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13 results on '"Butzelaar, Andreas J."'

3. Impact of Nano‐sized Inorganic Fillers on PEO‐based Electrolytes for Potassium Batteries.

Author

Khudyshkina, Anna D., Rauska, Ulf‐Christian, Butzelaar, Andreas J., Hoffmann, Maxi, Wilhelm, Manfred, Theato, Patrick, and Jeschull, Fabian

Subjects
POLYELECTROLYTES, ELECTROLYTES, SOLID electrolytes, POLYMERS, PRUSSIAN blue, MELTING points, LITHIUM cells, POTASSIUM ions
Abstract

The low melting points of solid polymer electrolytes (SPEs) based on the KTFSI electrolyte salt allow comparatively low operation temperatures (below 50 °C) for K‐ion batteries, unlike their Li or Na counterparts. Unfortunately, for this reason the electrolyte is also rendered mechanically unsuitable in its function to act as a cell separator. Therefore, in this work the use of inorganic nanofillers (Al2O3 and SiO2) is explored with the aim to improve rheological, thermal and cation transport properties of the resulting polymer composite electrolytes. Their electrochemical properties were further examined in K‐metal symmetrical cells and K‐metal/SPE/K2Fe[Fe(CN)6] cells and compared to corresponding liquid electrolyte systems. As a result of particle‐polymer interactions, filler‐containing SPEs showed higher degrees of crystallinity combined with filler polymer interaction and thus improved mechanical integrity in the relevant temperature range of 25–55 °C, while maintaining similar ionic conductivities than a filler‐free sample above the melting temperature. Although plating‐stripping experiments in symmetrical cell setups suggested high cell resistances for various compositions and in some cases even rapid cell failure, Al2O3‐based SPEs generally displayed high capacity retention when cycled against a positive electrode (here Prussian blue analogue K2Fe[Fe(CN)6]) over 100–160 cycles and possibly beyond. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Improved Route to Linear Triblock Copolymers by Coupling with Glycidyl Ether-Activated Poly(ethylene oxide) Chains

Author

Krause, Daniel T., primary, Krämer, Susanna, additional, Siozios, Vassilios, additional, Butzelaar, Andreas J., additional, Dulle, Martin, additional, Förster, Beate, additional, Theato, Patrick, additional, Mayer, Joachim, additional, Winter, Martin, additional, Förster, Stephan, additional, Wiemhöfer, Hans-Dieter, additional, and Grünebaum, Mariano, additional

Published
2023
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13. Degradation of Styrene-Poly(ethylene oxide)-Based Block Copolymer Electrolytes at the Na and K Negative Electrode Studied by Microcalorimetry and Impedance Spectroscopy

Author

Xing, Silin, Khudyshkina, Anna, Rauska, Ulf-Christian, Butzelaar, Andreas J., Voll, Dominik, Theato, Patrick, Tübke, Jens, and Jeschull, Fabian

Abstract

The electrode-electrolyte interface of alkali metal electrodes and solid polymer electrolytes (SPE) is challenging to access because solid electrolytes are difficult to remove without damaging the interphase region. Herein, the two non-invasive techniques isothermal microcalorimetry (IMC) and electrochemical impedance spectroscopy (EIS) are combined to explored degradation processes of reactive sodium and potassium metal electrodes in contact with SPEs. Comparison of the parasitic heat flows and interfacial resistances at different current densities with a liquid electrolyte (LE) system showed marked differences in aging behaviour. The data also suggest that the electrochemically active surface area of alkali metal electrodes increase with cycling, leading to larger parasitic heat flows and indicating morphological changes. SPE-based cells exhibit similar levels of parasitic heat flow at different current densities, which is in stark contrast to the LE cell where a strong correlation between the two is evident. The ambiguity of EIS spectra is challenging due to the overlapping time constants of the underlying electrode processes. However, equivalent circuit modelling can be used to follow trends in resistance evolution, for example to track the rapidly increasing cell impedance in K/K symmetric cells during a 48 h equilibration interval prior to cycling, which abruptly disappeared once cycling begins.

Published
2024
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