Impact of electrolyte composition on the mitigation of electrolyte imbalance in a vanadium redox flow battery: A 3D multiphysics model
Fernando Zorrilla, Manuel Montiel, Radu Mustata, Raul Losantos, Luis Valiño.
Journal of Energy Storage 107 (2025) 114899
In this work an all-vanadium redox flow battery 3D model is developed to study the crossover phenomena causing electrolyte imbalance in an perpendicularly assembled battery. Fluid flow is fully modeled including transition from porous media to non-porous zones coupling the Navier–Stokes equations with the Brinkman corrections. General conservation laws are applied to model the electrochemistry in the electrolyte and electrochemical equilibrium is used to model Donnan effect at the membrane-electrolyte interface. Exclusion of the co-ions in the membrane is carefully modeled leading to a novel treatment of the sulfuric acid dissociated species in this domain. The impact of different proton and vanadium concentrations in the battery half-cells is studied in detail showing a potential way to reduce electrolyte imbalance.
In this work an all-vanadium redox flow battery 3D model is developed to study the crossover phenomena causing electrolyte imbalance in an perpendicularly assembled battery. Fluid flow is fully modeled including transition from porous media to non-porous zones coupling the Navier–Stokes equations with the Brinkman corrections. General conservation laws are applied to model the electrochemistry in the electrolyte and electrochemical equilibrium is used to model Donnan effect at the membrane-electrolyte interface. Exclusion of the co-ions in the membrane is carefully modeled leading to a novel treatment of the sulfuric acid dissociated species in this domain. The impact of different proton and vanadium concentrations in the battery half-cells is studied in detail showing a potential way to reduce electrolyte imbalance.