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Verification of Redox Flow Batteries Functionality by Electrochemical Impedance Spectroscopy Tests

Manschke, Daniel and Seipp, Thorsten and Berthold, Sascha and Friedrich, Kaspar Andreas (2018) Verification of Redox Flow Batteries Functionality by Electrochemical Impedance Spectroscopy Tests. Batteries, 4 (58), pp. 2-14. MDPI (Multidisciplinary Digital Publishing Institute). DOI: 10.3390/batteries4040058 ISSN 2313-0105

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Official URL: https://www.mdpi.com/journal/batteries

Abstract

The state-of-the-art functionality test of classic redox-flow-stacks measures the current–voltage characteristic with the technical electrolyte. This research paper aims to simplify the validation of redox flow batteries’ functionality by conducting electrochemical impedance spectroscopy (EIS) on redox flow stacks. Since the electrolyte used in the batteries is usually toxic and aggressive, it would be a significant simplification to verify the functionality with an alternative, non-toxic fluid. EIS measurements on batteries with larger sized electrodes, multiple cells, and different fluids were performed. It was demonstrated that all impedances are repeatable, thereby validating this procedure as a qualification method for full-size and complex batteries with an alternative fluid. EIS measurements were able to detect deliberately manipulated cells. This Research uses three different analysis methods for the acquired data to identify errors. The respective approaches are, firstly, (1) a comparison of the Nyquist plots; secondly, (2) a comparison of the Bode plots; and thirdly, (3) a comparison of the calculated characteristic values of the equivalent circuits. The analysis found that all methods are suitable to detect errors in the batteries. Nevertheless, the bode-plot comparison method proves to be especially advantageous, because it enables a quantitative statement.

Item URL in elib:https://elib.dlr.de/124480/
Document Type:Article
Title:Verification of Redox Flow Batteries Functionality by Electrochemical Impedance Spectroscopy Tests
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Manschke, DanielVolterion GmbHUNSPECIFIED
Seipp, ThorstenVolterion GmbHUNSPECIFIED
Berthold, SaschaVolterion GmbHUNSPECIFIED
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deUNSPECIFIED
Date:October 2018
Journal or Publication Title:Batteries
Refereed publication:No
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:No
In ISI Web of Science:No
Volume:4
DOI :10.3390/batteries4040058
Page Range:pp. 2-14
Publisher:MDPI (Multidisciplinary Digital Publishing Institute)
ISSN:2313-0105
Status:Published
Keywords:redox-flow batteries, Quality controls, impedance analysis
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:20 Dec 2018 14:06
Last Modified:20 Dec 2018 14:06

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