Engineering Multifunctional Binders for Micro‐Silicon Anodes: Mechanisms, Strategies, and Applications

Abstract Silicon‐based anode materials are widely regarded as promising candidates for next‐generation lithium‐ion batteries owing to their high theoretical specific capacity (3579 mAh g −1 ) and natural abundance. Among these, micro‐sized silicon (micro‐Si) offers superior commercial viability compared to nano‐Si due to its lower production costs and higher tap density. However, micro‐Si electrodes encounter critical challenges during cycling, such as severe stress concentration, lithium trapping, and unstable solid electrolyte interphase (SEI) formation. Binders, acting as structural and electrochemical regulators, play a pivotal role in addressing these limitations; however, systematic evaluations of functional binders tailored for micro‐Si remain scarce. This review compares the advantages and limitations of nano‐Si and micro‐Si, highlighting the industrial potential of micro‐Si and elucidating its distinct degradation mechanisms. State‐of‐the‐art binder design strategies for micro‐Si anodes and current advances in their practical applications are then reviewed. Finally, future perspectives are discussed, emphasizing the importance of binder innovation in enabling the commercial deployment of micro‐Si anodes.