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Surprising effect of nanoparticle inclusion on ion conductivity in a lithium doped organic ionic plastic crystal
journal contribution
posted on 2009-01-01, 00:00 authored by Y Shekibi, S Pas, N Rocher, B Clare, A Hill, D MacFarlane, Maria ForsythMaria ForsythDoping lithium bis(trifluoromethanesulfonyl)amide (Li[NTf2]) into the N-ethyl,N′-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide ([C2mpyr][NTf2]) plastic crystal material has previously indicated order of magnitude enhancements in ion transport and conductivity over pure [C2mpyr][NTf2]. Recently, conductivity enhancements in this ionic plastic crystal induced by SiO2 nanoparticles have also been reported. In this work the inclusion of SiO2 nanoparticles in Li ion doped [C2mpyr][NTf2] has been investigated over a wide temperature range by differential scanning calorimetry (DSC), impedance spectroscopy, positron annihilation lifetime spectroscopy (PALS), Raman spectroscopy, NMR spectroscopy and scanning electron microscopy (SEM). Solid state 1H NMR indicates that the addition of the nanoparticles increases the mobility of the [C2mpyr] cation and positron lifetime spectroscopy (PALS) measurements indicate an increase in mean defect size and defect concentration as a result of nanoparticle inclusion, especially with 10 wt% SiO2. Thus, the substantial drop in ion conductivity observed for this doped nanocomposite material was surprising. This decrease is most likely due to the decrease in mobility of the [NTf2] anion, possibly by its adsorption at the SiO2/grain boundary interface and concomitant decrease in mobility of the Li ion.
History
Journal
Journal of materials chemistryVolume
19Issue
11Pagination
1635 - 1645Publisher
Royal Society of ChemistryLocation
Cambridge, EnglandPublisher DOI
ISSN
0959-9428eISSN
1364-5501Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2009, Royal Society of ChemistryUsage metrics
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