Unveiling the impact of residual Li conversion and cation ordering on electrochemical performance of Co-free Ni-rich cathodes

作     者：Chu Wang Lei Tan Hongling Yi Zixiang Zhao Xiaoli Yi Youyuan Zhou Junchao Zheng Jiexi Wang Lingjun Li Chu Wang;Lei Tan;Hongling Yi;Zixiang Zhao;Xiaoli Yi;Youyuan Zhou;Junchao Zheng;Jiexi Wang;Lingjun Li

作者机构：School of Materials Science and EngineeringChangsha University of Science and TechnologyChangsha 410114China School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410114China School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China Hunan Changyuan Lico Co.Ltd.Changsha 410205China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2022年第15卷第10期

页      面：9038-9046页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(No.51774051) the Science and Technology Planning Project of Hunan Province(No.2019RS2034) the Hunan High-tech Industry Science and Technology Innovation Leading Plan(No.2020GK2072) the Changsha City Fund for Distinguished and Innovative Young Scholars(No.KQ1707014) 

主　　题：Li-ion batteries Co-free Ni-rich cathodes residual Li conversion cation ordering 

摘      要：The residual Li and Li^(+)/Ni_(2)+cation mixing play essential roles in the electrochemical properties of Ni-rich ***,a general relationship between the residual Li conversion,cation mixing,and their effects on the Li^(+)kinetics and structural stability has yet to be established,due to the presence of cobalt in the ***,we explore the synergistic impact of the residual Li conversion and cation ordering on a Co-free Ni-rich cathode(i.e.,LiNi0.95Mn0.05O_(2)).It discloses that the rate capability is mainly affected by residual Li contents and operating ***,residual Li can be electrochemically converted to cathode electrolyte interphase(CEI)below 4.3 V,thus inducing high interphase resistance,and decomposes to produce CO_(2)-dominated gas at 4.5 V,causing temporary enhancement of Li^(+)diffusivity but severe surface degradation during ***,the cycling performance of Co-free Ni-rich cathode is not only determined by Li^(+)/Ni_(2)+cation-ordered superlattice,which enhances the structural stability as it functions as the pillar to impede lattice collapse at a highly charged state,but also by the robust CEI layers which protect the bulk from electrolyte attack under 4.3 *** findings promote an in-depth understanding of residual Li conversion and Li^(+)/Ni_(2)+cation ordering on Co-free Ni-rich cathode.