An Open Circuit Voltage and Overpotential Model for an All Vanadium Redox Flow Battery Derived from Several Years of Operating Data

DOI

10.2991/ahe.k.220301.012How to use a DOI?

Keywords

all Vanadium redox flow; electrochemical storage; simulation; voltage model; open circuit voltage; overpotential

Abstract

One essential part in the simulation of electrochemical storage systems like redox flow batteries is the voltage on cell level. In this study, a model is derived for the open circuit voltage and the overpotentials of an all Vanadium system, based on the operation data of three commercial batteries over an extended period. The high amount of observations, especially the combination of a wide range of electrolyte temperatures and currents at different states of charge, allows for the correct identification and modelling of the relations between voltage and the measured variables. Different variants of Nernst equations are evaluated and it is found that considering temperature dependent standard electrode potentials and the inclusion of proton concentration in the catholyte are vital. Three types of overpotentials are modelled and respective parameters defining mass and charge transport are derived from the experimental data.

Copyright

© 2022 The Authors. Published by Atlantis Press International B.V.

Open Access

This is an open access article under the CC BY-NC license.

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TY  - CONF
AU  - Christoph Stegner
PY  - 2022
DA  - 2022/03/03
TI  - An Open Circuit Voltage and Overpotential Model for an All Vanadium Redox Flow Battery Derived from Several Years of Operating Data
BT  - Proceedings of the International Renewable Energy Storage Conference 2021 (IRES 2021)
PB  - Atlantis Press
SP  - 118
EP  - 125
SN  - 2589-4943
UR  - https://doi.org/10.2991/ahe.k.220301.012
DO  - 10.2991/ahe.k.220301.012
ID  - Stegner2022
ER  -