Utilizing Pore Network Modeling for Performance Analysis of Multi-Layer Electrodes in Vanadium Redox Flow Batteries

Vanadium redox flow batteries (VRFBs) are promising energy storage devices. The microstructure of the porous electrode affects performance VRFBs. Therefore, identifying optimized structures is an active research area. However, designing optimal microstructures requires studying varieties structural parameters and design cases using a modeling tool with low computational cost. In this study, pore network (PNM) framework was developed to study effects multi-layer electrodes on VRFB performance. contrast previous experimental works that were focused structure same material, explored effect different in each layer. Using image generation algorithm, fibrous materials generated from which networks extracted. PNM included modification by adding throat nodes geometry accommodate velocity dependent mass transfer coefficient. results showed putting highly permeable layer near membrane provides alternative preferential path for fluid distribute supply those regions reactive species, resulting 57% increase limiting current density opposite order. selection desired must be based trade-off between current/power pressure drop.