| 研究課題/領域番号 |
19K15306
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分26040:構造材料および機能材料関連
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| 研究機関 | 東北大学 |
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研究代表者 |
DORAI ARUNKUMAR 東北大学, 多元物質科学研究所, 助教 (10814874)
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| 研究期間 (年度) |
2019-04-01 – 2022-03-31
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| 研究課題ステータス |
中途終了 (2021年度)
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| 配分額 *注記 |
4,290千円 (直接経費: 3,300千円、間接経費: 990千円)
2022年度: 390千円 (直接経費: 300千円、間接経費: 90千円)
2021年度: 650千円 (直接経費: 500千円、間接経費: 150千円)
2020年度: 1,040千円 (直接経費: 800千円、間接経費: 240千円)
2019年度: 2,210千円 (直接経費: 1,700千円、間接経費: 510千円)
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| キーワード | 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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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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