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Imidazolium-Based Ionic Liquid Electrolytes for Fluoride Ion Batteries.

Omar Alshangiti1, Giulia Galatolo1, Camilla Di Mino1

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Researchers developed a stable liquid electrolyte for fluoride-ion batteries (FIBs) using a novel ionic liquid. This breakthrough enables high-voltage operation, overcoming key challenges in anionic battery technology.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Fluoride-ion batteries (FIBs) offer high theoretical energy density without critical minerals.
  • Developing stable liquid electrolytes for FIBs is challenging due to low fluoride salt solubility and ion reactivity.

Purpose of the Study:

  • To create a chemically stable and highly soluble electrolyte for high-voltage fluoride-ion batteries.
  • To investigate the solvation structure and stability of fluoride ions in the novel electrolyte.

Main Methods:

  • Utilized a novel electrolyte composed of 1,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide ([MMIm][TFSI]) and tetramethylammonium fluoride (TMAF).
  • Employed NMR spectroscopy and neutron total scattering to analyze fluoride solvation and interactions.
  • Measured electrochemical stability window (ESW) and ionic conductivity.

Main Results:

  • Achieved an electrochemical stability window (ESW) of 4.65 V.
  • Obtained an ionic conductivity of 9.53 mS cm and a fluoride salt solubility of 0.67 m.
  • NMR and neutron scattering revealed fluoride solvation dominated by electrostatic interactions, indicating stability of the [MMIm] cation.

Conclusions:

  • The developed electrolyte demonstrates excellent chemical stability and high solubility for fluoride ions.
  • The [MMIm][TFSI] based electrolyte shows significant potential for enabling high-voltage fluoride-ion batteries.
  • This work addresses critical challenges in liquid electrolyte development for advanced anionic battery systems.