| Project/Area Number |
22KF0115
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| Project/Area Number (Other) |
22F22340 (2022)
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2022) |
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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) |
HARKS PETRUS 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) |
2023-03-08 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2024: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Li-ion batteries / Li-metal batteries / Anode-free batteries / LiPF6, / weak solvation / Metallic lithium / LiPF6 |
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| Outline of Research at the Start |
低炭素社会を実現していくうえで、エネルギーデバイスとしての蓄電池に注目が集まっているが、現行電池材料にはフッ素化合物が用いられている。特に人工的に作られた有機フッ素化合物(PFAS)は近年有害性が指摘されており、今後使用量の増大が確実な蓄電池においては、低フッ素化がキーワードとなりつつある。
本研究は、電池研究において従来必須元素と目されてきたフッ素を、環境負荷の観点からその低減を図りつつ電池性能を追究する。研究期間内においては、特に電解液材料の探索を行う。
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| Outline of Annual Research Achievements |
Current achievements are the elucidation of fundamental aspects of weakly solvating LiPF6 electrolytes and the subsequent development of new, high performing electrolytes. This includes 1.) understanding the implication of the chemical instability of LiPF6 and consequent requirements for the battery cell configuration for this new class of electrolytes. 2.) The principles behind resistance to LiPF6-induced polymerization of ether solvents, obtained through density functional calculation. 3.) The influence of the ether solvents on the solvation structure of Li+, computed by molecular dynamics calculations. These insights open up a new avenue for the development of commercially viable electrolytes for next generation batteries based on Li-metal anodes.
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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
As planned, at this stage most of the experimental work is complete. That is, new electrolytes with enhanced performance have been successfully developed, and were fully characterized (cycling performance in battery cells, ionic conductivity, viscosity etc). Current work focusses on getting a better understanding of the solid electrolyte interphase formation on the Li electrode, as this mechanism is still largely unknown for LiPF6 electrolytes. This includes chemical analysis of the interphase on the Li-anode and calculations on the solvation structures of the electrolytes.
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| Strategy for Future Research Activity |
Current plans involve the finalization of experiments and manuscript preparation to deliver the goals of the project in a timely matter. The last experiments focus on the characterization of the interphase of the Li-anode after cycling in the new electrolytes. The chemical composition will be measured by x-ray absorption spectroscopy and the surface morphology will be studied with scanning electron microcopy. Furthermore, additional Raman spectroscopy measurements on the electrolytes will be performed to further validate and optimize the molecular dynamics and density functional theory calculations.
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