(Invited) State of Charge Monitoring of Vanadium Flow Batteries Using Spectroscopic and Electrochemical Methods

In this paper we demonstrate our ability to make accurate in- situ measurements of both the state-of-charge and the concentration of individual vanadium species in a lab scale vanadium flow battery. The analysis is based on our previously published characterization of the spectroscopy of mixed solut...

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Bibliographic Details
Published in:ECS transactions 2022-09, Vol.109 (3), p.131-148
Main Authors: Rybalchenko, Maria, Quill, Nathan, Buckley, D. Noel, Lynch, Robert P.
Format: Article
Language:English
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Summary:In this paper we demonstrate our ability to make accurate in- situ measurements of both the state-of-charge and the concentration of individual vanadium species in a lab scale vanadium flow battery. The analysis is based on our previously published characterization of the spectroscopy of mixed solutions of V II /V III and V IV /V V . Measurements of volume changes of the electrolyte in each half-cell are also shown and used to estimate the true value of concentration for each vanadium species as the cell is charged. The feasibility of optically monitoring the state-of-charge is clearly demonstrated and the unique ability of our data processing techniques to determine actual concentrations in- situ is revealed.
ISSN:1938-5862
1938-6737
DOI:10.1149/10903.0131ecst