Flexible Fluorine/Nitrogen Co‐Doped Carbon Electrodes with Silver Nanowire Reinforcement Enable Ultralong‐Cycling Lithium‐Ion Batteries

Abstract The growing demand for flexible electronic devices necessitates power sources that combine high energy density with robust mechanical stability. While in situ growth techniques mitigate the detachment of active materials from flexible substrates, mechanical fatigue—such as cracking and delamination under repeated deformation—continues to limit electrode durability and cycle life. To address these challenges, the design of a self‐supporting, binder‐free flexible electrode (AgNWs/FN‐CNTs/CNF) (CNT = carbon nanotube; CNF = carbon nanofiber) is reported that integrates silver nanowires (AgNWs) as both internal fillers and external coatings. This dual‐surface reinforcement strategy enhances the electrode's structural integrity, enabling ultra stable cycling over 10 000 cycles at 5 A g −1 with a specific capacity of 112 mAh g −1 . Furthermore, fluorine and nitrogen co‐doping effectively enlarges the interlayer spacing of graphitic domains, facilitating lithium‐ion diffusion and improving rate capability. Flexible pouch cell tests demonstrate the mechanical resilience and stable electrochemical performance of the electrode under repeated deformation. This work presents a scalable and efficient approach for enhancing the mechanical and electrochemical stability of flexible electrodes, offering design principles for the development of next‐generation high‐performance flexible energy storage devices.