Cycle stability and thermal safety are critical to the commercialization of nickel-rich layered materials,yet whether there is a potential correlation between these two factors is still controversial.Herein,the relationship between the cycle stability and thermal stability of nickel-rich cathode materials have been systematically studied through five different calcination temperatures of Li[Ni0.83Co0.12Mn0.05]O2(NCM83)cathode materials.The research results confirm that the cycle stability and thermal safety of nickel-rich cathode materials do not necessarily show a positive correlation.Actually,with the calcina-tion temperature elevated,the thermal stability of the NCM83 is enhanced,while the cycle stability is degraded.This opposite correlation is not commonly reported in previous literatures.In this work,sys-tematical characterizations demonstrate that under the experimental conditions,the capacity retention of NCM83 is mainly determined by the Li/Ni cation disorder and H2-H3 irreversible phase transition,which is optimal at lower calcination temperature.Meanwhile,the thermal stability is mainly impacted by thermal expansion characteristics and interfacial stability of cathode material,and it is dramatically improved by the mechanical strength of the secondary particles reinforced at high calcinated tempera-ture.This study provides some new insights on understanding and designing of the high-energy cathode materials with long cycle-life and superior safety.

Lifan Wang;Rui Wang;Cong Zhong;Liangtao Lu;Danya Gong;Qinling Shi;Yujie Fan;Xindong Wang;Chun Zhan;Guicheng Liu

Department of Physical Chemistry,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Department of Physics,Dongguk University,Seoul 04620,Republic of Korea

能源化学

[1]Lifan Wang;Rui Wang;Cong Zhong;Liangtao Lu;Danya Gong;Qinling Shi;Yujie Fan;Xindong Wang;Chun Zhan;Guicheng Liu-.New insight on correlation between the electrochemical stability and the thermal stability of high nickel cathode materials)[J].能源化学,2022(09):265-275

NCM83,calcina,tematical

New,correlation,between,electrochemical,stability,thermal,high,nickel,cathode,materials,Cycle,safety,are,critical,commercialization,rich,layered,yet,whether,there,potential,these,two,factors,still,controversial,Herein,relationship,cycle,have,been,systematically,studied,through,five,different,calcination,temperatures,Li,Ni0,83Co0,12Mn0,O2,research,results,confirm,that,do,not,necessarily,show,positive,Actually,elevated,enhanced,degraded,This,opposite,commonly,reported,previous,literatures,In,this,work,characterizations,demonstrate,experimental,conditions,capacity,retention,mainly,determined,by,cation,disorder,H2,H3,irreversible,phase,transition,which,optimal,lower,Meanwhile,impacted,expansion,characteristics,interfacial,dramatically,improved,mechanical,strength,secondary,particles,reinforced,calcinated,study,provides,some,new,insights,understanding,designing,energy,long,life,superior

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