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  4. Use of carbon additives towards rechargeable zinc slurry air flow batteries
 
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2020
Journal Article
Titel

Use of carbon additives towards rechargeable zinc slurry air flow batteries

Abstract
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.
Author(s)
Choi, Nak Heon
Fraunhofer-Institut für Chemische Technologie ICT
Olmo, Diego del
Milian, Diego
Kissi, Nadia el
Fischer, Peter
Fraunhofer-Institut für Chemische Technologie ICT
Pinkwart, Karsten
Fraunhofer-Institut für Chemische Technologie ICT
Tübke, Jens
Fraunhofer-Institut für Chemische Technologie ICT
Zeitschrift
Energies
Project(s)
European Training Network to improve materials for high-performance, low-cost next- generation redox-flow batteries
Funder
European Commission EC
DOI
10.3390/en13174482
File(s)
N-615337.pdf (3.08 MB)
Language
English
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Fraunhofer-Institut für Chemische Technologie ICT
Tags
  • zinc slurry air flow battery

  • redox flow battery

  • zinc-air battery

  • carbon additives

  • rheology

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