2023 Fiscal Year Research-status Report
| Project/Area Number |
22KF0115
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| Allocation Type | Multi-year Fund |
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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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| Keywords | Li-ion batteries / Li-metal batteries / Anode-free batteries / LiPF6, / weak solvation |
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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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