Morphological Properties and Electrochemical Performance for Compressed Carbon-fiber Electrodes in Redox Flow Batteries

• DOI: 10.1149/1945-7111/ad36e5
• Publication Date: 2024-03-22T22:23:50Z
• Authors: Baichen Liu; Søren Bredmose Si...; Johan Hjelm
• Keywords: Carbon fibers

Improving reactor performance of redox flow batteries is critical to reduce capital cost, and one the main contributions internal resistance generated by electrodes, which also impact pressure drop stack. Porous electrodes with optimized microstructure physiochemical properties play a key role in enhancing electrochemical fluid dynamic performance. Electrode compression significantly impacts morphology battery behavior, but relationship between remains unclear. In present study, three representative, commercially available, carbon-fiber (i.e., paper, felt, cloth) distinct microstructures were investigated, comprehensive study was conducted compare morphology, hydraulic permeability, mechanical lab-scale vanadium at ratios 0%–50%. The 3D electrode characterized through X-ray computed tomography extracted parameters (e.g., surface area tortuosity) compared corresponding electrochemically determined parameters. optimal trade-off dynamics occurred 30%, 20%, 20% for cloth, respectively. Owing bi-modal porosity woven microstructure, cloth showed better than other electrodes.