| 研究課題/領域番号 |
23KF0021
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 基金 |
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| 応募区分 | 外国 |
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| 審査区分 |
小区分36020:エネルギー関連化学
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| 研究機関 | 東京大学 |
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研究代表者 |
山田 淳夫 東京大学, 大学院工学系研究科(工学部), 教授 (30359690)
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| 研究分担者 |
ZHANG QIU 東京大学, 大学院工学系研究科(工学部), 外国人特別研究員
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| 研究期間 (年度) |
2023-04-25 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
2,400千円 (直接経費: 2,400千円)
2024年度: 1,200千円 (直接経費: 1,200千円)
2023年度: 1,200千円 (直接経費: 1,200千円)
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| キーワード | Zinc batteries / potential shift / Madelung potential / solvation structure |
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| 研究開始時の研究の概要 |
Ultrawide-temperature energy-dense LIBs with fire-extinguishing properties and high temperature independence will be achieved by the synthesis of fluorinated cyclic phosphate with high steric hindrance, optimization of anion, concentration of salt, and composition of mixed solvent. The expected battery can operate at the temperature range of －30°C to 60°C. The molecule design with fluorination and high steric hindrance provides new insights in developing ultrawide-temperature electrolyte. The integration of the full battery will enable the large-scale application.
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| 研究実績の概要 |
Metal plating has drawn lots of attention owing to their high theoretical capacity and low potential for battery applications. In any electrochemical system, the electrochemical potential is the most important part that drives the redox reactions. The potential shift in lithium system was demonstrated by our group with different salt concentrations and solvent species.
In my research, the concept of potential shift was extended to aqueous zinc system. The potential shift of zinc metal can be regulated by different kinds of cations and anions. The huge potential gap of ~0.7 V can be achieved. Most importantly, the relationship among ion species, solvation structure, potential shift was constructed by multi-perspective experiments and theoretical calculations.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The potential shift of zinc metal caused by different salts, composed of different cations and anions, was fully revealed by experiment. There is a clear relationship between the ion species and the potential shift. Furthermore, we tried to understand the science behind the phenomena. By using DFT calculations and molecular dynamics simulations, the micro local structure of zinc cation in the different electrolyte was unveiled. The solvation structure of zinc cation can be affected and involved with different ions. The stability of the structure of zinc cation finally decides the potential shift of zinc metal.
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| 今後の研究の推進方策 |
Although lots of experiments and calculations have been conducted on revealing the underlying science of potential shift of zinc metal in different electrolytes, the state-of-art explanation is not clear enough. The perspective on solvation structure is limited, rather than providing a comprehensive understanding of the electrolyte structure.
So, the next step is to strive for a comprehensive understanding of the potential shift of zinc metal. Madelung potential calculation is demonstrated in the lithium system. We will work on applying this calculation on zinc system.
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