Advanced Textile‐Based Lithium‐Metal Batteries: Interfacial Engineering, Structural Design, and Wearable Applications

Textile‐based lithium‐metal batteries (TLMBs), pivotal for next‐generation wearable energy storage, offer unparalleled advantages including ultrahigh theoretical capacity (3860 mAh g⁻¹), low electrochemical potential (−3.04 V vs standard hydrogen electrode), and seamless integration with flexible electronics. However, critical challenges such as dendritic lithium growth, unstable solid‐electrolyte interphase (SEI) evolution, and mechanical degradation under dynamic deformation hinder their practical deployment. This review presents a transformative paradigm centered on hierarchical structural engineering—encompassing atomic‐to‐macroscale interfacial design and textile‐architecture optimization—to address these barriers. The roles of gradient‐pore distributions, Janus‐structured fibers, and kirigami‐inspired geometries are systematically dissected in homogenizing Li‐ion flux, stabilizing SEI layers, and decoupling mechanical stress from electrochemical pathways, enabling TLMBs to sustain >500% strain without capacity loss. Furthermore, system‐level integration strategies for self‐powered health‐monitoring textiles and thermally adaptive batteries are scrutinized, bridging fundamental insights with scalable manufacturing. By identifying underexplored frontiers such as dynamic SEI regulators and circular economy‐aligned designs, this work provides a strategic roadmap to advance TLMBs toward high‐energy, mechanically robust wearable systems. The analysis aims to inspire interdisciplinary innovation, accelerating the transition from lab‐scale breakthroughs to real‐world applications in flexible energy storage.