Dielectric relaxation and ionic transport in poly(ethylene carbonate)-based electrolytes
| Autor: | Hidekazu Kodama, Joh Motomatsu, Yoichi Tominaga, Takeo Furukawa |
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| Rok vydání: | 2016 |
| Předmět: |
Permittivity
Materials science Polymers and Plastics Inorganic chemistry Analytical chemistry Ionic bonding 02 engineering and technology Electrolyte Dielectric Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion chemistry.chemical_compound chemistry Ionic conductivity 0210 nano-technology Ethylene carbonate |
| Zdroj: | Polymers for Advanced Technologies. 28:362-366 |
| ISSN: | 1042-7147 |
| DOI: | 10.1002/pat.3896 |
| Popis: | To study the ion-conductive and dielectric properties of polymer electrolytes based on poly(ethylene carbonate) (PEC) with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), the complex permittivity and conductivity were measured using broadband dielectric spectroscopy. The temperature dependence of the relaxation frequency and ionic conductivity for PEC-LiTFSI electrolytes (1 – 200 mol%) indicates that the segmental motion of PEC chains decreases with the addition of just 1 mol% of Li salt and increases with increasing concentration above 10 mol%. According to the Walden rule for PEC-based electrolytes, the value of deviation from the reference line increased, and the fragility and decoupling exponents decreased with increasing salt concentration. These results indicate that there are large numbers of ion pairs and aggregated ions, which imply low ionicity and reduced fragility in highly concentrated PEC-based electrolytes. Copyright © 2016 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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