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Effect of mixed anions on the physicochemical properties of a sodium containing alkoxyammonium ionic liquid electrolyte

Abstract

The physicochemical properties of the ionic liquid N-ethyl-2-(2-methoxyethoxy)-N,N-bis(2-(2-methoxyethoxy) ethyl) ethan-1-ammonium bis(trifluoromethylsulfonyl) imide (N2(2O2O1)3TFSI) as well as its solutions with sodium bis(trifluoromethylsulfonyl) imide (NaTFSI) and sodium bis(fluorosulfonyl)imide (NaFSI) are compared in order to study the effects of the anion. The NaFSI solutions show weaker interactions as suggested by lower glass transition temperatures, lower densities, lowers viscosities and higher conductivities as compared to their more strongly coordinating NaTFSI analogues. The transport properties follow Vogel-Tamman-Fulcher behaviour suggesting that the mixtures are fragile glass formers. The addition of a higher concentration of Na salts results in decoupling of the translational motion from the viscosity, as observed from Walden plots, and 23Na NMR data suggests that the sodium speciation is independent of the nature of the Na salt or the temperature but is affected by the salt concentration.

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Publication details

The article was received on 18 May 2017, accepted on 19 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP03318D
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Effect of mixed anions on the physicochemical properties of a sodium containing alkoxyammonium ionic liquid electrolyte

    M. Hilder, M. Gras, C. Pope, M. Kar, D. MacFarlane, M. Forsyth and L. A. O'Dell, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP03318D

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