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The effect of felt compression on the performance and pressure drop of all-vanadium redox flow batteries

Brown, LD; Neville, TP; Jervis, R; Mason, TJ; Shearing, PR; Brett, DJL; (2016) The effect of felt compression on the performance and pressure drop of all-vanadium redox flow batteries. Journal of Energy Storage , 8 pp. 91-98. 10.1016/j.est.2016.10.003. Green open access

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Brett_R1_The%20effect%20of%20felt%20compression%20on%20the%20performance%20and%20pressure%20drop%20of%20all-vanadium%20redox%20flow%20batteries%20RJ_LDB.pdf - Accepted version

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Abstract

The compression of carbon felt electrodes for redox flow batteries leads to changes in the electrochemical performance and has a large effect on the pressure drop of electrolyte flow through the system. In this investigation, the authors have characterised the electrochemical performance of all-vanadium redox flow batteries by studying the effect of compression on the contact resistance, polarisation behaviour and efficiency. Contact resistance was seen to reduce from ca. 2.0 Ω cm2 to 1.2 Ω cm2 and an energy efficiency of 85% was obtained from a felt compressed to 75%. Moreover, X-ray computed tomography (CT) has been employed to study the microstructure of felt electrodes at compressions up to 70%, showing a linear decrease in porosity and a constant fibre surface area-to-volume ratio. The pressure drop was modelled using computational fluid dynamics and employing the 3D structure of the felts obtained from CT, revealing that a 60% increase in compression related to a 44.5% increase in pressure drop.

Type: Article
Title: The effect of felt compression on the performance and pressure drop of all-vanadium redox flow batteries
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.est.2016.10.003
Publisher version: http://dx.doi.org/10.1016/j.est.2016.10.003
Language: English
Additional information: © 2017. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Energy storage; X-ray computed tomography; Flow; Contact resistance; Compression
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1545053
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