Strategies for Redox Potential Regulation of Organic Molecules in Nonaqueous Redox Flow Batteries

Redox flow batteries (RFBs) are a promising solution for large‐scale and sustainable energy storage. However, aqueous RFBs (ARFBs) are limited by the narrow electrochemical window of water (1.23 V), making it difficult to achieve high voltage output. Nonaqueous organic RFBs (NAORFBs), leveraging the wide electrochemical stability window of nonaqueous solvents (3–5 V) and the structural tunability of redox‐active organic molecules (ROMs), possess the potential to construct high voltage and energy density RFBs. Nevertheless, issues including poor redox potential matching of ROMs and the imbalance between potential and stability seriously restrict the improvement of the actual operating voltage and energy density of the batteries. Therefore, the targeted regulation of redox potentials has become a critical breakthrough for the development of NAORFBs. This review focuses on the potential tuning mechanisms of organic molecules, with an emphasis on strategies for elevating the redox potential of cathode materials and lowering those of anode materials. We summarize recent advances in the structural modification of ROMs and analyze how these strategies influence the redox potential and stability. By centering on molecular design principles for redox potential control, this work offers mechanistic insights and future directions for the development of high‐voltage NAORFBs.