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Batteries 2019, 5(1), 2; https://doi.org/10.3390/batteries5010002

Investigation of Reactant Conversion in the Vanadium Redox Flow Battery Using Spatially Resolved State of Charge Mapping

1
Energy Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
2
Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
3
Vflowtech Pte Ltd., 32 Carpenter Street, Singapore 059911, Singapore
4
SGL Carbon GmbH, 86405 Meitingen, Germany
5
TUM Create, Singapore 138602, Singapore
6
School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
7
School of Material Science and Engineering, Nanyang Technological University, Singapore 637141, Singapore
Current address: 5607 Hägglingen, Switzerland.
*
Authors to whom correspondence should be addressed.
Received: 8 November 2018 / Revised: 10 December 2018 / Accepted: 13 December 2018 / Published: 1 January 2019
(This article belongs to the Special Issue Redox Flow Batteries for Large-Scale Energy Storage)
Full-Text   |   PDF [42610 KB, uploaded 1 January 2019]   |  

Abstract

Segmented cells enable real time visualization of the flow distribution in vanadium redox flow batteries by local current or voltage mapping. The lateral flow of current within thick porous electrodes, however, impairs the local resolution of the detected signals. In this study, the open circuit voltage immediately after the cessation of charge/discharge is used for the mapping of reactant conversion. This quantity is not hampered by lateral flow of current and can be conveniently transformed to the corresponding state of charge. The difference between theoretically calculated and experimentally determined conversion (change in the state of charge) across the electrode is used to determine local variations in conversion efficiency. The method is validated by systematic experiments using electrodes with different modifications, varying current densities and flow configurations. The procedure and the interpretation are simple and scalable to any size of flow cell. View Full-Text
Keywords: redox flow batteries; current distribution; voltage distribution; open circuit voltage; segmented cell redox flow batteries; current distribution; voltage distribution; open circuit voltage; segmented cell
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ghimire, P.C.; Bhattarai, A.; Schweiss, R.; Scherer, G.G.; Wai, N.; Lim, T.M.; Yan, Q. Investigation of Reactant Conversion in the Vanadium Redox Flow Battery Using Spatially Resolved State of Charge Mapping. Batteries 2019, 5, 2.

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