From Materials to Devices: All‐MXene Platforms for Advanced Energy Storage

ABSTRACT The advancement of next‐generation energy storage devices relies on the availability of multifunctional materials that can serve as both active and passive components and can be seamlessly integrated into flexible and wearable electronics. MXenes, a unique family of two dimensional (2D) transition‐metal carbides, nitrides and/or carbonitrides, feature a unique combination of metallic conductivity, tunable surface chemistry, redox activity, high mechanical strength and structural flexibility. This combination of properties enables MXenes to be used in both active and passive components of storage devices, including active electrode anode and cathode materials and electrolytes, as well as passive separators and current collectors. This perspective highlights the promising potential of all‐MXene architectures, where MXenes serve as all the essential functional components of storage devices. We briefly discuss their synthesis and highlight how structural, surface and interlayer modification can be performed to tailor the MXene performance for energy storage applications. Following an overview of their potential as anodes or cathodes, we discuss their use in solid‐state and gel‐state electrolytes, dendrite‐suppressing separators and lightweight, conductive current collectors and binders. We also highlight challenges such as oxidation stability, restacking and scalability of MXenes, and propose key future directions that need to be addressed to practically realize all‐MXenes devices.