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Electrolyte Imbalance Determination of a Vanadium Redox Flow Battery by Potential‐Step Analysis of the Initial Charging

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/
Document Type:Article
Title:Electrolyte Imbalance Determination of a Vanadium Redox Flow Battery by Potential‐Step Analysis of the Initial Charging
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Beyer, KirstinKirstin.Beyer (at) dlr.dehttps://orcid.org/0000-0002-3733-5790
grosse Austing, JanUNSPECIFIEDUNSPECIFIED
Satola, Barbarabarbara.satola (at) dlr.dehttps://orcid.org/0000-0002-5807-1763
Di Nardo, TimoUNSPECIFIEDUNSPECIFIED
Zobel, Marcomarco.zobel (at) dlr.deUNSPECIFIED
Agert, CarstenCarsten.Agert (at) dlr.dehttps://orcid.org/0000-0003-4733-5257
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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