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Open AccessFeature PaperArticle

Use of Carbon Additives towards Rechargeable Zinc Slurry Air Flow Batteries

1
Applied Electrochemistry, Fraunhofer Institute for Chemical Technology ICT, Joseph-von-Fraunhofer, Straße 7, 76327 Pfinztal, Germany
2
Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology KIT, Straße am Forum 8, 76131 Karlsruhe, Germany
3
Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 5, 16628 Prague 6, Czech Republic
4
CNRS, Grenoble INP, LRP, Institute of Engineering, Univ. Grenoble Alpes, LRP, 38000 Grenoble, France
5
Faculty of Electrical Engineering and Information Technology, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(17), 4482; https://doi.org/10.3390/en13174482
Received: 31 July 2020 / Revised: 19 August 2020 / Accepted: 20 August 2020 / Published: 31 August 2020
(This article belongs to the Special Issue Recent Progress in Metal–Air Batteries)
The performance of redox flow batteries is notably influenced by the electrolyte, especially in slurry-based flow batteries, as it serves as both an ionic conductive electrolyte and a flowing electrode. In this study, carbon additives were introduced to achieve a rechargeable zinc slurry flow battery by minimizing the zinc plating on the bipolar plate that occurs during charging. When no carbon additive was present in the zinc slurry, the discharge current density was 24 mA∙cm−2 at 0.6 V, while the use of carbon additives increased it to up to 38 mA∙cm−2. The maximum power density was also increased from 16 mW∙cm−2 to 23 mW∙cm−2. Moreover, the amount of zinc plated on the bipolar plate during charging decreased with increasing carbon content in the slurry. Rheological investigation revealed that the elastic modulus and yield stress are directly proportional to the carbon content in the slurry, which is beneficial for redox flow battery applications, but comes at the expense of an increase in viscosity (two-fold increase at 100 s−1). These results show how the use of conductive additives can enhance the energy density of slurry-based flow batteries. View Full-Text
Keywords: zinc slurry air flow battery; redox flow battery; zinc-air battery; carbon additives; rheology zinc slurry air flow battery; redox flow battery; zinc-air battery; carbon additives; rheology
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Choi, N.H.; del Olmo, D.; Milian, D.; El Kissi, N.; Fischer, P.; Pinkwart, K.; Tübke, J. Use of Carbon Additives towards Rechargeable Zinc Slurry Air Flow Batteries. Energies 2020, 13, 4482.

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