Heterogeneous transition metal dichalcogenides/graphene composites applied to the metal-ion batteries

• The construction of TMDs/Gr heterostructures are introduced. • The related properties of TMDs/Gr heterostructures are discussed. • The metal-ion batteries using TMDs/Gr electrodes are comprehensively reviewed. • The thin film electrodes will be a mainstream for the metal-ion batteries. Two-dimensional (2D) transition metal dichalcogenides (TMDs) are graphene-like layered materials with unique structures and characteristics. These structures and properties make them have great potential in the field of electrochemistry, especially heterogeneous TMDs/Graphene (Gr) composites are the ideal energy storage materials with large specific surface area, excellent mechanical properties, high conductivity, and high electrochemical stability. This article systematically reviews the important progress made by the TMDs/Gr heterostructures used in metal-ion batteries recently. The focus is on the construction of TMDs/Gr heterostructures, related physical properties, and their application in metal-ion batteries. The merits and drawbacks of different preparation methods are summarized and discussed. The performance of TMDs/Gr composites as the electrode materials for various metal-ion batteries is reviewed and investigated. This review aims to provide a reference for the electrochemical research of TMDs/Gr composites and outline the prospects and future challenges of them applied to the metal-ion batteries.