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Analysis of electrical properties of ionic-liquid-based polymer electrolytes with respect to their crystallinity
Chválová, Zuzana Lujza ; Holcman, Vladimír (referee) ; Sedlák, Petr (advisor)
Solid polymer electrolytes based on ionic liquids are promising materials to replace conventional liquid electrolytes for electrochemical technologies. This bachelor’s thesis deals with their electrical characterization using dielectric relaxation spectroscopy. Mainly their electrical conductivity is analyzed and the results are described with respect to the different level of the crystalline structure of the electrolytes, caused by different preparation conditions. Subsequently, the work focused on the description of the charge transport mechanism, ion conductivity models, and their verification. The results showed that the crystallinity of the electrolytes decreases with the increase of evaporated solvent, which also leads to an increase in their conductivity. Jonscher type power law, which generally describes charge transport mechanisms in the studied electrolytes, and Dyre’s model, which is suitable for describing conductivity at higher frequencies, were verified.
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