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タイトル: | Structural characterization of an amorphous VS₄ and its lithiation/delithiation behavior studied by solid-state NMR spectroscopy |
著者: | Shimoda, Keiji https://orcid.org/0000-0003-4600-3437 (unconfirmed) Koganei, Kazuto Takeuchi, Tomonari Matsunaga, Toshiyuki Murakami, Miwa https://orcid.org/0000-0001-6209-4450 (unconfirmed) Sakaebe, Hikari Kobayashi, Hironori Matsubara, Eiichiro |
著者名の別形: | 下田, 景士 松永, 利之 村上, 美和 松原, 英一郎 |
発行日: | 2019 |
出版者: | Royal Society of Chemistry (RSC) |
誌名: | RSC Advances |
巻: | 9 |
号: | 41 |
開始ページ: | 23979 |
終了ページ: | 23985 |
抄録: | Vanadium sulfide (VS₄) is one of the promising positive electrode materials for next-generation rechargeable lithium-ion batteries because of its high theoretical capacity (1196 mA h g⁻¹). Crystalline VS₄ has a unique structure, in which the Peierls-distorted one-dimensional chains of V-V bonds along the c axis are loosely connected to each other through van der Waals interactions. In this study, an amorphous VS₄ is prepared by mechanical milling of the crystalline material, and its lithiation/delithiation behavior is investigated by solid-state nuclear magnetic resonance (NMR) spectroscopy. The amorphous VS₄ shows a chain structure similar to that of crystalline VS₄. The amorphous host structure is found to change drastically during the lithiation process to form Li₃VS₄: the V ions become tetrahedrally coordinated by S ions, in which the valence states of V and S ions simultaneously change from V⁴⁺ to V⁵⁺ and S⁻ to S²⁻, respectively. When the Li insertion proceeds further, the valence state of V ions is reduced. After the 1[st] cycle, the amorphous VS₄ recovers to the chain-like structure although it is highly disordered. No conversion to elemental V is observed, and a high capacity of 700 mA h g⁻¹ is reversibly delivered between 1.5 and 2.6 V. |
著作権等: | © The Royal Society of Chemistry 2019 This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. |
URI: | http://hdl.handle.net/2433/269541 |
DOI(出版社版): | 10.1039/C9RA04338A |
PubMed ID: | 35530591 |
出現コレクション: | 学術雑誌掲載論文等 |
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