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The rich-nickel LiNi1-x-yCo_xMn_yO2(NCM)/LiNi1-x-yCo_xAl_yO2(NCA) ternary layered cathode materials are considered as one of the most promising lithium battery cathode materials due to its high specific capacity and low cost.However,the nickel-rich NCM/NCA ternary layered cathode materials are sensitive to H2O and CO2 in the air,and is easy to generate residual alkali compound LiOH/Li2CO3(RLCs) on the surface.The existence of RLCs will dramatically deteriorate the thermal stability and electrochemical performance of nickel-rich ternary layered cathode materials,resulting in its large-scale commercial application faced severe challenges.This paper firstly reviewed the composition and formation mechanism of RLCs,and systematically summarized the failure mechanisms of materials caused by RLCs,such as microcrack propagation,Li~+/Ni~(2+) mixing,interfacial side reactions and lattice phase transformation.Meanwhile,the common RLCs removal strategies were also introduced.The research progress of deionized water washing,anhydrous ethanol washing,solution washing and subsequent integrated treatment in removing RLCs were deeply reviewed.In addition,the influencing mechanisms of washing process for the structure,morphology and electrochemical performance of high nickel ternary cathode materials were also highlighted.Finally,the characteristics of the solution washing strategy were summarized,and the future research and development of removal process for residual alkali compounds on the surface of rich-nickel NCM/NCA ternary layered cathode material were also prospected....
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