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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 iDORCID Put Code
Beyer, KirstinUNSPECIFIEDhttps://orcid.org/0000-0002-3733-5790UNSPECIFIED
grosse Austing, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Satola, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-5807-1763UNSPECIFIED
Di Nardo, TimoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zobel, MarcoUNSPECIFIEDhttps://orcid.org/0000-0002-8993-0727UNSPECIFIED
Agert, CarstenUNSPECIFIEDhttps://orcid.org/0000-0003-4733-5257UNSPECIFIED
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:23 Oct 2023 12:16

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