Fiber‐Shaped Zinc‐Based Batteries: Mechanisms, Process, and Wearable Applications

The development of novel flexible batteries with high performance and enhanced safety is a critical step toward advancing wearable technology and enabling its large‐scale application. Fiber‐shaped batteries have gained significant attention due to their unique advantages, such as miniaturization and weavability, making them well suited for wearable applications. Fiber zinc‐based batteries have emerged as a promising candidate, benefiting from zinc's natural abundance, low redox potential, high theoretical capacity, cost‐effectiveness, and intrinsic safety. Despite significant progress, including the development of integrated device systems and self‐powered energy textiles, fiber zinc‐based batteries still encounter several challenges. Reversibility issues, such as dendrite formation and electrolyte instability, remain critical concerns, particularly frequent mechanical deformations and diverse application environments. Additionally, the complex fabrication process hinders large‐scale commercialization by increasing production costs, reducing consistency, and limiting scalability. This review first presents the working principles of fiber zinc‐based batteries, followed by an analysis of their design strategies and research progress. It then discusses the integration of fiber zinc‐based batteries with other electronic devices and points out key challenges and prospects, aiming to inspire more research for their widespread practical use.