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.
Attached Files
Name
Description
MIMEType
Size
Downloads
Title
Surprising effect of nanoparticle inclusion on ion conductivity in a lithium doped organic ionic plastic crystal
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.
Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.