Multiscale Interfacial Regulation for Stable Zinc Anodes: From Fundamental Mechanisms to Practical Applications

ABSTRACT Aqueous zinc‐ion batteries (AZIBs) are promising candidates for large‐scale energy storage due to their intrinsic safety and low cost. However, their commercialization is hampered by notorious zinc anode issues, including uncontrolled dendrite growth and parasitic side reactions. Multiscale interfacial regulation has recently emerged as a transformative strategy to address these challenges. This approach overcomes the limitations of single‐interface modulation by constructing multilayer structures and optimizing interface coupling, thereby providing effective anode protection. To promote uniform zinc plating and suppress side reactions, this review comprehensively summarizes multiscale strategies that span the optimization of multi‐physical fields, zinc deposition orientation, and electrolyte solvation structures. We systematically present recent advances in applying these multiscale strategies to zinc foil, zinc powder, and host‐based anodes, as well as separators and hydrogel electrolytes, with a focus on their design principles, underlying mechanisms, and scenario‐specific applicability. Furthermore, we elucidate how this technology achieves synergistic optimization of ion transport, deposition behavior, and the interfacial environment through functionally complementary multilayer, Janus, or gradient interfaces, thereby systematically mitigating zinc anode failure. Finally, future research directions and challenges are discussed, emphasizing that a profound mechanistic understanding coupled with rational design is pivotal for unlocking the full potential of next‐generation AZIBs.