Transport properties of ionic liquid electrolytes with organic diluents

Bayley, Paul M., Lane, George H., Rocher, Nathalie M., Clare, Bronya R., Best, Adam S., MacFarlane, Douglas R. and Forsyth, Maria 2009, Transport properties of ionic liquid electrolytes with organic diluents, Physical chemistry chemical physics, vol. 11, no. 33, pp. 7202-7208, doi: 10.1039/B902200G.

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Title Transport properties of ionic liquid electrolytes with organic diluents
Author(s) Bayley, Paul M.
Lane, George H.
Rocher, Nathalie M.
Clare, Bronya R.
Best, Adam S.
MacFarlane, Douglas R.
Forsyth, MariaORCID iD for Forsyth, Maria
Journal name Physical chemistry chemical physics
Volume number 11
Issue number 33
Start page 7202
End page 7208
Total pages 7
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 2009
ISSN 1463-9076
Summary Ionic liquids (ILs) form a novel class of electrolytes with unique properties that make them attractive candidates for electrochemical devices. In the present study a range of electrolytes were prepared based on the IL N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl) amide ([C3mpyr][NTf2]) and LiNTf2 salt. The traditional organic solvent diluents vinylene carbonate (VC), ethylene carbonate (EC), tetrahydrofuran (THF) and toluene were used as additives at two concentrations, 10 and 20 mol%, leading to a ratio of about 0.6 and 1.3 diluent molecules to lithium ions, respectively. Most promisingly, the lithium ions see the greatest effect in the presence of all the diluents, except toluene, producing a lithium self-diffusion coefficient of almost a factor of 2.5 times greater for THF at 20 mol%. Raman spectroscopy subtly indicates that THF may be effectively breaking up a small portion of the lithium ion–anion interaction. While comparing the measured molar conductivity to that calculated from the self-diffusion coefficients of the constituents indicates that the diluents cause an increase in the overall ion clustering. This study importantly highlights that selective ion transport enhancement is achievable in these materials.
Language eng
DOI 10.1039/B902200G
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Owner Societies
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