Microscopic interactions in nanocomposite electrolytes

Best, A.S., Adebahr, J., Jacobsson, P., MacFarlane, D.R. and Forsyth, M. 2001, Microscopic interactions in nanocomposite electrolytes, Macromolecules, vol. 34, no. 13, pp. 4549-4555.

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Title Microscopic interactions in nanocomposite electrolytes
Author(s) Best, A.S.
Adebahr, J.
Jacobsson, P.
MacFarlane, D.R.
Forsyth, M.
Journal name Macromolecules
Volume number 34
Issue number 13
Start page 4549
End page 4555
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2001-06
ISSN 0024-9297
1520-5835
Summary Nanocomposite electrolytes of a fully amorphous trifunctional polyether (3PEG) and poly- (methylene ethylene oxide) (PMEO) have been complexed with two lithium salts and nanoparticulate (~20 nm) fillers of TiO2 and Al2O3. Addition of the fillers to the polymer salt complexes shows a significant change in the conformational modes of both polymers, especially the D-LAM region between 200 and 400 cm-1, indicating a reduced segmental flexibility of the chain. These changes are more pronounced with the use of TiO2 than Al2O3. Incorporation of the nanoparticulate fillers to the electrolytes fails to influence the degree of ion association, suggesting that the number of charge carriers available for conduction in both polymers using both LiClO4 and LiCF3SO3 is not the source of any conductivity increase. Addition of the fillers, which was seen to increase the conductivity in PEO-based systems, generally lowers the conductivity in the present PMEO systems, while the addition of TiO2 has little or no effect except in the cases of 3PEG 1.5 and 1.25 mol/kg LiClO4. In this case, 10 wt % TiO2 provides a conductivity increase of half an order of magnitude at approximately 60 °C. We also report for the first time a Raman spectroscopy investigation into the PEO-based nanocomposite electrolytes. The present results are discussed in terms of the electrostatic interactions involving dielectric properties of the fillers, of special interest being the interactions between the polymer and the fillers and between the ionic species and the fillers, when the effect of crystallization can be ignored.
Language eng
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 ©2001, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030062

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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