Berlin 2024 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Charged Soft Matter, Polyelectrolytes and Ionic Liquids II

CPP 30.1: Talk

Wednesday, March 20, 2024, 15:00–15:15, H 0107

Dimensionality Effects in the Tuning of Thermoelectric Transport Properties of Polymer Electrolytes by Carbon-based Additives — •Julian-Steven Schilling, Maximilian Frank, Theresa Zorn, Philipp Kessler, Ivonne Vollert, Tobias Hertel, Ann-Christin Pöppler, and Jens Pflaum — University of Würzburg, 97074 Würzburg

The abundance of their chemical constituents, their solution-based processing in combination with the inherently low thermal conductivity have propelled polymers to the forefront of organic thermoelectrics. Since ionic systems exhibit significantly higher thermal voltages than electronic materials, a combinations of material classes seems to be very promising. This study extends our previous findings [1] on the thermoelectric transport properties of a methacrylate-based solid polymer electrolyte prepared by solution processing by new data obtained by changing the conducting salt from LiTFSI to NaTFSI. Employing impedance spectroscopy across a wide frequency range (100 mHz to 510 kHz) together with thermoelectric voltage measurements at technologically relevant temperatures from 263 K to 353 K, we highlight the main concentration-dependent differences resulting from utilization of NaTFSI instead of LiTFSI as conducting salt. Additionally, we demonstrate the potential of tailoring the transport properties of these solid state polymer electrolytes by incorporating carbon-based additives of different dimensionality (1D or 2D) and conductivity characteristics (semiconducting or metallic). [1]M. Frank, et al., Adv. Funct. Mater. 32 (2022) 2203227

Keywords: thermoelectrics; polymer electrolyte; electrochemistry