Imidazolium-Based Ionic Liquid Electrolytes for Fluoride Ion Batteries.

Autor:	Alshangiti O; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom., Galatolo G; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom., Di Mino C; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom., Headen TF; ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom., Christianson J; Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom., Merotto S; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom., Rees GJ; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom., Delavoux Y; The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast, BT9 5AG, Northern Ireland, United Kingdom., Swadźba-Kwaśny M; The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast, BT9 5AG, Northern Ireland, United Kingdom., Pasta M; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom.
Jazyk:	angličtina
Zdroj:	ACS energy letters [ACS Energy Lett] 2024 Nov 27; Vol. 9 (12), pp. 6104-6108. Date of Electronic Publication: 2024 Nov 27 (Print Publication: 2024).
DOI:	10.1021/acsenergylett.4c02663
Abstrakt:	The fluoride-ion battery (FIB) is a post-lithium anionic battery that utilizes the fluoride-ion shuttle, achieving high theoretical energy densities of up to 1393 Wh L -1 without relying on critical minerals. However, developing liquid electrolytes for FIBs has proven arduous due to the low solubility of fluoride salts and the chemical reactivity of the fluoride ion. By introducing a chemically stable electrolyte based on 1,3-dimethylimidazolium [MMIm] bis(trifluoromethanesulfonyl)imide [TFSI] and tetramethylammonium fluoride (TMAF), we achieve an electrochemical stability window (ESW) of 4.65 V, ionic conductivity of 9.53 mS cm - 1 , and a solubility of 0.67 m. The origin of this high solubility and the solvation structure were investigated using NMR spectroscopy and neutron total scattering, showing a fluoride solvation driven by strong electrostatic interactions and weak hydrogen bonding without covalent H-F character. This indicates the chemical stability of 1,3-dimethylimidazolium toward the fluoride ion and its potential as an electrolyte for high-voltage FIBs. Competing Interests: The authors declare no competing financial interest. (© 2024 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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