The integration of renewable energy necessitates advanced storage solutions, with redox flow batteries (RFBs) exhibiting significant potential. However, conventional RFBs with enlarged electrode areas suffer from nonuniform electrolyte distribution, increasing internal resistance, and degrading performance. In this study, we address this limitation through a redesigned RFB structure incorporating graphite flow field plates and carbon felt electrodes. Finite element method simulations were performed to evaluate critical parameters: electrode area (10 cm²), polygonal geometry (hexagonal), and slope channel angle (7°). Results showed that this configuration—employing chemically resistant graphite for structural components and high-surface-area carbon felt for electrodes—optimizes the flow field distribution uniformity. The 7°-sloped hexagonal channels significantly reduce flow maldistribution compared with traditional designs. This geometric and material optimization directly enhances electrochemical performance by mitigating resistance issues, providing a viable approach for scaling RFB systems.