| 研究課題/領域番号 |
22K14757
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| 研究機関 | 東北大学 |
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研究代表者 |
YU WEI 東北大学, 材料科学高等研究所, 特任助教 (10900904)
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| 研究期間 (年度) |
2022-04-01 – 2024-03-31
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| キーワード | Topological Defect / Carbon Material / Lithium-Oxygen Battery |
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| 研究実績の概要 |
Content: Topological-defect-rich and edge-site-free graphene mesosponge (GMS) was successfully synthesized by chemical vapor deposition. The properties of GMS were characterized by X-ray diffraction, nitrogen adsorption-desorption, Raman spectroscopy, and temperature-programmed desorption. Lithium-oxygen battery performance was evaluated using cyclic voltammetry and discharge-charge tests. The discharge-charge mechanism was investigated by quantitative and qualitative methods. Importance: for the first time, we confirmed the abundant existence of topological defects on GMS through comprehensive characterizations. Moreover, the catalytic effect of topological defects in Li-O2 batteries was estimated without the influence of edge sites, which was not achieved in previous reports.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
In previous plan, I need to focus on the synthesis of the carbon material and the textural characterizations in the first year. So far, the synthesis of GMS has already been completed. By carefully selecting the fabrication conditions, a better understanding of how the synthesis conditions affect the final structure of the carbon materials is achieved. The electrochemical performance provides a clear direction for the selection of good carbon materials for Li-O2 batteries. I also completed part of the second year plan. The battery based on GMS cathode was assembled and the performance was compared with commercial carbon references. Also, construction of an in situ DEMS system to study the reaction mechanism was completed. Preliminary tests confirmed the stability of the system.
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| 今後の研究の推進方策 |
In the following work, I will perform comprehensive characterizations on Li-O2 batteries based on GMS cathodes, including the study of electrochemical cycle stability and reaction mechanism. Free-standing GMS-sheet without organic/inorganic binders will be synthesized for practical Li-O2 batteries with high energy density and long cycle stability. The development of advanced isotope DEMS technique to distinguish the side reaction of cathode and electrolyte is the key to deepen the understanding of the reaction mechanism. I plan to publish several papers presenting our results on rational design of carbon cathodes for advanced batteries.
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| 次年度使用額が生じた理由 |
I concelled the trip to London for Carnon2022 last July. The planned flight fee to London will be used next fiscal year for the trip to Cancun, Mexico for the Carbon2023.
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