文献类型：期刊文献

中文题名：Restraining the escape of lattice oxygen enables superior cyclic performance towards high-voltage Ni-rich cathodes

作者：Haifeng Yu[1];Huawei Zhu[1];Hongliang Jiang[2];Xiaozhi Su[3];Yanjie Hu[1];Hao Jiang[1,2];Chunzhong Li[1,2]

机构：[1]Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;[2]Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;[3]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China

年份：2023

卷号：10

期号：1

起止页码：272

中文期刊名：National Science Review

外文期刊名：国家科学评论（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2023_2024】；PubMed;

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。

语种：英文

中文关键词：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 batteries.However,the worst lattice oxygen escape at the high-voltage region easily causes structural instability,rapid capacity fading and safety issues upon cycling.Here,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 CeO_(2)coating according to their different diffusion energy barriers.The 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 propagation.Additionally,the layer of CeO_(2)coating effectively captures the remaining escaped oxygen and then the captured oxygen feeds back into the lattice during subsequent discharge.The resultant Ni-rich cathode enables a capacity of 231.3 mAh g^(-1)with a high initial coulombic efficiency of 93.5%.A pouch-type full cell comprising this cathode and a graphite anode exhibits>1000 times life cycles at 1C in the 2.7-4.5 V range,with 90.9%capacity retention.