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Gelled ionic liquid sodium ion conductors for sodium batteries

journal contribution
posted on 01.07.2015, 00:00 authored by S A Mohd Noor, Martin Yoon, Maria ForsythMaria Forsyth, D R Macfarlane
Owing 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 acta

Volume

169

Pagination

376 - 381

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0013-4686

eISSN

1873-3859

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2015, Elsevier