Ion dynamics in a mixed-cation alkoxy-ammonium ionic liquid electrolyte for sodium device applications

Pope, Cameron Robert, Kar, Mega, MacFarlane, Douglas R., Armand, Michel, Forsyth, Maria and O'Dell, Luke 2016, Ion dynamics in a mixed-cation alkoxy-ammonium ionic liquid electrolyte for sodium device applications, Chemphyschem, vol. 17, no. 20, pp. 3187-3195, doi: 10.1002/cphc.201600692.

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Title Ion dynamics in a mixed-cation alkoxy-ammonium ionic liquid electrolyte for sodium device applications
Author(s) Pope, Cameron Robert
Kar, Mega
MacFarlane, Douglas R.
Armand, Michel
Forsyth, MariaORCID iD for Forsyth, Maria
O'Dell, LukeORCID iD for O'Dell, Luke
Journal name Chemphyschem
Volume number 17
Issue number 20
Start page 3187
End page 3195
Total pages 9
Publisher Wiley
Place of publication London, Eng.
Publication date 2016-10-18
ISSN 1439-7641
Keyword(s) NMR spectroscopy
ionic conductivity
ionic liquids
sodium electrolytes
Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Summary 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.
Language eng
DOI 10.1002/cphc.201600692
Field of Research 030604 Electrochemistry
030301 Chemical Characterisation of Materials
0306 Physical Chemistry (Incl. Structural)
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
0307 Theoretical And Computational Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID DP130101652
Copyright notice ©2016, Wiley
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