このアイテムのアクセス数: 42

このアイテムのファイル:
ファイル 記述 サイズフォーマット 
acs.jpcc.5b03273.pdf1.29 MBAdobe PDF見る/開く
タイトル: Delithiation/lithiation behavior of LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> studied by in situ and ex situ <sup>6,7</sup>Li NMR spectroscopy
著者: Shimoda, Keiji
Murakami, Miwa
Komatsu, Hideyuki
Arai, Hajime
Uchimoto, Yoshiharu
Ogumi, Zempachi
著者名の別形: 下田, 景士
村上, 美和
荒井, 創
内本, 喜晴
小久見, 善八
発行日: 27-May-2015
出版者: American Chemical Society
誌名: Journal of Physical Chemistry C
巻: 119
号: 24
開始ページ: 13472
終了ページ: 13480
抄録: Delithiation and lithiation behaviors of ordered spinel LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> and disordered spinel LiNi<inf>0.4</inf>Mn<inf>1.6</inf>O<inf>4</inf> were investigated by using in situ (in operando) <sup>7</sup>Li NMR and ex situ <sup>6</sup>Li MAS NMR spectroscopy. The in situ <sup>7</sup>Li monitoring of the ordered spinel revealed a clear appearance and subsequent disappearance of a new signal from the well-defined phase Li<inf>0.5</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf>, suggesting the two-phase reaction processes among Li<inf>1.0</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf>, Li<inf>0.5</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf>, and Li<inf>0.0</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf>. Also, for the disordered spinel, Li<inf>0.5</inf>Ni<inf>0.4</inf>Mn<inf>1.6</inf>O<inf>4</inf> was identified with a broad distribution in Li environment. High-resolution <sup>6</sup>Li MAS NMR spectra were also acquired for the delithiated and lithiated samples to understand the detailed local structure around Li ions. We suggested that the nominal Li-free phase Li<inf>0.0</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> can accommodate a small amount of Li ions in its structure. The tetragonal phases Li<inf>2.0</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> and Li<inf>2.0</inf>Ni<inf>0.4</inf>Mn<inf>1.6</inf>O<inf>4</inf>, which occurred when the cell was discharged down to 2.0 V, were very different in the Li environment from each other. It is found that <sup>6, 7</sup>Li NMR is highly sensitive not only to the Ni/Mn ordering in LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> but also to the valence changes of Ni and Mn on charge-discharge process.
著作権等: This document is the Accepted Manuscript version of a Published Work that appeared in final form in 'Journal of Physical Chemistry C', copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/acs.jpcc.5b03273
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/219479
DOI(出版社版): 10.1021/acs.jpcc.5b03273
出現コレクション:学術雑誌掲載論文等

アイテムの詳細レコードを表示する

Export to RefWorks


出力フォーマット 


このリポジトリに保管されているアイテムはすべて著作権により保護されています。