The State-of-the-Art Two-Dimensional Heterostructure Engineering on MXenes and Metal Chalcogenides for Boosting Lithium-Ion Storage Properties.

Two-dimensional (2D) heterostructure materials combine the synergistic advantages of their 2D components, such as enhanced specific surface area, increased active sites, and modulated electronic structure, overcoming the limitations of single-component systems and establishing a strong position in electrochemical energy storage. This review summarizes recent advances in 2D MXenes/metal chalcogenide heterostructures for lithium-ion batteries (LIBs). This manuscript is divided into three sections: MXenes/metal sulfides, MXenes/metal selenides, and MXenes/metal tellurides. The synthetic strategies of heterostructures, including in situ conversion, confined growth, and intercalation self-assembly, are comprehensively introduced, and interfacial coupling mechanisms are mainly discussed. In addition, we summarize representative advances of heterostructures in lithium storage performance and reaction kinetics across various systems. Finally, we highlight key issues in current research, including unclear phase transition mechanisms, environmentally unfriendly and non-scalable preparation methods, and offer suggestions for improvements. And the future prospects of heterostructures in energy storage have also been outlined.