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Modelling and accelerated testing of catholyte stability in vanadium flow batteries

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Show simple item record Buckley, Noel Oboroceanu, Daniela Quill, Nathan Lenihan, Catherine Lynch, Robert P. 2021-06-04T14:21:02Z 2021-06-04T14:21:02Z 2021
dc.description peer-reviewed en_US
dc.description.abstract Using our standard methodology, we examined the thermal stability of vanadium flow battery positive electrolytes over a range of temperature from 30 to 70 °C with stable lifetimes from 11 min to 87 days. At higher temperatures (45 °C–70 °C) measurements showed excellent reproducibility but at lower temperatures (30 °C–45 °C) showed some scatter. Measurements at higher temperatures are in good agreement with our (single-slope) model which is based on earlier data but there is some divergence from the model at lower temperatures. Arrhenius plots of the data show two linear regimes: one in the range 45 °C–70 °C and another in the range 30 °C–45 °C, the latter having a higher Arrhenius slope. Based on linear least-squares best fits in these two regimes, we have formulated an improved stability model (two-slope model). We use our models to derive expressions for accelerated testing of thermal stability using increased temperature, increased vanadium concentration and decreased sulfate concentration and estimate values for the acceleration factors over a range of test and use temperatures and concentrations. We analyse the effect of changing concentration to counteract the decrease in electrolyte stability at higher temperatures and derive expressions to calculate the necessary concentrations. en_US
dc.language.iso eng en_US
dc.publisher Electrochemical Society en_US
dc.relation.ispartofseries Journal of The Electrochemical Society;168, 030530
dc.subject vanadium flow batteries en_US
dc.subject high energy en_US
dc.title Modelling and accelerated testing of catholyte stability in vanadium flow batteries en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1149/1945-7111/abec52
dc.contributor.sponsor EI en_US
dc.contributor.sponsor ERDF en_US
dc.contributor.sponsor European Union (EU) en_US
dc.relation.projectid CF 2013 3303 en_US
dc.relation.projectid CF 2018 1008 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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