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タイトル: | Highly Conductive Ionic Liquid Electrolytes for Potassium-Ion Batteries |
著者: | Yamamoto, Takayuki https://orcid.org/0000-0003-3553-3272 (unconfirmed) Matsubara, Ryohei Nohira, Toshiyuki https://orcid.org/0000-0002-4053-554X (unconfirmed) |
著者名の別形: | 山本, 貴之 松原, 諒平 野平, 俊之 |
発行日: | 11-Feb-2021 |
出版者: | American Chemical Society (ACS) |
誌名: | Journal of Chemical & Engineering Data |
巻: | 66 |
号: | 2 |
開始ページ: | 1081 |
終了ページ: | 1088 |
抄録: | Potassium-ion batteries (K-ion batteries; KIBs) are attractive as high-voltage, low-cost energy storage devices. Ionic liquids (ILs) are potential candidates as safe and high-performance electrolytes for large-scale devices. Imidazolium-based ILs are known to possess high ionic conductivities and moderate electrochemical stabilities. In this study, we report the physicochemical and electrochemical properties of K[FSA]–[C₂C₁im][FSA] (FSA = bis(fluorosulfonyl)amide; C₂C₁im = 1-ethyl-3-methylimidazolium) ILs as new electrolytes for KIBs. A phase diagram constructed from differential scanning calorimetry results indicates that the melting point of this IL is below 273 K at compositions of x(K[FSA]) = 0–0.20 (x(K[FSA]) = molar fraction of K[FSA]). The viscosity, ionic conductivity, and density of the IL were measured for x(K[FSA]) = 0–0.20. The ionic conductivity at x(K[FSA]) = 0.20 is 10.1 mS cm⁻¹ at 298 K, which is comparable to that of typical organic solvent-based KIB electrolytes and higher than that of other ionic liquid electrolytes for KIBs. The electrochemical stability of M[FSA]–[C₂C₁im][FSA] (x(M[FSA]) = 0.20; M = K, Na, and Li) ILs was determined by cyclic voltammetry measurements. The K-based IL exhibits the widest electrochemical window of 5.19 V due to the negative redox potential of the K⁺/K couple. Thus, the K[FSA]–[C₂C₁im][FSA] ionic liquid is expected to be a highly conductive KIB electrolyte. |
著作権等: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Chemical & Engineering Data, 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.jced.0c00879. The full-text file will be made open to the public on 2 February 2022 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/2433/261767 |
DOI(出版社版): | 10.1021/acs.jced.0c00879 |
出現コレクション: | 学術雑誌掲載論文等 |
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