Surprising effect of nanoparticle inclusion on ion conductivity in a lithium doped organic ionic plastic crystal

Shekibi, Youssof, Pas, Steven J., Rocher, Nathalie M., Clare, Bronya R., Hill, Anita J., MacFarlane, Douglas R. and Forsyth, Maria 2009, Surprising effect of nanoparticle inclusion on ion conductivity in a lithium doped organic ionic plastic crystal, Journal of materials chemistry, vol. 19, no. 11, pp. 1635-1645, doi: 10.1039/B814175D.

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Title Surprising effect of nanoparticle inclusion on ion conductivity in a lithium doped organic ionic plastic crystal
Author(s) Shekibi, Youssof
Pas, Steven J.
Rocher, Nathalie M.
Clare, Bronya R.
Hill, Anita J.
MacFarlane, Douglas R.
Forsyth, MariaORCID iD for Forsyth, Maria
Journal name Journal of materials chemistry
Volume number 19
Issue number 11
Start page 1635
End page 1645
Total pages 11
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 2009
ISSN 0959-9428
Summary Doping 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.
Language eng
DOI 10.1039/B814175D
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Royal Society of Chemistry
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