The design of novel materials for portable energy sources (e.g., batteries) relies on the understanding of the microscopic mechanisms governing their charge, mass, and heat transport. In this respect ionic liquids and polymer electrolytes are well investigated. However, information on the emerging class of polymerized ionic liquids - with one type of ions mobile while the counter ions are attached to the polymer chain [1] - is still sparse, largely due to the fact that these compounds are not yet commercially available. The striking difference between the dynamics of anions and cations renders these materials as particularly interesting: Since only one type of ions governs their conductivity, they are well suited for technological applications and on the same time are perfect testing grounds for theoretical approaches of charge transport and of polymer dynamics in general. In this work we employ dielectric spectroscopy, rheology, and field-gradient nuclear magnetic resonance to analyze the variation in the conducting and viscoelastic behavior induced by a systematic increase of the chain length in such polymers [2]. We demonstrate that, surprisingly, a significant decoupling between the dynamics of positive and negative charges occurs already for short chains and that a recently introduced approach is able to estimate their ion diffusivity without any adjustable parameters [3]. Considering the perspective of these materials being exploited in nanobatery technology, we also investigated their behavior under large electric fields revealing, among other interesting features, the presence of a transient dissipation of electric energy governed by the local rearrangement of polymeric segments [4].<br/><br/>

Conductivity and mechanical behavior of ionic melts

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.