Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Charged Soft Matter, Polyelectrolytes and Ionic Liquid
CPP 13.6: Talk
Tuesday, September 6, 2022, 11:00–11:15, H38
Tuning the Electronic and Ionic Thermoelectric Transport Properties in Polymer Electrolytes by Carbon Based Additives — •Maximilian Frank1 and Jens Pflaum1,2 — 1Experimental Physics VI, University of Würzburg, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
Ionic transport constitutes a key process in organic-based electrochemical energy storage media. As such, it also offers intriguing possibilities for the utilization of these materials in thermoelectrics (TE) to recuperate waste heat into electrical power. In this work we present our results on the electrical and thermoelectrical characterization of a methacrylate based solution processable solid polymer electrolyte. By means of impedance spectroscopy over a broad frequency regime from 100 mHz up to 500 kHz and in a technologically relevant temperature range between 263 K and 363 K we investigate the dynamics of charge carriers in the solidified electrolyte. Furthermore, we demonstrate that the electronic and ionic transport properties can be efficiently varied by the ratio between Lithium-salt and carbon-based additives, in this case, carbon nanotubes. Even more, we can reverse the sign of the occurring thermovoltage, which allows for different TE operational modes depending on ambient temperature. A proof-of-concept all organic TEG verifies the functionality of our approach and, thereby, substantiates the potential of mixed ionic and electronic materials for future TE applications.