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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.
Soluble lead, Redox flow battery, Modelling and Simulation, Divided, Membrane
2352-4847
49-55
Fraser, Ewan Joseph
0c5d3bc0-a4e7-4213-ab3b-e750103469d7
Kahanda Koralage, Janaka Ranga Dinesh
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Wills, Richard
60b7c98f-eced-4b11-aad9-fd2484e26c2c
Fraser, Ewan Joseph
0c5d3bc0-a4e7-4213-ab3b-e750103469d7
Kahanda Koralage, Janaka Ranga Dinesh
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Wills, Richard
60b7c98f-eced-4b11-aad9-fd2484e26c2c

Fraser, Ewan Joseph, Kahanda Koralage, Janaka Ranga Dinesh 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: Special issue

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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Accepted/In Press date: 17 February 2021
e-pub ahead of print date: 28 May 2021
Keywords: Soluble lead, Redox flow battery, Modelling and Simulation, Divided, Membrane

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 Joseph Fraser: ORCID iD orcid.org/0000-0001-9592-9071
ORCID for Janaka Ranga Dinesh Kahanda Koralage: 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: 16 Sep 2021 01:51

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Contributors

Author: Ewan Joseph Fraser ORCID iD
Author: Richard Wills ORCID iD

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