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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  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-4800-3158 (unconfirmed)
Matsumoto, Kazuhiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0770-9210 (unconfirmed)
Hagiwara, Rika  KAKEN_id  orcid 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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