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タイトル: | Electrochemical and Structural Behavior of Trirutile-Derived FeF3 During Sodiation and Desodiation |
著者: | Zheng, Yayun Hwang, Jinkwang https://orcid.org/0000-0003-4800-3158 (unconfirmed) Matsumoto, Kazuhiko https://orcid.org/0000-0002-0770-9210 (unconfirmed) Hagiwara, Rika https://orcid.org/0000-0002-7234-3980 (unconfirmed) |
著者名の別形: | 鄭, 亞雲 黄, 珍光 松本, 一彦 萩原, 理加 |
キーワード: | tetragonal FeF₃ cubic FeF₃ structural transition sodium-ion batteries ionic liquids |
発行日: | 28-Mar-2022 |
出版者: | American Chemical Society (ACS) |
誌名: | ACS Applied Energy Materials |
巻: | 5 |
号: | 3 |
開始ページ: | 3137 |
終了ページ: | 3145 |
抄録: | Despite significant advances in the Li-Fe-F systems for lithium-ion batteries, the investigation on the Na-Fe-F systems for sodium-ion batteries is still insufficient. Herein, trirutile-derived FeF₃ prepared through the electrochemical delithiation of trirutile Li₀.₅FeF₃ has been examined as the positive electrode of sodium-ion batteries at 90 °C with a thermally stable ionic liquid electrolyte to shed light on the structural evolutions occurring during sodiation–desodiation for the first time. Synchrotron X-ray diffraction revealed that the reversible topotactic extraction/insertion of 0.2 Na⁺ proceeds during cycling between 2.6 and 4.0 V, which triggers a two-phase reaction between tetragonal NaxFeF₃ and tetragonal FeF₃. A lower cutoff voltage of 2.3–4.0 V induces a partial structural transition from tetragonal FeF₃ into cubic FeF₃ along with cycling, where the topotactic Na⁺ extraction/insertion not only occurs in the tetragonal structure but also involves the reversible phase transformation between orthorhombic NaFeF₃ and cubic FeF₃ after several cycles. |
著作権等: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, Copyright © 2022 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaem.1c03756. The full-text file will be made open to the public on February 27, 2023 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. 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/2433/274797 |
DOI(出版社版): | 10.1021/acsaem.1c03756 |
出現コレクション: | 学術雑誌掲載論文等 |
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