Project/Area Number |
22KF0115
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Project/Area Number (Other) |
22F22340 (2022)
|
Research Category |
Grant-in-Aid for JSPS Fellows
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Allocation Type | Multi-year Fund (2023) Single-year Grants (2022) |
Section | 外国 |
Review Section |
Basic Section 36020:Energy-related chemistry
|
Research Institution | The University of Tokyo |
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)
|
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
|
Project Period (FY) |
2023-03-08 – 2025-03-31
|
Project Status |
Granted (Fiscal Year 2023)
|
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)
|
Keywords | Li-ion batteries / Anode-free batteries / Metallic lithium / LiPF6 |
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 |
An exploratory study was performed in which several suitable carbonate and ether solvents were identified for a LiPF6 based electrolyte compatible with a lithium metal anode. For the ethers, which are generally incompatible with LiPF6, new electrolyte preparation methods and cell configurations were developed. The electrolytes were further optimized through solvation structure regulation by increasing the salt concentration and additives, which presumably leads to an improved (i.e. thin, inorganic) solid electrolyte interphase on the lithium anode (yet to be characterized). The obtained Coulombic efficiencies and cycle lifetimes are comparable with the state-of-the-art performance for electrolytes based on expensive salts (e.g. LiFSI) that are (contrary to LiPF6) not commercially viable.
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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
More potential high performance electrolyte systems were found/developed than expected during the first 6-month period. As a consequence, less time will have to be spent on further exploration/optimization, which means that the characterization of the metallic anode (and interphase) and the mechanistic study of the electrolytes can start sooner than planned.
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Strategy for Future Research Activity |
To improve costs, viscosity and performance of the electrolytes, development of localized highly concentrated electrolytes with the use of cost effective diluents will be pursued. The solvation structure of these novel electrolytes will be studied with spectroscopy and DFT calculations. After cycling the morphology and elemental composition of electrodes will be characterized with microscopy and spectroscopy. With these studies we hope to apply the recent breakthroughs in understanding the influence of the solvation structure and lithium electrode potential on the cell performance for the development of practical electrolytes to improve high energy density batteries.
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