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タイトル: | Potassium Difluorophosphate as an Additive for Potassium Ion Batteries |
著者: | Huan, Yang Chen, Chih-Yao Hwang, Jinkwang https://orcid.org/0000-0003-4800-3158 (unconfirmed) Kubota, Keigo Matsumoto, Kazuhiko https://orcid.org/0000-0002-0770-9210 (unconfirmed) Hagiwara, Rika |
著者名の別形: | 楊, 歓 黄, 珍光 松本, 一彦 萩原, 理加 |
キーワード: | potassium difluorophosphate (KDFP) electrolyte additive potassium-ion batteries graphite graphite intercalation compounds (GICs) |
発行日: | 12-Aug-2020 |
出版者: | American Chemical Society (ACS) |
誌名: | ACS Applied Materials & Interfaces |
巻: | 12 |
号: | 32 |
開始ページ: | 36168 |
終了ページ: | 36176 |
抄録: | The limited cyclability and inferior Coulombic efficiency of graphite negative electrodes have been major impediments to their practical utilization in potassium-ion batteries (PIBs). Herein, for the first time, potassium difluorophosphate (KDFP) electrolyte additive is demonstrated as a viable solution to these bottlenecks by facilitating the formation of a stable and K⁺-conducting solid–electrolyte interphase (SEI) on graphite. The addition of 0.2 wt % KDFP to the electrolyte results in significant improvements in the (de)potassiation kinetics, capacity retention (76.8% after 400 cycles with KDFP vs 27.4% after 100 cycles without KDFP), and average Coulombic efficiency (∼99.9% during 400 cycles) of the graphite electrode. Moreover, the KDFP-containing electrolyte also enables durable cycling of the K/K symmetric cell at higher efficiencies and lower interfacial resistance as opposed to the electrolyte without KDFP. X-ray diffraction and Raman spectroscopy analyses have confirmed the reversible formation of a phase-pure stage-1 potassium–graphite intercalation compound (KC₈) with the aid of KDFP. The enhanced electrochemical performance by the KDFP addition is discussed based on the analysis of the SEI layer on graphite and K metal electrodes by X-ray photoelectron spectroscopy. |
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.0c09562. The full-text file will be made open to the public on 21 July 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. 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。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/260565 |
DOI(出版社版): | 10.1021/acsami.0c09562 |
PubMed ID: | 32692540 |
出現コレクション: | 学術雑誌掲載論文等 |
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