Observation of ionic transport and ion-coordinated segmental motions in composite (polymer-salt-clay) solid polymer electrolyte
| Autor: | Ram S. Katiyar, Dillip K. Pradhan, Tapabrata Dam, Naba K. Karan, Reji Thomas |
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| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymer nanocomposite General Chemical Engineering General Engineering General Physics and Astronomy Ionic bonding Dielectric Polymer Electrolyte Conductivity Electrochemistry chemistry Chemical engineering Electrical resistivity and conductivity Polymer chemistry General Materials Science |
| Zdroj: | Ionics. 21:401-410 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-014-1181-5 |
| Popis: | A solution casting method was successfully used to realize polymer nanocomposite electrolytes consisting of polyethylene oxide as polymer host, lithium hexafluoroarsenate as salt, and dodecylamine modified mont- morillonite clay as filler. Structural studies confirm the inter- calation of polymer-salt complex into the silicate layers of the clay and lithium hexafluoroarsenate salt solvate very well in polyethylene oxide matrix. The electrical conductivity of the polymer-salt-clay composite was higher by more than one order of magnitude than that of the corresponding polymer- salt complex at ambient temperature. Temperature depen- dence of the conductivity was studied using broadband di- electric spectroscopy, it followed Vogel-Tamman-Fulcher trend, which suggests strong coupling between ionic conduc- tivity and segmental relaxation in polymer electrolytes. This phenomenon is correlated with coupling index. Relaxation processes are studied using both dielectric and modulus for- malisms. Additionally, conductivity spectra showed nearly constant loss and universal Jonscher's power law at low and high temperatures, respectively. Crossover from nearly con- stant loss to ion hopping conductivity region is also observed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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