Titanium-based two-dimensional (2D) and layered compounds with open and stable crystal
structures have attracted increasing attention for energy storage and conversion purposes, e.g., rechargeable alkali-ion batteries and hybrid capacitors, due to their superior rate capability derived from
the intercalation-type or pseudocapacitive kinetics. Various strategies, including structure design, conductivity enhancement, surface modification, and electrode engineering, have been implemented to
effectively overcome the intrinsic drawbacks while simultaneously maintaining their advantages as
promising and competitive electrode materials for advanced energy storage and conversion. Here, we
provide a comprehensive overview of the recent progress on Ti-based compound materials for high-rate and low-cost electrochemical energy storage applications (mainly on rechargeable batteries and
supercapacitors). The energy storage mechanisms, structure-performance relations, and performance-optimizing strategies in these typical energy storage devices are discussed. Moreover, major challenges
and perspectives for future research and industrial application are also illustrated.