LiNixCoyMnzO2 (NCM,x + y + z =1) is one of the most promising cathode candidates for high energy den-sity lithium-ion batteries (LIBs).Due to the potential in enhancing energy density and cyclic life of LIBs,Ni-rich layered NCM (NCM,x ≥ 0.6) have garnered significant research attention,However,improved specific capacity lead to severer expansion and shrinkage of layered lattice,accelerating the stress gen-eration and accumulation even microcracks formation in NCM materials.The microcracks can promote the electrolyte permeation and decomposition,which can consequently reduce cyclic stabilities.Therefore,it is significant to provide an in-depth insight into the origin and impacts of stress accumula-tion,and the available modification strategies for the future development of NCM materials.In this review,we will first summarize the origin of stress accumulation in NCM materials.Next,we discuss the impact of stress accumulation.The electrolyte permeation along microcracks can enhance the extent of side reaction at the interface,trigger phase transformation and consequential capacity fading.To cush-ion the impact of stress accumulation,we will review five main strategies.Finally,concise perspectives to reduce stress accumulation and enhance particle strength in further works will be presented.

Yuefeng Su;Qiyu Zhang;Lai Chen;Liying Bao;Yun Lu;Shi Chen;Feng Wu

School of Materials Science and Engineering,Beijing Key Laboratory of Environmental Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China

能源化学

[1]Yuefeng Su;Qiyu Zhang;Lai Chen;Liying Bao;Yun Lu;Shi Chen;Feng Wu-.Stress accumulation in Ni-rich layered oxide cathodes:Origin,impact,and resolution)[J].能源化学,2022(02):236-253

LiNixCoyMnzO2,cush

Stress,accumulation,rich,layered,oxide,cathodes,Origin,resolution,NCM,one,most,promising,candidates,high,energy,lithium,batteries,LIBs,Due,potential,enhancing,density,cyclic,life,have,garnered,significant,research,attention,However,improved,specific,capacity,lead,severer,expansion,shrinkage,lattice,accelerating,stress,gen,eration,even,microcracks,materials,promote,electrolyte,permeation,decomposition,which,consequently,reduce,stabilities,Therefore,provide,depth,insight,into,origin,impacts,available,modification,strategies,future,development,In,this,review,will,first,summarize,Next,discuss,along,enhance,extent,side,reaction,interface,trigger,phase,transformation,consequential,fading,To,five,main,Finally,concise,perspectives,particle,strength,further,works,be,presented

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