Benefiting from high energy density and low cost,Ni-rich LiNixCoyMn/Al1-x-yO2 materials have received great attention as promising cathode candidates for next-generation high-energy lithium-ion batteries(LIBs)that are widely used in electric vehicles(EVs).However,with an increased Ni content,Ni-rich cathode materials suffer from severe structural,chemical,and mechanical instabilities,seriously restricting their industrially safe application in power LIBs of EVs.In this review,primarily,the synthesis methods of Ni-rich cathode materials are summarized in detail,which include solid-state method,sol-gel method,hydrothermal method,spray-drying method,and co-precipitation method.Subsequently,the key failure mechanisms,including ion mixing and irreversible phase transition,residual Li species and interface side reactions,mechanical microcracks,and transition metal dissolutions,are thoroughly analyzed throughout the preparation,storage,and service of Ni-rich cathode materials,thereby clarifying various performance decay behaviors of materials.The modification strategies that cover ion doping,surface coating,core-shell/gradient materials,and single-crystal materials are systematically discussed for Ni-rich cathode materials,aiming at presenting conspicuous research progress and current shortcomings for the stabilization of Ni-rich cathode materials.Finally,this review presents a perspective toward future development and optimization for Ni-rich cathode materials,aiming at delivering a theoretical guidance for propelling its industrial safe application in high-energy LIBs.
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维普
