ID | 60290 |
フルテキストURL | |
著者 |
Gotoh, Kazuma
Graduate School of Natural Science & Technology, Okayama University
Kaken ID
researchmap
Yamakami, Tomu
Graduate School of Natural Science & Technology, Okayama University
Nishimura, Ishin
Graduate School of Natural Science & Technology, Okayama University
Kometani, Hina
Graduate School of Natural Science & Technology, Okayama University
Ando, Hideka
Graduate School of Natural Science & Technology, Okayama University
Hashi, Kenjiro
National Institute for Materials Science
Shimizu, Tadashi
National Institute for Materials Science
Ishida, Hiroyuki
Graduate School of Natural Science & Technology, Okayama University
Kaken ID
publons
researchmap
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抄録 | A precise understanding of the mechanism for metal (Li and Na) plating on negative electrodes that occurs with overcharging is critical to managing the safety of lithium- and sodium-ion batteries. In this work, an in-depth investigation of the overlithiation/oversodiation and subsequent delithiation/desodiation of graphite and hard carbon electrodes in the first cycle was conducted using operando7Li/23Na solid-state NMR. In the 7Li NMR spectra of half cells of carbon electrodes and metal counter electrodes, three types of signals corresponding to Li dendrites that formed on the surface of graphite, hard carbon, and the counter electrode were distinguished from the signal of Li metal foil of the counter electrode by applying an appropriate orientation of the testing cell. For graphite overlithiation, the deposition of Li dendrites started immediately or soon after the minimum electric potential in the lithiation curve. In contrast, the deposition of Li dendrites in hard carbon started after the end of quasimetallic lithium formation for overlithiation at rates below 3.0C. Similar behaviour was also observed for the oversodiation of hard carbon. The formation of quasimetallic Li or Na in the pores of hard carbon serves as a buffer for the metal plating that occurs with overcharging of the batteries. Furthermore, some of the deposited Li/Na dendrites contribute to reversible capacities. A mechanism for the inhomogeneous disappearance of quasimetallic Li during delithiation of hard carbon is also proposed.
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発行日 | 2020-05-19
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出版物タイトル |
Journal of Materials Chemistry A: materials for energy and sustainability
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巻 | 8巻
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号 | 29号
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出版者 | Royal Society of Chemistry
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開始ページ | 14472
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終了ページ | 14481
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ISSN | 2050-7488
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NCID | AA12603290
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資料タイプ |
学術雑誌論文
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言語 |
英語
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OAI-PMH Set |
岡山大学
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論文のバージョン | author
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DOI | |
Web of Science KeyUT | |
関連URL | isVersionOf https://doi.org/10.1039/D0TA04005C
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助成機関名 |
日本学術振興会
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助成番号 | 17K06017
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