Abstract：Nickel-cobalt-manganese ternary materials have become the best choice of lithium cathode materials for
3C, power tool and selectric vehicles due to its high capacity and high density. In order to avoid side reaction
between electrolyte and cathode materials and enhance the conductivity of cathode material, it is particularly impor‐
tant to modify the cathode material. In this paper, Al（2 SO4）3 and CoSO4 were used as coating raw materials. NaOH
was used as precipitator. The surface of the precursor was coated with a layer of aluminum hydroxide and cobalt
hydroxide by wet coating, and then oxidized to obtain AlOOH and CoOOH. The materials were characterized by
LS-POP9, BET, TD, SEM, XRD and electrochemical test. The results show that the sintered cathode material has
good capacity retention and cycle performance. In the test for 0.2C（3.0-4.3 V）, the specific capacity reaches
175 mAh/g, the initial charge-discharge efficiency, and it is excellent with 100% capacity retention rate after 50
cycles. It can be seen that the double-layer composite coating method provides a way to improve the performance
of lithium anode materials.
2023, Vol. 33 
