Research progress on flexible MXene‐based materials in advanced energy storage devices: From preparation strategies to device applications

Abstract The rapid development of wearable and portable electronics has created demand for flexible energy storage systems (FESDs) that not only exhibit superior electrochemical performance but also exhibit good mechanical durability. The unique properties of two‐dimensional MXene materials, such as their high electrical conductivity, adjustable surface chemistries, and inherent mechanical flexibility, make them suitable for use as electrode materials in flexible FESDs. This review summarizes the latest advancements in MXene‐based flexible materials for energy storage applications. Unlike previous studies, this work methodically traces the entire research pathway—from the synthesis of materials and the design of structures (such as films, fibers, and three‐dimensional architectures) to the assembly of functional flexible devices. The relationship between MXene material structure and device performance during degrees of mechanical deformation (such as bending or stretching) is specifically highlighted. Furthermore, the review addresses existing challenges that restrict large‐scale applications of flexible MXene FESDs, such as interlayer stacking issues, oxidation stability, and scalable fabrication procedures. Lastly, future research directions and outlooks for MXene‐based FESDs are provided.