2D MXenes for all-solid-state batteries: A comprehensive review

Rechargeable all-solid-state batteries (ASSBs) comprising solid electrodes and electrolytes have attracted significant interest as next-generation battery systems because of their high energy density and enhanced safety, as compared to conventional lithium-ion battery (LIBs). However, numerous challenges, such as poor ionic conductivity of the solid electrolyte (SE), dendrite formation, unstable solid-solid interface between the electrolyte and electrodes, and limited cycle life, impede the industrial commercialization of ASSBs. 2D MXenes have recently emerged as advanced electrode and electrolyte materials capable of addressing the technical challenges faced by ASSBs owing to their unique properties such as outstanding metallic conductivity, abundant surface terminations, and metal-ion-philic surface properties. This review summarizes the latest advancements in MXene-based ASSB research for lithium, sodium, and zinc batteries. Furthermore, the technical challenges of MXene-based ASSBs are discussed and future perspectives and potential directions for the development of MXene-based ASSBs for next-generation energy storage systems are proposed.