Piezoelectric Field‐Derived Mechano–Electrochemical Regulation for Durable SiO Anode

Abstract

Silicon monoxide (SiO) has emerged as a promising high‐capacity anode material for next‐generation lithium‐ion batteries. Nevertheless, the practical application of SiO anodes remains hindered by sluggish Li+ ion transport kinetics and persistent mechanical stress heterogeneity during deep lithiation. Here, we propose a piezoelectric functional–modification strategy that transforms the intrinsic expansion stress of SiO into a self‐adaptive driving force for electrochemical regulation. By decorating SiO with piezoelectric LiTaO3 (SiO–P), the periodic volume fluctuation during cycling activates localized electric fields that accelerate Li+ ion migration, homogenize interfacial charge distribution, and promote the formation of a uniform, robust SEI. The resulting SiO–P composite delivers exceptional cycling stability, maintaining 380.8 mAh g−1 after 500 cycles at 2 C, with significantly enhanced durability validated in pouch–cell configurations. This work establishes a mechano–electrochemical paradigm that converts detrimental mechanical stress into a beneficial regulatory signal, offering a promising route toward high‐energy, durable SiO‐based anodes for practical LIBs.