Park, K.-Y. Zhu, Y. Torres-Castanedo, C.G. Jung, H.J. Luu, N.S. Kahvecioglu, O. Yoo, Y. Seo, J.-W.T. Downing, J.R. Lim, Hee Dae Bedzyk, M.J. Wolverton, C. Hersam, M.C. 2024-01-19T13:02:29Z 2024-01-19T13:02:29Z 2022-01-10 2022-01 0935-9648 https://pubs.kist.re.kr/handle/201004/115898 LiNiO2 (LNO) is a promising cathode material for next-generation Li-ion batteries due to its exceptionally high capacity and cobalt-free composition that enables more sustainable and ethical large-scale manufacturing. However, its poor cycle life at high operating voltages over 4.1？V impedes its practical use, thus motivating efforts to elucidate and mitigate LiNiO2 degradation mechanisms at high states of charge. Here, a multiscale exploration of high-voltage degradation cascades associated with oxygen stacking chemistry in cobalt-free LiNiO2, is presented. Lattice oxygen loss is found to play a critical role in the local O3？O1 stacking transition at high states of charge, which subsequently leads to Ni-ion migration and irreversible stacking faults during cycling. This undesirable atomic-scale structural evolution accelerates microscale electrochemical creep, cracking, and even bending of layers, ultimately resulting in macroscopic mechanical degradation of LNO particles. By employing a graphene-based hermetic surface coating, oxygen loss is attenuated in LNO at high states of charge, which suppresses the initiation of the degradation cascade and thus substantially improves the high-voltage capacity retention of LNO. Overall, this study provides mechanistic insight into the high-voltage degradation of LNO, which will inform ongoing efforts to employ cobalt-free cathodes in Li-ion battery technology. ？ 2021 Wiley-VCH GmbH English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Elucidating and Mitigating High-Voltage Degradation Cascades in Cobalt-Free LiNiO2 Lithium-Ion Battery Cathodes Article 10.1002/adma.202106402 1 Advanced Materials, v.34, no.3 Advanced Materials 34 3 N scie scopus 000745097300042 2-s2.0-85119373451 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article in Press STRUCTURAL CHARACTERIZATION OXIDE CATHODE ELECTROCHEMISTRY PHASE TRANSITION LIXNIO2 graphene coating lithium battery lithium nickel oxide oxygen evolution stacking faults