2D MXene-Based Electrolytes for All-Solid-State Batteries: Fundamentals and Advances

The search for next-generation energy storage devices to power our always-evolving technology is a never-ending endeavor. In energy storage devices, electrolytes are one of the most important factors that influence cycling performance and safety. Conventional electrolytes are at high risk of fire hazards due to factors like operating potential windows and operating temperature, and additives such as metal oxides, polymers, and conductive salts have been studied extensively. Recently, a two-dimensional (2D) family of metal carbides called MXenes (M n+1X n T x ) has come into focus for application in different research areas. It has been extensively studied over the last decade because of its high mechanical stability, conductivity, thermal stability, and compatibility with other materials. Therefore, MXenes have been used as an electrolyte additive in energy storage devices, especially in polymer-based solid-state electrolytes. In this chapter, a detailed explanation of MXenes, their stability and compatibility with electrolytes—and application in different energy storage systems—will be discussed.