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CARBON-BASED BIPOLAR PLATES FOR VANADIUM REDOX FLOW BATTERIES

Citace:
PECHA, M., VRÁNA, J., MAZÚR, P., POCEDIČ, J., DUNDÁLEK, J., KOSEK, J. CARBON-BASED BIPOLAR PLATES FOR VANADIUM REDOX FLOW BATTERIES. In Workshop of student´s presentation 2015. Česká Lípa: Czech Membrane Platform, 2015. s. 1-11. ISBN: 978-80-904517-4-2
Druh: STAŤ VE SBORNÍKU
Jazyk publikace: eng
Anglický název: CARBON-BASED BIPOLAR PLATES FOR VANADIUM REDOX FLOW BATTERIES
Rok vydání: 2015
Místo konání: Česká Lípa
Název zdroje: Czech Membrane Platform
Autoři: M. Pecha , J. Vrána , Ing. Petr Mazúr Ph.D. , Ing. Jaromír Pocedič Ph.D. , J. Dundálek , J. Kosek
Abstrakt EN: The increasing consumption of electricity brings in higher demands related to producing energy. Getting the energy from renewable power sources seems a good way to cover all demands in the future, however, non-stable and hardly predictable power has been making harder to effectively manage the power transmission level. Larger-scale energy storage is efficient tool allowing stabilization of the power transmission. Vanadium redox flow battery (VRFB) represents interesting solution of stationary energy storage. Despite the fact, development of VRFB has taken a huge step forward, the acquisition costs has still been very high. Carbon bipolar plates (CBP) separate the cells, however, allow electrical connection between them. They are vital for propper function of the whole battery. High electrical conductivity, mechanical stability, long-term chemical resistance against acid vanadium-based electrolytes and the low price are the key parameters of the CBP. The composition and structure of the CBP (i.e. shape, size, orientation and structure of carbon particles) plays the most important role in optimization study. In this work, the development of polypropylene-carbon composite bipolar plates is introduced. The electrical resistance of the composite and of the bipolar plate was measured in this work. The method of longitudinal resistance measurement is 4-electrode resistance measurement of samples with negligible width and height in comparison to their length. The narrow samples of the CBP were prepared by milling in various directions to provide better characterization of the CBP. The method for measurement of the cross resistance is based on 4-electrode resistance measurement between copper electrodes, carbon felts and the CBP in sandwich arrangement reflecting the assembly in VRFB. Cross and longitudial resistivity of the commercial CBP measured by our apparatuses was comparable with the values declared by manufacturer.
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