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タイトル: | N-Ethyl- N-propylpyrrolidinium Bis(fluorosulfonyl)amide Ionic Liquid Electrolytes for Sodium Secondary Batteries: Effects of Na Ion Concentration |
著者: | Yang, Huan Hwang, Jinkwang https://orcid.org/0000-0003-4800-3158 (unconfirmed) Wang, Yushen Matsumoto, Kazuhiko https://orcid.org/0000-0002-0770-9210 (unconfirmed) Hagiwara, Rika |
著者名の別形: | 楊, 歓 黄, 珍光 松本, 一彦 萩原, 理加 |
キーワード: | General Energy Physical and Theoretical Chemistry Electronic, Optical and Magnetic Materials Surfaces, Coatings and Films |
発行日: | 12-Sep-2019 |
出版者: | American Chemical Society |
誌名: | Journal of Physical Chemistry C |
巻: | 123 |
開始ページ: | 22018 |
終了ページ: | 22026 |
抄録: | A hybrid inorganic–organic ionic liquid based on sodium bis(fluorosulfonyl)amide (Na[FSA]) and [N-ethyl-N-methylpyrrolidinium] [FSA] ([C₂C₁pyrr][FSA]) is investigated as an electrolyte for sodium secondary battery operation over an extended temperature and Na⁺ ion fraction ranges. The phase diagram of the system reveals a wide liquid-phase temperature range at Na[FSA] mole fractions ranging from 0.3 to 0.7 near room temperature where the 0.7 mole fraction equates to a molar concentration of 5.42 mol L⁻¹. The viscosity and molar ionic conductivity are consistent with the fractional Walden rule, and the temperature dependence of these quantities obeys the Vogel–Tammann–Fulcher equation. The optimal Na[FSA] content of the ionic liquid occurs at mole fractions between 0.3 and 0.7 based on the sodium metal deposition/dissolution behavior and the rate and cycle properties of a NASICON-type cathode, Na₃V₂(PO₄)₃/C (NVPC). The greatest cycle efficiency εcycle of Na-metal deposition/dissolution is observed at x(Na[FSA]) = 0.6 (εcycle = 93.3%). Although Na/NVPC half-cell tests indicate a maximum rate and cycle performance at x(Na[FSA]) = 0.6 (83.5% retention at 100 C (11700 mA g⁻¹) and 80% retention after 4000 cycles at 2 C (234 mA g⁻¹)), NVPC/NVPC symmetric cell tests indicate that the greater Na[FSA] fraction provides better rate performance and that half-cell tests with a Na-metal electrode do not provide reliable data for the target electrode/electrolyte system. |
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 https://doi.org/10.1021/acs.jpcc.9b05941. The full-text file will be made open to the public on 16 August 2020 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. 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。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/244215 |
DOI(出版社版): | 10.1021/acs.jpcc.9b05941 |
出現コレクション: | 学術雑誌掲載論文等 |
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