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The influence of the size and symmetry of cations and anions on the physicochemical behavior of organic ionic plastic crystal electrolytes mixed with sodium salts

journal contribution
posted on 21.02.2018, 00:00 authored by F Makhlooghiazad, J Guazzagaloppa, Luke O'DellLuke O'Dell, Ruhamah Yunis, Andrew Basile, Patrick HowlettPatrick Howlett, Maria ForsythMaria Forsyth
The phase behaviour, ionic conductivity, electrochemical stability and diffusion coefficients of mobile components in three organic ionic plastic crystals (OIPCs): triisobutylmethylphosphonium bis(fluorosulphonyl)amide (P1i444FSI), triisobutylmethylphosphonium bis(trifluromethanesulphonyl)amide (P1i444NTf2) and trimethylisobutylphosphonium bis(trifluoromethanesulphonyl)amide (P111i4NTf2) are compared to study the effect of the anions and cations on phase behaviour and dynamics. The FSI-based OIPC shows lower melting point and higher conductivity values most likely because of the higher degree of charge distributions and weaker ion-ion interactions compared to NTf2 anion-based OIPCs. Cyclic voltammetry of electrolytes consisting of these OIPCs with 70 mol% sodium salt incorporated indicates stable sodium plating/stripping behaviour at 70 and 50 °C for all samples. The magnitude of the peak currents, however, are much higher for the FSI-based electrolyte.

History

Journal

Physical chemistry chemical physics

Volume

20

Issue

7

Pagination

4721 - 4731

Publisher

Royal Society of Chemistry

Location

Cambridge, Eng.

eISSN

1463-9084

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

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