| Project/Area Number |
19K15306
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | Tohoku University |
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Principal Investigator |
DORAI ARUNKUMAR 東北大学, 多元物質科学研究所, 助教 (10814874)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Discontinued (Fiscal Year 2021)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | All solid state battery / Solid Electrolyte / ion dynamics / 19F NMR / All Solid State Battery / Fluoride shuttle / Ionic Conductors / fluoride ion conductors / diffusion coefficient / solid electrolyte |
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| Outline of Research at the Start |
The ion transport properties of a number of fluoride ion conducting solids will be evaluated mainly by 19F-PFG-NMR and impedance spectroscopy to develop all solid state room temperature fluoride ion batteries with high energy density ~ 5000 WhL-1 and high operating potential >5V. The ionic transport properties and ion diffusion mechanism will be identified by comparing the ionic conductivity and diffusion coefficient results. An all solid state fluoride ion battery will be developed using the identified solid electrolyte.
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| Outline of Annual Research Achievements |
Fluoride ion conducting solid electrolytes were suitable for the development of all solid state fluoride ion battery were synthesized using mechanical milling process and the fluoride ion diffusion coefficient is studied using PFG-NMR. The 19F diffusion coefficient for PbSnF4 measured by PFG-NMR was 1 x 10-12 m2/s at 300 degree celcius. PbSnF4 changes structure from beta to gamma phase at high temperatures, the diffusion coefficient measured by PFG-NMR is attributed to the gamma phase of PbSnF4. By varying the Pb/Sn ratio in Pb1-xSnxF4 (x=0.4-0.6), the high temperature gamma phase was prepared at room temperature with an increase in ionic conductivity of 9.4 x 10-4 Scm-1 for x = 0.45 confirmed by ac impedance analysis. Our efforts to measure the diffusion coefficient using PFG-NMR at room temperature was not successful due to the very short T2 relaxation time.
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