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タイトル: | A Hexafluorophosphate-Based Ionic Liquid as Multifunctional Interfacial Layer between High Voltage Positive Electrode and Solid-State Electrolyte for Sodium Secondary Batteries |
著者: | Wang, Di Takiyama, Masaya 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: | 王, 帝 滝山, 雅也 黄, 珍光 松本, 一彦 萩原, 理加 |
キーワード: | anodic limits high voltage electrodes hybrid solid-state electrolytes ionic liquids sodium secondary batteries |
発行日: | 11-Aug-2023 |
出版者: | Wiley |
誌名: | Advanced Energy Materials |
巻: | 13 |
号: | 30 |
論文番号: | 2301020 |
抄録: | Sodium secondary batteries have gained accolades as future energy storage devices due to their low costs and environmental benignity, but are heavily impeded by the poor anodic stabilities of most electrolytes, including solid-state electrolytes (SSE), that render them incompatible with high-voltage positive materials. This study reports, for the first time, a new synthesis technique using a fluorohydrogenate ionic liquid (IL)precursor to prepare a [DEME][PF₆] ([DEME]⁺: N, N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium) with high yield and high purity. Herein, a Na[PF₆]-[DEME][PF₆] IL is formulated and subjected to a series of electrochemical tests to validate its performance in battery applications. The present IL harbors a strong oxidative stability (up to 5.2 V on Pt and >4.5 V on conductive carbon electrodes) that aids in the suppression of oxidative decompositions of one typical SSE, for example, beta alumina solid electrolyte (BASE), thereby extending their electrochemical window in hybrid SSE systems. A hybrid solid-state Na secondary battery employing a high voltage positive electrode, Na₃V₂(PO₄)₂F₃, is assembled using the BASE/IL configuration, and features energy density and superior cycling performance. This work demonstrates that sandwiching an SSE between the oxidatively stable [PF₆]⁻ IL can be an effective design for high voltage operation Na secondary batteries. |
著作権等: | © 2023 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/284863 |
DOI(出版社版): | 10.1002/aenm.202301020 |
出現コレクション: | 学術雑誌掲載論文等 |
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