Polymers forFiber Batteries

Fiber batteries have garnered significant attention due to their advantages, such as miniaturization, weavability, permeability, and integrability, making them ideal for wearable electronics. Polymer materials, by virtue of their high designability, light weight, low cost, high stability, and mechanical flexibility, have been widely introduced to achieve not only high flexibility and wearable compatibility, but also superior electrochemical performance and safety of fiber batteries. In this Perspective, we systematically discuss the applications of polymer materials in electrodes, electrolytes, separators, and packaging tubes for fiber batteries with an emphasis on material design and device performance. Finally, we summarize the remaining challenges and future directions for polymer-based fiber batteries.