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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Charged Soft Matter, Polyelectrolytes and Ionic Liquid

CPP 53.7: Vortrag

Donnerstag, 30. März 2023, 17:00–17:15, ZEU 255

Comparative Study of Thermoelectric Transport Properties of Lithium- and Sodium-based Solid Polymer Electrolytes and their Tuning by Carbon-based Additives — •Maximilian Frank, Julian-Steven Schilling, and Jens Pflaum — Experimental Physics VI, University of Würzburg, 97074 Würzburg

Due to the high abundance of their atomic constituents, solution as well as easily scalable processing, and intrinsically low thermal conductivity, organic polymers have gained much attention for potential thermoelectric applications. In particular, ionic systems can generate significantly higher thermal voltages than electronic materials. In this work, we will compare our previous findings [1] on the electrical and thermoelectric transport properties of a solution-processed methacrylate-based solid polymer electrolyte with new results obtained by variation of the conducting salt. Using impedance spectroscopy in a broad frequency range from 100 mHz to 510 kHz in a temperature range between 263 K and 353 K and by means of thermoelectric voltage measurements, we deduced the essential concentration-related differences in the application of LiTFSI and NaTFSI as conducting salts. As an extension, we demonstrate the possibility to efficiently tune the transport properties of these polymer electrolytes by carbon-based additives, which differ in their conductivity characteristics (semiconducting or metallic, 1D or 2D). A proof-of-concept thermoelectric generator verifies the functionality of our approach and substantiates the potential of mixed ionic and electronic materials for future TE applications. [1] M. Frank, J. Pflaum, Adv. Funct. Mater. 2022.