Increasing energy density of vanadium redox flow batteries: A comprehensive review
DOI:
https://doi.org/10.61511/eam.v3i2.2025.1828Keywords:
vanadium redox flow battery (VRFB), energy density, electrolyte optimization, electrode modification, membrane engineeringAbstract
Background: Vanadium Redox Flow Batteries (VRFBs) represent a leading energy storage technology for renewable integration due to their long cycle life, high safety, and flexible scalability. However, their low energy density and high cost continue to limit widespread adoption. This study aims to synthesize and critically evaluate recent advances in enhancing VRFB performance through innovations in electrode materials, electrolyte chemistry, and membrane design. Methods: This study adopts a comprehensive literature review approach, analyzing theoretical and experimental research published in recent years. The review focuses on advancements in nanostructured electrode surfaces, optimized electrolyte formulations, and functional hybrid membranes. Theoretical insights from materials science and electrochemistry were integrated to establish the correlation between structure, performance, and efficiency. Findings: The reviewed studies reveal that nanostructured and heteroatom-doped electrodes enhance redox kinetics and minimize side reactions, while optimized electrolytes with mixed acids and stabilizers improve vanadium solubility and thermal stability. Hybrid polymer–inorganic membranes effectively reduce vanadium ion crossover and maintain high proton conductivity, thereby increasing coulombic and energy efficiencies. Collectively, these advancements improve power output, reduce self-discharge, and enhance long-term cycling performance, moving VRFBs closer to economic feasibility. Conclusion: Advancements in material design and system optimization are pivotal in overcoming the limitations of conventional VRFBs. Continued research on scalable, low-cost materials, electrolyte recycling, and hybrid integration will further promote sustainable energy storage. Novelty/Originality of this article: This review uniquely integrates material-level and system-level perspectives, offering a holistic understanding of how innovations across components collectively advance high-efficiency, cost-effective, and environmentally sustainable VRFB technology for next-generation renewable energy systems.
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