Abstract: The specific capacity of Ni-rich cathode materials increases with the increase of Ni content, which corresponds to the endurance mileage of electric vehicle which needs to be improved urgently. However, surface coating can effectively inhibit the adverse effects of its shortcomings on commercialization, but common coatings can lead to the interface that is unfriendly to lithium ion transmission, while Li2ZrO3 coating can effectively avoid this problem. Chemical precipitation method is widely used in surface coating because of its low cost and simplicity. Urea can effectively reduce the reaction rate and improve the uniformity of the reaction. Therefore, urea-assisted chemical precipitation method was used to precipitate Zr (OH)4 uniformly on the surface of precursor, and then Li2ZrO3 coated Ni-rich cathode material was synthesized through synchronous lithiation. The material characterization shows that the improved chemical precipitation method is helpful to form a uniform coating layer, the high temperature step of synchronization lithization can cause agglomeration and Li2ZrO3 surface coating can improve the chemical environment of Ni-rich cathode materials. The electrochemical performance test of the cathode material shows that Li2ZrO3 coating can improve the electrochemical performance of Ni-rich cathode material and effectively inhibit the growth of charge transfer impedance.
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2020, Vol. 34 
