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Solvent-in-Salt Electrolytes for Fluoride Ion Batteries

Lookup NU author(s): Dr James Quirk, Dr James DawsonORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2023 The Authors. Published by American Chemical Society.The fluoride ion battery (FIB) is a promising post-lithium ion battery chemistry owing to its high theoretical energy density and the large elemental abundance of its active materials. Nevertheless, its utilization for room-temperature cycling has been impeded by the inability to find sufficiently stable and conductive electrolytes at room temperature. In this work, we report the use of solvent-in-salt electrolytes for FIBs, exploring multiple solvents to show that aqueous cesium fluoride exhibited sufficiently high solubility to achieve an enhanced (electro)chemical stability window (3.1 V) that could enable high operating voltage electrodes, in addition to a suppression of active material dissolution that allows for an improved cycling stability. The solvation structure and transport properties of the electrolyte are also investigated using spectroscopic and computational methods.

Publication metadata

Author(s): Alshangiti O, Galatolo G, Rees GJ, Guo H, Quirk JA, Dawson JA, Pasta M

Publication type: Article

Publication status: Published

Journal: ACS Energy Letters

Year: 2023

Volume: 8

Issue: 6

Pages: 2668-2673

Print publication date: 09/06/2023

Online publication date: 22/05/2023

Acceptance date: 15/05/2023

Date deposited: 12/07/2023

ISSN (electronic): 2380-8195

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acsenergylett.3c00493

DOI: 10.1021/acsenergylett.3c00493

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