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タイトル: | Na₃V₂(PO₄)₃@Carbon Nanofibers: High Mass Loading Electrode Approaching Practical Sodium Secondary Batteries Utilizing Ionic Liquid Electrolytes |
著者: | 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: | 松本, 一彦 萩原, 理加 |
キーワード: | sodium secondary battery NASICON carbon nanofiber high mass loading electrode ionic liquid |
発行日: | 22-Apr-2019 |
出版者: | American Chemical Society |
誌名: | ACS Applied Energy Materials |
巻: | 2 |
号: | 4 |
開始ページ: | 2818 |
終了ページ: | 2827 |
抄録: | Practical sodium secondary batteries require high power, high energy density, and long cyclability. The NASICON-type Na₃V₂PO₄)₃(NVP) is often investigated as a positive electrode material due to its high operation voltage, structural stability, and high Na⁺ ion conductivity. To overcome its low electronic conductivity, NVP requires carbon-coating or the addition of conductive materials for practical use. In this study, carbon nanofibers (CNFs) are incorporated as a conductive material along with glucose for carbon coating and fixing CNF frames to NVP particles. Uniform NVP composite and CNFs network (NVPC@CNFs) are obtained by a combination of sonication and the sol–gel method. Electrochemical measurements using a high mass loading electrode around ∼8.5 mg-active material cm⁻² and Na[FSA]-[C₂C₁im = 1-ethyl-3-methylimidazolium, FSA = bis(fluorosulfonyl)amide) ionic liquid electrolyte suggest safe operations of sodium secondary batteries up to intermediate temperatures (∼373 K). The rate performance further improved by using the NVPC@CNFs compared to NVPC and exhibited a high rate capability (at high geometric current density) of 51.1 mAh g⁻¹ at 10C (10.0 mA cm⁻²) at 298 K and 82.3 mAh g⁻¹ at 100C (100 mA cm⁻²) at 363 K (1C = 118 mA g⁻¹, 1.00 mA cm⁻²). Furthermore, this material with an ionic liquid electrolyte exhibited superior Coulombic efficiencies over 3000 cycles of 99.9%. Electrochemical measurements (electrical impedance spectroscopy, charge–discharge test, cycle test, and rate performance test) clarify the electrochemical characteristics of this material. |
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.9b00176. The full-text file will be made open to the public on 26 March 2020 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/2433/245176 |
DOI(出版社版): | 10.1021/acsaem.9b00176 |
出現コレクション: | 学術雑誌掲載論文等 |
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