Restraining the escape of lattice oxygen enables superior cyclic performance towards high-voltage Ni-rich cathodes
Restraining the escape of lattice oxygen enables superior cyclic performance towards high-voltage Ni-rich cathodes作者机构：Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and Engineering East China University of Science and Technology Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Chemical Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences
出 版 物：《National Science Review》 (国家科学评论(英文版))
年 卷 期：2023年第10卷第1期
页 面：277-287页
核心收录：
基 金：supported by the National Natural Science Foundation of China (21975074, 21838003 and 91834301) the Innovation Program of Shanghai Municipal Education Commission the Fundamental Research Funds for the Central Universities
主 题：Ni-rich cathode lattice oxygen dual modification long cycle life Li-ion battery
摘 要：Layered Ni-rich cathodes,operating at high voltage with superior cyclic performance,are required to develop future high-energy Li-ion ***,the worst lattice oxygen escape at the high-voltage region easily causes structural instability,rapid capacity fading and safety issues upon ***,we report a dual-track strategy to fully restrain the escape of lattice oxygen from Ni-rich cathodes within 2.7-4.5 V by one-step Ta doping and CeO2coating according to their different diffusion energy *** doped Ta can alleviate the charge compensation of oxygen anions as a positive charge centre to reduce the lattice oxygen escape and induce the formation of elongated primary particles,significantly inhibiting microcrack generation and ***,the layer of CeO2coating effectively captures the remaining escaped oxygen and then the captured oxygen feeds back into the lattice during subsequent *** resultant Ni-rich cathode enables a capacity of 231.3 mAh g-1with a high initial coulombic efficiency of 93.5%.A pouch-type full cell comprising this cathode and a graphite anode exhibits1000 times life cycles at 1C in the 2.7-4.5 V range,with 90.9% capacity retention.
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