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タイトル: Oxidation behaviour of lattice oxygen in Li-rich manganese-based layered oxide studied by hard X-ray photoelectron spectroscopy
著者: Shimoda, Keiji
Minato, Taketoshi
Nakanishi, Koji
Komatsu, Hideyuki
Matsunaga, Toshiyuki
Tanida, Hajime
Arai, Hajime
Ukyo, Yoshio
Uchimoto, Yoshiharu
Ogumi, Zempachi
著者名の別形: 下田, 景士
湊, 丈俊
谷田, 肇
荒井, 創
右京, 良雄
内本, 喜晴
小久見, 善八
発行日: Apr-2016
出版者: Royal Society of Chemistry
誌名: Journal of Materials Chemistry A
巻: 4
開始ページ: 5909
終了ページ: 5916
抄録: The oxidation/reduction behaviours of lattice oxygen and transition metals in a Li-rich manganese-based layered oxide Li[Li0.25Ni0.20Mn0.55]O1.93 are investigated by using hard X-ray photoelectron spectroscopy (HAX-PES). By making use of its deeper probing depth rather than in-house XPS analyses, we clearly confirm the formation of O- ions as bulk oxygen species in the active material. They are formed on the 1st charging process as a charge compensation mechanism for delithiation and decrease on discharging. In particular, the cation-anion dual charge compensation involving Ni and O ions is suggested during the voltage slope region of the charging process. The Ni ions in the material are considered to increase the capacity delivered by a reversible anion redox reaction with the suppression of O2 gas release. On the other hand, we found structural deterioration in the cycled material. The O- species are still observed but are electrochemically inactive during the 5th charge-discharge cycle. Also, the oxidation state of Ni ions is divalent and inactive, although that of Mn ions changes reversibly. We believe that this is associated with the structural rearrangement occurring after the activation process during the 1st charging, leading to the formation of spinel- or rocksalt-like domains over the sub-surface region of the particles.
著作権等: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
URI: http://hdl.handle.net/2433/219443
DOI(出版社版): 10.1039/c6ta01152g
出現コレクション:学術雑誌掲載論文等

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