Journal Article

FZJ-2025-02786

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Introducing an Experimental Route to Identify and Unify Lab‐Scale Redox‐Flow Battery Cell Performances via Molar Fluxes and Cell Constants

Fricke, S.FZJ* ; Kortekaas, L. ; Winter, M.FZJ* ; Grünebaum, M. (Corresponding author)FZJ*

2025
WILEY-VCH Verlag GmbH & Co. KGaA Weinheim

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Please use a persistent id in citations: doi:10.1002/smtd.202401670  doi:10.34734/FZJ-2025-02786

Abstract: Redox flow batteries (RFBs) are a promising technology for grid energy storage based on their high potential for scalability, design flexibility, high efficiency, and long durability, hence great effort has been invested in this area of research. However, due to the large differences in lab-scale RFB cell design and construction as well their operational performance, fundamental studies on innovative RFB components (e.g., active materials, separators, additives) compare poorly due to the lack of standard setups, settings, and procedures. This work introduces an experimental calibration route for aqueous as well as nonaqueous RFBs based on a simple mass transport model using molar fluxes, enabling one to compare dissimilar lab-scale RFB cell setups by introducing several RFB parameters: First, K1, which summarizes the operating parameters of an RFB to identify the critical ratio (K1critical) needed for efficient charge–discharge cycling using a simple overvoltage and charge efficiency evaluation; second, the RFB cell constant ζ, quantifying the influence of a lab-scale RFB setup on its performance; and finally, K2, ultimately enabling full comparison of (idealized) K1critical operating parameters across RFB cell setups.

Note: This research was funded by the German Federal Ministry of Education and Research and by the Ministry of Arts and Science of the state of North Rhine-Westphalia in the framework of the core funding for Jülich Research Centre.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IMD-4)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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