Aqueous all soluble Fe redox flow batteries for large scale energy storage applications

Iron, as one of the Earth's most prevalent elements, presents numerous advantages over scarce and costly materials such as cobalt and nickel. The natural abundance of iron results in lower raw material expenses, making Fe-based battery chemistries more economically feasible, particularly for large-scale uses like grid energy storage. The abundance of iron is a key factor in advancing battery technologies that necessitate affordable and scalable energy storage solutions. Beyond the economic advantages, iron's electrochemical properties facilitate stable redox reactions, which are essential for energy storage systems. Additionally, iron's low toxicity and widespread geographic availability mitigate supply chain risks, bolstering long-term sustainability. These characteristics render Fe-based batteries highly suitable for stationary energy storage and other extensive applications where cost, safety, and durability are critical. This presentation will explore the growing interest in all-soluble Fe-RFB technologies. Unlike conventional hybrid Fe-RFB systems that utilize a hybrid anode, all-soluble Fe-RFB employs soluble electrolytes for both the anode and cathode sides, similar to vanadium RFB systems. This approach allows for the decoupling of energy and power—addressing a key technical challenge faced by conventional hybrid Fe flow batteries—thus overcoming technical limitations and enhancing operational scalability.