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タイトル: | Multiphase Transformation of NaFeF₃ During Desodiation and Sodiation |
著者: | Zheng, Yayun Jitto, Shunta 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 実藤, 俊太 黄, 珍光 松本, 一彦 萩原, 理加 |
キーワード: | orthorhombic NaFeF₃ sodium-ion batteries ionic liquid electrolyte elevated temperature multiphase transformation orthorhombic Na₀.₅FeF₃ |
発行日: | 28-Nov-2022 |
出版者: | American Chemical Society (ACS) |
誌名: | ACS Applied Energy Materials |
巻: | 5 |
号: | 11 |
開始ページ: | 14361 |
終了ページ: | 14371 |
抄録: | The orthorhombic NaFeF₃, which is envisioned to be an auspicious positive electrode for Na-ion batteries, has drawn considerable interest as an environmentally benign energy material with exceptionally high theoretical capacity. Despite these prospects, the reaction mechanism(s) during orthorhombic NaFeF₃ operations are still not well understood. Thus, in a bid to expound on this research space, we report the reaction mechanism(s) of a carbon-coated orthorhombic NaFeF₃ prepared through high-energy ball-milling and heat treatment processes. A thermally stable ionic liquid electrolyte at elevated temperatures is employed to maximize the utilization of NaFeF₃. The orthorhombic NaFeF₃ exhibits high electrochemical activity and long-term cycling stability of up to 400 cycles at 90℃. Through a combination of galvanostatic intermittent titration technique and synchrotron X-ray powder diffraction measurements, we discover that the (de)sodiation processes are facilitated by a multiphase transformation mechanism. Further, we experimentally identify, for the first time, an orthorhombic Na₀₅FeF₃ compound as an intermediate phase of the transformations. The results discussed in this work are expected to provide invaluable insights for the future advancement of the Na–Fe–F system. |
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 © 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.2c02904. The full-text file will be made open to the public on 31 October 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/2433/277552 |
DOI(出版社版): | 10.1021/acsaem.2c02904 |
出現コレクション: | 学術雑誌掲載論文等 |
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