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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
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posted on 2018-02-21, 00:00 authored by F Makhlooghiazad, J Guazzagaloppa, Luke O'DellLuke O'Dell, Ruhamah Yunis, Andrew Basile, Patrick HowlettPatrick Howlett, Maria ForsythMaria ForsythThe 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.
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Journal
Physical chemistry chemical physicsVolume
20Issue
7Pagination
4721 - 4731Publisher
Royal Society of ChemistryLocation
Cambridge, Eng.Publisher DOI
eISSN
1463-9084Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, the Owner SocietiesUsage metrics
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