A guanidium salt as a chaotropic agent for aqueous battery electrolytes

John Brown; Juan Forero-Saboya; Benoît Baptiste; Martin Karlsmo; Gwenaëlle Rousse; Alexis Grimaud

doi:10.1039/d3cc03769j

A guanidium salt as a chaotropic agent for aqueous battery electrolytes

Chem Commun (Camb). 2023 Oct 12;59(82):12266-12269. doi: 10.1039/d3cc03769j.

Authors

John Brown^{1

2

3}, Juan Forero-Saboya^{1

2}, Benoît Baptiste⁴, Martin Karlsmo⁵, Gwenaëlle Rousse^{1

2

6}, Alexis Grimaud^{1

2

7}

Affiliations

¹ Chimie du Solide et de l'Energie (CSE), Collège de France, UMR 8260, 75231 Paris Cedex 05, France. grimauda@bc.edu.
² Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459, 80039 Amiens Cedex 1, France.
³ ALISTORE-ERI, CNRS FR 3104, Hub de I'Energie, 80039 Amiens Cedex, France.
⁴ Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), UMR 7590 CNRS - Sorbonne Université - IRD - MNHN, case 115, 4 place Jussieu, 75252 Paris Cedex 5, France.
⁵ Department of Physics, Chalmers University of Technology, 41296, Göteborg, Sweden.
⁶ Sorbonne Université, 4 Place Jussieu, 75005, Paris, France.
⁷ Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA.

PMID: 37750815
DOI: 10.1039/d3cc03769j

Abstract

This study investigates a salt design principle for aqueous battery electrolytes by combining chaotropic ions, guanidium cations (Gdm) and bis(trifluoromethanesulfonyl)imide anions (TFSI), forming GdmTFSI. This salt's crystal structure was solved via single-crystal X-ray diffraction and characterized using Fourier-transform infrared spectroscopy. Study reveals that GdmTFSI salt disrupts the hydrogen bonding network of aqueous solutions, impacting water reactivity at electrochemical interfaces.