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A two dimensional numerical model of the membrane-divided soluble lead flow battery

A two dimensional numerical model of the membrane-divided soluble lead flow battery
A two dimensional numerical model of the membrane-divided soluble lead flow battery
Dividing the soluble lead flow battery (SLFB) is known to improve the cycle life of the SLFB by preventing failure mechanisms such as short-circuiting and by allowing electrode specific electrolyte additives. Modelling (SLFB) is a complex multiphysics problem due to the electrolyte flow, composition changes and reaction environment geometry variations associated with the deposition and dissolution of the active material as a function of state of charge. Here we studied the membrane divided SLFB using a two-dimensional, transient, numerical model, built in COMSOL Multiphysics. Divided cells using cationic and anionic ion-exchange membranes and simple, porous separators are compared with the undivided SLFB. The model successfully predicts the complex, non-linear relationship between Pb2+ ion concentration and conductivity of the electrolyte as a function of free acid concentration. There is a deviation of less than 22 mS cm-1 between the simulated electrolyte conductivity and the experimental data. We show the conductivity of the Nafion-115 membrane in the SLFB dominated the potential drop across the membrane. However, at higher current densities, the Donnan potential becomes more dominant.
Divided, Membrane, Modelling and Simulation, Redox flow battery, Soluble lead
2352-4847
49-55
Fraser, Ewan
5ec334a1-8ab3-4028-8d67-57a19024ad00
Ranga Dinesh, K.K.J
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Wills, Richard
60b7c98f-eced-4b11-aad9-fd2484e26c2c
Fraser, Ewan
5ec334a1-8ab3-4028-8d67-57a19024ad00
Ranga Dinesh, K.K.J
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Wills, Richard
60b7c98f-eced-4b11-aad9-fd2484e26c2c

Fraser, Ewan, Ranga Dinesh, K.K.J and Wills, Richard (2021) A two dimensional numerical model of the membrane-divided soluble lead flow battery. Energy Reports, 7 (2), 49-55. (doi:10.1016/j.egyr.2021.02.056).

Record type: Article

Abstract

Dividing the soluble lead flow battery (SLFB) is known to improve the cycle life of the SLFB by preventing failure mechanisms such as short-circuiting and by allowing electrode specific electrolyte additives. Modelling (SLFB) is a complex multiphysics problem due to the electrolyte flow, composition changes and reaction environment geometry variations associated with the deposition and dissolution of the active material as a function of state of charge. Here we studied the membrane divided SLFB using a two-dimensional, transient, numerical model, built in COMSOL Multiphysics. Divided cells using cationic and anionic ion-exchange membranes and simple, porous separators are compared with the undivided SLFB. The model successfully predicts the complex, non-linear relationship between Pb2+ ion concentration and conductivity of the electrolyte as a function of free acid concentration. There is a deviation of less than 22 mS cm-1 between the simulated electrolyte conductivity and the experimental data. We show the conductivity of the Nafion-115 membrane in the SLFB dominated the potential drop across the membrane. However, at higher current densities, the Donnan potential becomes more dominant.

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Energy Reports 5th Annual CDT ESA Fraser Plain - Accepted Manuscript
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Energy_Reports_5th_Annual_CDT_ESA_Fraser_Plain - Accepted Manuscript
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More information

Accepted/In Press date: 17 February 2021
e-pub ahead of print date: 28 May 2021
Published date: 28 May 2021
Additional Information: Funding Information: The authors acknowledge the use of the IRIDIS High Performance Computing Facility in the completion of this work. The authors also thank the Engineering and Physical Sciences Research Council (EPSRC), United Kingdom for their financial support through the Centre for Doctoral Training in Energy Storage and its Applications grant EP/L016818/1 . Publisher Copyright: © 2021 Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Keywords: Divided, Membrane, Modelling and Simulation, Redox flow battery, Soluble lead

Identifiers

Local EPrints ID: 448801
URI: http://eprints.soton.ac.uk/id/eprint/448801
ISSN: 2352-4847
PURE UUID: 4ddceb51-b083-4e59-a5c0-dde08973b462
ORCID for Ewan Fraser: ORCID iD orcid.org/0000-0001-9592-9071
ORCID for K.K.J Ranga Dinesh: ORCID iD orcid.org/0000-0001-9176-6834
ORCID for Richard Wills: ORCID iD orcid.org/0000-0002-4805-7589

Catalogue record

Date deposited: 06 May 2021 16:30
Last modified: 12 Jun 2024 04:06

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