.1mAh g-1. This is mainly due to the material having a more stable crystal structure and larger ion diffusion channels.
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