Monitoring the state of charge of all-vanadium redox flow batteries to identify crossover of electrolyte

Haisch, Theresa; Ji, Hyunjoon; Weidlich, Claudia

doi:10.1016/j.electacta.2019.135573

Cited by 40 publications

(23 citation statements)

References 32 publications

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“…KG., Meinsberg, Germany) and a glassy carbon rod (SIGRADUR ® G, Hochtemperatur-Werkstoffe GmbH, 2 mm diameter, Thierhaupten, Germany). Further details can be found in previous publications [ 10 , 11 , 14 ].…”

Section: Methodsmentioning

confidence: 99%

“…To enable the determination of electrolyte imbalances in earlier stage as well as to improve the accuracy of SOC calculation, the open circuit potential (OCP) of the positive half-cell (PHC) and negative half-cell (NHC) can be monitored separately [ 10 , 11 , 14 ]. Half-cell SOC can be estimated from OCP measurements via Nernst equation for the PHC (Equation ( 5 )) and PHC (Equation ( 6 )) [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…SOC estimation for the individual half-cells from OCP measurements is suitable for the investigation of crossover characteristics [ 10 , 11 , 14 ]. Based on the monitoring of the individual half-cell SOC, it is also possible to obtain additional information about the character of the crossover regarding direction, relative amount and state of operation.…”

Section: Introductionmentioning

confidence: 99%

“…Accurate and reliable online SOC determination is necessary to improve battery control and to achieve efficient long term operation of the system [7]. A number of methods exist for estimation of the SOC, including potential measurement, UV-Vis spectroscopy, density or conductivity [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Half-Cell State of Charge Monitoring for Determination of Crossover in VRFB—Considerations and Results Concerning Crossover Direction and Amount

Haisch

Holtz

et al. 2021

Membranes

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Membranes play a crucial role in efficiency and longevity of flow batteries. Vanadium flow batteries suffer self-discharge and capacity fading due to crossover of electrolyte components through the membrane from one battery half-cell to the other. We consider the impact of vanadium species crossing ion exchange membranes on state of charge of the battery and we present a simple method to determine crossover characteristics using half-cell open circuit potential measurements. State of charge for the negative and positive half-cell is simulated based on assumptions and simplifications for cation and anion exchange membranes and different crossover parameters. We introduce a crossover index "IndXovr" which enables the determination of crossover direction from state of charge data for the negative and positive half-cell and therewith identification of the half-cell in which predominant self-discharge occurs. Furthermore IndXovr allows statements on crossover amount in dependence on state of operation. Simulated case studies are compared to experimental state of charge values estimated from half-cell potential measurements. Our results reveal that half-cell potential monitoring respectively half-cell SOC estimation, is a simple and suitable tool for the identification of crossover direction and relative amount of crossover in VFB.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Half-Cell State of Charge Monitoring for Determination of Crossover in VRFB—Considerations and Results Concerning Crossover Direction and Amount

Haisch

Holtz

et al. 2021

Membranes

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“…Die theoretische Grenzenergiedichte liegt bei 830 Wh kg −1 . Dieses Redoxsystem enthält somit eine auf Masse, Volumen und Leistung bezogene höhere theoretische Energiedichte als alle derzeit kommerziellen Vergleichssysteme wie Lithium‐Ionen‐Batterien (LIB), Natrium‐Schwefel Batterien (NaS), Salzbatterie oder Redox‐Flow Batterien 8–10 (Tab. 3).…”

Section: Elektrochemisch Nutzbares Redox‐system Für Einen Saisonalen unclassified

Konzept einer autarken elektrischen und thermischen Energieversorgung auf Basis von Photovoltaik

Huber¹,

Machhammer²,

Lepple

et al. 2021

Chemie Ingenieur Technik

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Eine Photovoltaik‐Anlage könnte ein Einfamilienhaus in Deutschland mit elektrischem Strom, warmem Wasser und Raumwärme versorgen, wenn die Energie lastganggerecht über das Jahr verteilt würde. Der Stand der Technik bietet dafür noch keine Lösung. Am konkreten Beispiel wird abgeschätzt, welche Parameter ein Stromspeichersystem dafür haben müsste. Es wird ein geeignetes elektrochemisches Reaktionssystem auf Basis anorganischer Salzgemische vorgeschlagen. Dem gleichen Stoffsystem liegt ein „Weltspeicher“ zugrunde, der im Rahmen eines Pilotinnovationswettbewerbs vom Deutschen Bundesministerium für Bildung und Forschung gefördert wird.

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Experimental Set‐Up for Measurement of Half‐Cell‐ and Over‐Potentials of Flow Batteries During Operation

Gonzalez,

Peljo

2024

Batteries & Supercaps

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The study of flow batteries (FBs) requires the development of tools able to evaluate their performance during operation in a reliable and simple way. In this work, we present an experimental set‐up that allows the on‐line monitoring of the half‐cells state of charge and apparent overpotentials on the positive and negative electrodes during battery operation. These measurements are feasible by using additional flow cells that include a reference electrode on each side. We used the experimental set‐up to study the performance of the vanadium system as well as a previously reported stable organic couple. The studies consisted on short cycling operation at different current densities and polarization curves at different flow rates and states of charge. By confirming previous results obtained for vanadium‐FBs and extending the analysis to further systems, we demonstrated that this approach provides a reliable deeper insight into the battery performance and the processes taking place during operation.

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Monitoring the state of charge of all-vanadium redox flow batteries to identify crossover of electrolyte

Cited by 40 publications

References 32 publications

Half-Cell State of Charge Monitoring for Determination of Crossover in VRFB—Considerations and Results Concerning Crossover Direction and Amount

Half-Cell State of Charge Monitoring for Determination of Crossover in VRFB—Considerations and Results Concerning Crossover Direction and Amount

Konzept einer autarken elektrischen und thermischen Energieversorgung auf Basis von Photovoltaik

Experimental Set‐Up for Measurement of Half‐Cell‐ and Over‐Potentials of Flow Batteries During Operation

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