Study of membranes and monitoring of electrolyte composition for vanadium redox flow battery

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

Study of membranes and monitoring of electrolyte composition for vanadium redox flow battery

Popis výsledku v původním jazyce

The high proportion of electricity from intermittent renewable sources is a strongly motivating factor for the development of modern stationary energy storage, which can help to stabilize electricity grid and increase percentage of used renewable energy sources. Vanadium redox flow battery seems to be a good technology for stationary energy storage due to easily extendable capacity (energy stored in external tanks), power vs. capacity flexibility, high efficiency and long-term durability. As a concept the vanadium redox flow battery works well but the limiting factor for its large-scale commercialization are high investment costs of the system and conservative energy market. Ion exchange membranes, which separate positive and negative electrolyte in battery stack, significantly contribute to the overall costs of the system. At the same time, membrane properties significantly influence the operating parameters of the battery, such as energy efficiency and capacity decline. An experimental study of commercially available perfluorosulphonated membranes was carried out in this work. Diffusion tests of various vanadium ions across the membrane and characterization of these membranes by charge/discharge cycles in a laboratory battery single cell under at controlled conditions were the main methods for membrane characterization. Obtained results contribute to the understanding how the different parameters of the membrane (thickness, ion exchange capacity, inner structure) affect the properties of the battery. The second aim of this work was to develop a battery monitoring system that allows to determine the actual state of charge of the battery by the analysis of electrolyte by means of several cheap and common analytical techniques. Results measured with chemically pure electrolytes will be used for the calibration of the monitoring system that will be installed in the pilot-scale battery with power rating of 2 kW and capacity of 10 kWh.

Název v anglickém jazyce

Study of membranes and monitoring of electrolyte composition for vanadium redox flow battery

Popis výsledku anglicky

The high proportion of electricity from intermittent renewable sources is a strongly motivating factor for the development of modern stationary energy storage, which can help to stabilize electricity grid and increase percentage of used renewable energy sources. Vanadium redox flow battery seems to be a good technology for stationary energy storage due to easily extendable capacity (energy stored in external tanks), power vs. capacity flexibility, high efficiency and long-term durability. As a concept the vanadium redox flow battery works well but the limiting factor for its large-scale commercialization are high investment costs of the system and conservative energy market. Ion exchange membranes, which separate positive and negative electrolyte in battery stack, significantly contribute to the overall costs of the system. At the same time, membrane properties significantly influence the operating parameters of the battery, such as energy efficiency and capacity decline. An experimental study of commercially available perfluorosulphonated membranes was carried out in this work. Diffusion tests of various vanadium ions across the membrane and characterization of these membranes by charge/discharge cycles in a laboratory battery single cell under at controlled conditions were the main methods for membrane characterization. Obtained results contribute to the understanding how the different parameters of the membrane (thickness, ion exchange capacity, inner structure) affect the properties of the battery. The second aim of this work was to develop a battery monitoring system that allows to determine the actual state of charge of the battery by the analysis of electrolyte by means of several cheap and common analytical techniques. Results measured with chemically pure electrolytes will be used for the calibration of the monitoring system that will be installed in the pilot-scale battery with power rating of 2 kW and capacity of 10 kWh.

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

Workshop of Students' Prezentations 2016 "Membranes and Membrane Processes"

ISBN

978-80-904517-8-0

ISSN

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e-ISSN

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Počet stran výsledku

13

Strana od-do

1-13

Název nakladatele

Česká membránová platforma

Místo vydání

Česká Lípa

Místo konání akce

Stráž pod Ralskem

Datum konání akce

12. 10. 2016

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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