Deakin University
Browse

Ion Dynamics in a Mixed-Cation Alkoxy-Ammonium Ionic Liquid Electrolyte for Sodium Device Applications

Version 2 2024-06-05, 10:42
Version 1 2016-09-07, 10:35
journal contribution
posted on 2024-06-05, 10:42 authored by CR Pope, Mega KarMega Kar, DR MacFarlane, M Armand, Maria ForsythMaria Forsyth, Luke O'DellLuke O'Dell
The ion dynamics in a novel sodium-containing room-temperature ionic liquid (IL) consisting of an ether-functionalised quaternary ammonium cation and bis(trifluoromethylsulfonyl)amide [NTf2 ] anion with various concentrations of Na[NTf2 ] have been characterised using differential scanning calorimetry, impedance spectroscopy, diffusometry and NMR relaxation measurements. The IL studied has been specifically designed to dissolve a relatively large concentration of Na[NTf2 ] salt (over 2 mol kg(-1) ) as this has been shown to improve ion transport and conductivity. Consistent with other studies, the measured ionic conductivity and diffusion coefficients show that the overall ionic mobility decreases with decreasing temperature and increasing salt content. NMR relaxation measurements provide evidence for correlated dynamics between the ether-functionalised ammonium and Na cations, possibly with the latter species acting as cross-links between multiple ammonium cations. Finally, preliminary cyclic voltammetry experiments show that this IL can undergo stable electrochemical cycling and could therefore be potentially useful as an electrolyte in a Na-based device.

History

Journal

ChemPhysChem

Volume

17

Pagination

3187-3195

Location

Germany

Open access

  • Yes

ISSN

1439-4235

eISSN

1439-7641

Language

English

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2016, Wiley

Issue

20

Publisher

WILEY-V C H VERLAG GMBH