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Gelled ionic liquid sodium ion conductors for sodium batteries
journal contribution
posted on 2015-07-01, 00:00 authored by S A Mohd Noor, Martin Yoon, Maria ForsythMaria Forsyth, D R MacfarlaneOwing to the unique properties of certain Ionic liquids (ILs) as safe and green solvents, as well as the potential of sodium as an alternative to lithium as charge carriers, we investigate gel sodium electrolytes as safe, low cost and high performance materials with sufficient mechanical properties for application in sodium battery technologies. We investigate the effect of formation of two types of gel electrolytes on the properties of IL electrolytes known to support Na/Na+ electrochemistry. The ionic conductivity is only slightly decreased by 0.0005 and 0.0002 S cm-1 in the case of 0.3 and 0.5 M NaNTf2 systems respectively as the physical properties transition from liquid to gel. We observed facile plating and stripping of Na metal around 0 V vs. Na/Na+ through the cyclic voltammetry. A wide-temperature range of the gelled IL state, of more than 100 K around room temperature, is achieved in the case of 0.3 and 0.5 M NaNTf2. We conclude that the formation of a gel does not significantly affect the liquid-like ion dynamics in these materials, as further evidenced by DSC and FTIR analysis.
History
Journal
Electrochimica actaVolume
169Pagination
376 - 381Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0013-4686eISSN
1873-3859Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
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