Beyer, Kirstin and grosse Austing, Jan and Satola, Barbara and Di Nardo, Timo and Zobel, Marco and Agert, Carsten (2020) Electrolyte Imbalance Determination of a Vanadium Redox Flow Battery by Potential‐Step Analysis of the Initial Charging. ChemSusChem, 13 (8), pp. 2066-2071. Wiley. doi: 10.1002/cssc.201903485. ISSN 1864-5631.
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Official URL: http://dx.doi.org/10.1002/cssc.201903485
Abstract
Vanadium redox flow batteries (VRFB) suffer from capacity fades owing to side reactions and crossover effects through the membrane. These processes lead to a deviation of the optimal initial average oxidation state (AOS=+3.5) of vanadium species in both half‐cell electrolytes. To rebalance the electrolyte solutions, it is first necessary to determine the current AOS. In this study, a new method was developed that enables an accurate determination of the AOS. A potential‐step analysis was performed with mixed electrolyte solutions of both half‐cells during the initial charging. The potential was recorded with a simple open‐circuit voltage (OCV) cell, and the potential‐steps were analyzed. A correlation between the duration of the potential plateaus in the OCV and the amount of vanadium ions of a certain oxidation state in the half‐cell electrolytes was found and used to precisely determine the AOS with a maximum error of 3.6 %.
Item URL in elib: | https://elib.dlr.de/135676/ | |||||||||||||||||||||
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Document Type: | Article | |||||||||||||||||||||
Title: | Electrolyte Imbalance Determination of a Vanadium Redox Flow Battery by Potential‐Step Analysis of the Initial Charging | |||||||||||||||||||||
Authors: |
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Date: | 22 January 2020 | |||||||||||||||||||||
Journal or Publication Title: | ChemSusChem | |||||||||||||||||||||
Refereed publication: | Yes | |||||||||||||||||||||
Open Access: | Yes | |||||||||||||||||||||
Gold Open Access: | No | |||||||||||||||||||||
In SCOPUS: | Yes | |||||||||||||||||||||
In ISI Web of Science: | Yes | |||||||||||||||||||||
Volume: | 13 | |||||||||||||||||||||
DOI: | 10.1002/cssc.201903485 | |||||||||||||||||||||
Page Range: | pp. 2066-2071 | |||||||||||||||||||||
Publisher: | Wiley | |||||||||||||||||||||
ISSN: | 1864-5631 | |||||||||||||||||||||
Status: | Published | |||||||||||||||||||||
Keywords: | batteries, capacity decay, imbalance detection, redox chemistry, vanadium | |||||||||||||||||||||
HGF - Research field: | Energy | |||||||||||||||||||||
HGF - Program: | Technology, Innovation and Society | |||||||||||||||||||||
HGF - Program Themes: | Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales | |||||||||||||||||||||
DLR - Research area: | Energy | |||||||||||||||||||||
DLR - Program: | E SY - Energy Systems Analysis | |||||||||||||||||||||
DLR - Research theme (Project): | E - Energy Systems Technology (old) | |||||||||||||||||||||
Location: | Oldenburg | |||||||||||||||||||||
Institutes and Institutions: | Institute of Networked Energy Systems > Urban and Residential Technologies | |||||||||||||||||||||
Deposited By: | Beyer, Kirstin | |||||||||||||||||||||
Deposited On: | 04 Aug 2020 15:29 | |||||||||||||||||||||
Last Modified: | 04 Aug 2020 15:29 |
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