Communications - Scientific Letters of the University of Zilina 2018, 20(1):82-85 | DOI: 10.26552/com.C.2018.1.82-85

Electrochemical Characterization of High-Performance Sulfur Composites as Cathodes for Li-S Batteries with Application in Automotive Industry

Andrea Strakova Fedorkova1, Katarina Gavalierova1, Dominika Capkova1, Tomas Kazda2
1 Institute of Chemistry, Faculty of Science, P.J. Safarik University, Kosice, Slovakia
2 Department of Electrical and Electronic Technology, Faculty of Electrical Engineering and Communication, Brno University of Technology, Czech Republic

Lithium-sulfur batteries are based on principle of conversion and their properties are very promising for their high theoretical energy density and low cost. However, current electrodes and materials used in Li-S batteries suffer from irreversible electrochemical reaction of polysulfides, low conductivity and stability. Here we summarize preparation and characterization of sulfur samples with polymer additive polypyrrole/polyethylene glycol to improve conductivity and stability of Li-S batteries. We also discuss very simple preparation technique of polypyrrole suitable also for industrial production. The electrochemical properties of sulfur-carbon-polypyrrole (S-C-PPy) composites were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge/discharge measurements. Properties of resulting composite samples (especially conductivity) are strongly affected by the preparation technique and conditions. Insulating polymer PEG was used to improve the polymeric structure and mechanical robustness of PPy chain. Porosity of composite sample increase with increasing amount of PPy. On the other hand conductivity is reduced with increased porosity. Electrochemical measurements confirmed that addition of PEG can improve conductivity also in the presence of higher amounts of PPy in the sample. PPy-PEG composite polymer decrease particle to particle contact resistance. Co-polymer coating consisting of PPy-PEG significantly decreases the charge transfer resistance of prepared samples what was confirmed by impedance measurements.

Keywords: lithium; sulfur; batteries; polypyrrole; conductivity

Published: March 31, 2018  Show citation

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Strakova Fedorkova, A., Gavalierova, K., Capkova, D., & Kazda, T. (2018). Electrochemical Characterization of High-Performance Sulfur Composites as Cathodes for Li-S Batteries with Application in Automotive Industry. Communications - Scientific Letters of the University of Zilina, 20(1), 82-85. doi: 10.26552/com.C.2018.1.82-85
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