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Reversible Anionic Redox Activities in Conventional LiNi 1/3 Co 1/3 Mn 1/3 O 2 Cathodes
Author(s) -
Lee GiHyeok,
Wu Jinpeng,
Kim Duho,
Cho Kyeongjae,
Cho Maenghyo,
Yang Wanli,
Kang YongMook
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202001349
Subject(s) - redox , electrochemistry , chemistry , lithium (medication) , cationic polymerization , oxygen , inorganic chemistry , electrode , half reaction , cathode , oxide , oxygen evolution , transition metal , catalysis , polymer chemistry , organic chemistry , medicine , endocrinology
Redox reactions of oxygen have been considered critical in controlling the electrochemical properties of lithium‐excessive layered‐oxide electrodes. However, conventional electrode materials without overlithiation remain the most practical. Typically, cationic redox reactions are believed to dominate the electrochemical processes in conventional electrodes. Herein, we show unambiguous evidence of reversible anionic redox reactions in LiNi 1/3 Co 1/3 Mn 1/3 O 2 . The typical involvement of oxygen through hybridization with transition metals is discussed, as well as the intrinsic oxygen redox process at high potentials, which is 75 % reversible during initial cycling and 63 % retained after 10 cycles. Our results clarify the reaction mechanism at high potentials in conventional layered electrodes involving both cationic and anionic reactions and indicate the potential of utilizing reversible oxygen redox reactions in conventional layered oxides for high‐capacity lithium‐ion batteries.