File(s) under permanent embargo
Ion transport in polymer electrolytes containing nanoparticulate TiO2 : The influence of polymer morphology
journal contribution
posted on 2003-01-01, 00:00 authored by J Adebahr, A Best, Nolene ByrneNolene Byrne, P Jacobsson, D MacFarlane, Maria ForsythMaria ForsythRecent studies have shown that composite polymer electrolytes, formed by dispersing nanosized ceramic particles in polyether-based electrolytes, have improved ion transport properties as compared to their unfilled analogues. In the present study polymer electrolytes with different loadings of nano-sized ceramic particles (TiO2) and different polymer chemistry and morphology have been investigated. Of special interest are filler induced effects on polymer, solvent and cationic mobility. Partly crystalline polymer electrolytes based on poly(ethylene oxide) have been compared to fully amorphous polymer electrolytes based on a polyether urethane, as well as gel electrolytes based on PMMA. 7Li pfg-NMR, linewidth and spin–spin relaxation times as well as 1H pfg-NMR and spin–spin relaxation times, were measured as a function of temperature and composition. The 1H spin–spin relaxation measurements reveal increased average polymer mobility with the addition of filler up to a maximum at 4 and 8 wt.% TiO2 for the fully amorphous and the partly crystalline electrolytes, respectively. The 7Li linewidth measurements for the fully amorphous system show a broadening of the linewidth with addition of filler. Based on variable temperature measurements this broadening is interpreted as a result of the inhomogeneity introduced by the filler particles. Pulsed field gradient (pfg) diffusion measurements were employed to determine ion and solvent self-diffusion coefficients. In the case of the PMMA-based gel electrolyte and the fully amorphous electrolytes enhanced cation self-diffusion was observed upon addition of TiO2.
History
Journal
Physical chemistry chemical physicsVolume
5Issue
4Pagination
720 - 725Publisher
Royal Society of ChemistryLocation
Cambridge, EnglandPublisher DOI
ISSN
1463-9076eISSN
1463-9084Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2003, Owner SocietiesUsage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC