Development of carbon-based polymer composites as bipolar plates: Understanding the relation between morphology and conductivity

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Development of carbon-based polymer composites as bipolar plates: Understanding the relation between morphology and conductivity

Popis výsledku v původním jazyce

Bipolar plates represent vital structural and functional element of almost every flow battery stack. They separate the cells in terms of electrolyte flow but allow the electrical connection between them. Carbon-based polymer composites represent highly conductive materials with corrosion stability (even in acidic environment) and good mechanical properties at a reasonable price. Due to these properties they are widely used as bipolar plates in many kinds of electrochemical energy convertors Carbon fillers are responsible for the transport of electrons through the material. The resulting conductivity of the composite is strongly influenced by the nature of the carbon-based fillers and their content in the material. In our contribution, we attempt to get a closer insight into the dependence of the electron conductivity of carbon-based composites on their morphology using the combination of mathematical modelling and experimental data. The mathematical model is based on the Poisson's equation and computes the effective conductivity of the composite plate from different conductivities of the matrix and fillers and from the morphology of the plate. This morphology can be either obtained from 3D-reconstructed images of the experimental samples or generated artificially using algorithms for the sphere or fibre deposition. The composites of polypropylene with various fillers (graphite, black, fibres) were prepared using laboratory kneader and subsequent pressing. The effect of the filler content on the electrical conductivity of the composite plate was observed by the measurements of in-plane and through-plane conductivity. The morphology of the composites was observed using AFM, SEM and X-ray micro tomography. The experimentally obtained results were compared with the model predictions.

Název v anglickém jazyce

Development of carbon-based polymer composites as bipolar plates: Understanding the relation between morphology and conductivity

Popis výsledku anglicky

Bipolar plates represent vital structural and functional element of almost every flow battery stack. They separate the cells in terms of electrolyte flow but allow the electrical connection between them. Carbon-based polymer composites represent highly conductive materials with corrosion stability (even in acidic environment) and good mechanical properties at a reasonable price. Due to these properties they are widely used as bipolar plates in many kinds of electrochemical energy convertors Carbon fillers are responsible for the transport of electrons through the material. The resulting conductivity of the composite is strongly influenced by the nature of the carbon-based fillers and their content in the material. In our contribution, we attempt to get a closer insight into the dependence of the electron conductivity of carbon-based composites on their morphology using the combination of mathematical modelling and experimental data. The mathematical model is based on the Poisson's equation and computes the effective conductivity of the composite plate from different conductivities of the matrix and fillers and from the morphology of the plate. This morphology can be either obtained from 3D-reconstructed images of the experimental samples or generated artificially using algorithms for the sphere or fibre deposition. The composites of polypropylene with various fillers (graphite, black, fibres) were prepared using laboratory kneader and subsequent pressing. The effect of the filler content on the electrical conductivity of the composite plate was observed by the measurements of in-plane and through-plane conductivity. The morphology of the composites was observed using AFM, SEM and X-ray micro tomography. The experimentally obtained results were compared with the model predictions.

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

The International Flow Battery Forum 2016 Conference Papers

ISBN

978-0-9571055-6-0

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

138-139

Název nakladatele

Compass Graphic Design Ltd

Místo vydání

Wiltshire

Místo konání akce

Karlsruhe

Datum konání akce

7. 6. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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