| Project/Area Number |
23KF0021
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 外国 |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2023-04-25 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2024: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2023: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Zinc batteries / potential shift / Madelung potential / solvation structure |
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| Outline of Research at the Start |
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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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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