| Project/Area Number |
19J22306
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 国内 |
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| Review Section |
Basic Section 40010:Forest science-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
PAKKANG Nutthira 北海道大学, 農学院, 特別研究員(PD)
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| Project Period (FY) |
2019-04-25 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2021: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2020: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2019: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | ionic liquid / lignin-based electrode / lignin-based separator / fatty acid-based IL / lignin-based EDLC / Lignin / EDLC / ionic liquid electrolyte |
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| Outline of Research at the Start |
Electric double-layer capacitor (EDLC) is a promising energy storage device. So, my objective in this research is to develop parts of EDLC, electrode and electrolyte, to increase energy density by using sustainable woody resources.
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| Outline of Annual Research Achievements |
1. Development of electrolytes from fatty acids of vegetable oils
Linoleic acid was shown to be more suited for usage as electrolytes in both the cation and anion parts than electrolytes made from ricinoleic acid, since the linoleic acid-based electrolytes demonstrated a lower viscosity and a higher conductivity. However, due to its high viscosity, its EDLC capacitance remained low. Propylene carbonate (PC) was added to the electrolytes to lower their viscosity. As expected, an increase in the capacitance of the EDLC was found.
2. Development of EDLC parts, electrode and separator, from hardwood kraft lignin (HKL)
From an electrospun HKL fiber mat, a separator as tHKL separator and two types of electrodes (mat type and power type) can be made. The EDLC was fabricated using a mat type of electrode and a tHKL separator and demonstrated remarkable energy and power densities. Although a powder type electrode requires a casting method to prepare, its EDLC demonstrated excellent electrochemical performance, extremely high power density, low resistances, and good capacitance stability, which were attributed to the powder type electrode's smooth surface and the resulting good contact with the separator.
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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