2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 9 Mizutani Intl. Symp. Science of Intelligent & Advanced Materials (SISAM) and Quasi-crystals
| Editors: | F. Kongoli, J. Dubois, E. Gaudry, T. Homma, V. Fournee |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2022 |
| Pages: | 116 pages |
| ISBN: | 978-1-989820-50-6(CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Challenges for fluoride-ion conductors: Designing fluoride-ion conduction into layered materials
Tsuyoshi Takami1;1KYOTO UNIVERSITY, Kyoto, Japan;
Type of Paper: Invited
Id Paper: 393
Topic: 42
Abstract:
The fluorine atom, the second smallest after the hydrogen atom, is characterized by its large electronegativity and small polarizability [1]. Thus, it has little effect on the crystal structure, even though it causes a large electron bias in materials. Because of these unique properties, the fluorine atom is called as ‘magic element’. Fluorine has brought tremendous benefits to our lives through heat-resistant plastics, pharmaceuticals, and pesticides.
The oxidation reaction of fluoride ions with a high redox potential is also promising as fluoride-ion batteries. If a solid electrolyte with a sufficient high fluoride-ion conductivity is applied to all-solid-state FIBs, operation at room temperature would become possible. PbSnF4 with a layered structure exhibits a superionic conductivity (> 10-3 Scm-1) at room temperature [2]. Besides it contains harmful lead in the crystal, however, it has a poor reduction resistance and there have been few reports of its incorporation into batteries. Recently, single crystals of fluorinated hexagonal BN were reported to exhibit a high in-plane fluoride-ion conductivity of 0.2 Scm-1 at room temperature [3]. These reports propose that two-dimensional fluoride-ions diffusion is effective to enhance fluoride-ion conduction. In this lecture, we survey the core design principles that guide a high fluoride-ion conductivity. We conclude with a forward-looking discussion of the exciting link between fluoride-ions diffusion and layered structures in fluoride materials.
Keywords:
Advanced materials; Energy applications; Ionic conductorsReferences:
[1] S. Dehnen, L. L. Schafer, T. Lectka, and A. Togni, Org. Lett. 23, 9013 (2021).[2] J. M. Reau, C. Lucat, J. Portier, P. Hagenmuller, L. Cot, and S. Vilminot, Mater. Res. Bull. 13, 877 (1978).
[3] T. Takami, T. Saito, T. Kamiyama, K. Kawahara, T. Fukunaga, and T. Abe, Materials Today Physics 21, 100523 (2021).