Recent advancements in Prussian blue analogues: Preparation and application in batteries

Prussian blue (PB) analogues, as an advanced type of inorganics, have garnered significant attention in various fields of electrochemical energy storage, such as sodium-, zinc-, and aluminum-ion batteries. Recent studies mostly concentrate on the structural analysis, morphological improvement of the materials, and electrochemical properties improvement of PB analogues when employed as electrodes for batteries. This paper summarizes the current process of PB analogues and their composites with other materials such as graphene or three-dimensional carbon sheets. The synthesis methods, structures, and morphologies of these composites are introduced and analyzed. Thereafter, we discuss their applications in sodium-, zinc-, and aluminum-ion batteries, as well as some corresponding flexible batteries. Finally, we provide their personal perspectives about some bottlenecks that existed in modern research and the challenges facing future advancements in this field.