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タイトル: | Microscopic mechanism of biphasic interface relaxation in lithium iron phosphate after delithiation |
著者: | Kobayashi, Shunsuke Kuwabara, Akihide Fisher, Craig A. J. Ukyo, Yoshio Ikuhara, Yuichi |
著者名の別形: | 右京, 良雄 |
発行日: | 20-Jul-2018 |
出版者: | Springer Nature |
誌名: | Nature Communications |
巻: | 9 |
論文番号: | 2863 |
抄録: | Charge/discharge of lithium-ion battery cathode material LiFePO4 is mediated by the structure and properties of the interface between delithiated and lithiated phases. Direct observations of the interface in a partially delithiated single crystal as a function of time using scanning transmission electron microscopy and electron energy-loss spectroscopy help clarify these complex phenomena. At the nano-scale, the interface comprises a thin multiphase layer whose composition varies monotonically between those of the two end-member phases. After partial delithiation, the interface does not remain static, but changes gradually in terms of orientation, morphology and position, as Li ions from the crystal bulk diffuse back into the delithiated regions. First-principles calculations of a monoclinic crystal of composition Li₂/₃ FePO₄ suggest that the interface exhibits higher electronic conductivity than either of the end-member phases. These observations highlight the importance of the interface in enabling LiFePO₄ particles to retain structural integrity during high-rate charging and discharging. |
著作権等: | © The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
URI: | http://hdl.handle.net/2433/234229 |
DOI(出版社版): | 10.1038/s41467-018-05241-1 |
PubMed ID: | 30030430 |
出現コレクション: | 学術雑誌掲載論文等 |
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