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タイトル: | Stable Cycle Performance of a Phosphorus Negative Electrode in Lithium-Ion Batteries Derived from Ionic Liquid Electrolytes |
著者: | Kaushik, Shubham 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: | lithium-ion batteries solid electrolyte interphase ionic liquid phosphorus negative electrode acetylene black |
発行日: | Mar-2021 |
出版者: | American Chemical Society (ACS) |
誌名: | ACS Applied Materials & Interfaces |
巻: | 13 |
号: | 9 |
開始ページ: | 10891 |
終了ページ: | 10901 |
抄録: | Although high-capacity negative electrode materials are seen as a propitious strategy for improving the performance of lithium-ion batteries (LIBs), their advancement is curbed by issues such as pulverization during the charge/discharge process and the formation of an unstable solid electrolyte interphase (SEI). In particular, electrolytes play a vital role in determining the properties of an SEI layer. Thus, in this study, we investigate the performance of a red phosphorus/acetylene black composite (P/AB) prepared by high-energy ball milling as a negative electrode material for LIBs using organic and ionic liquid (IL) electrolytes. Galvanostatic tests performed on half cells demonstrate high discharge capacities in the 1386–1700 mAh (g-P/AB)⁻¹ range along with high Coulombic efficiencies of 85.3–88.2% in the first cycle, irrespective of the electrolyte used. Upon cycling, the Li[FSA]-[C₂C₁im][FSA] (FSA⁻ = bis(fluorosulfonyl)amide and C₂C₁im⁺ = 1-ethyl-3-methylimidazolium) IL electrolyte (2:8 in mol) demonstrates a high capacity retention of 78.8% after 350 cycles, whereas significant capacity fading is observed in the Li[PF₆] and Li[FSA] organic electrolytes. Electrochemical impedance spectroscopy conducted with cycling revealed lower interfacial resistance in the IL electrolyte than in the organic electrolytes. Scanning electron microscopy and X-ray photoelectron spectroscopy after cycling in different electrolytes evinced that the IL electrolyte facilitates the formation of a robust SEI layer comprising multiple layers of sulfur species resulting from FSA⁻ decomposition. A P/AB|LiFePO₄ full cell using the IL electrolyte showed superior capacity retention than organic electrolytes and a high energy density under ambient conditions. This work not only illuminates the improved performance of a phosphorous-based negative electrode alongside ionic liquid electrolytes but also displays a viable strategy for the development of high-performance LIBs, especially for large-scale applications. |
著作権等: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, 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/acsami.0c21412. The full-text file will be made open to the public on 10 March 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/2433/265339 |
DOI(出版社版): | 10.1021/acsami.0c21412 |
PubMed ID: | 33630586 |
出現コレクション: | 学術雑誌掲載論文等 |
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