Sodium-ion capacitors represent a novel class of energy storage device that integrates the respective advantages of sodium-ion batteries and electric double-layer capacitors. Nevertheless, the mismatch between the positive and negative electrode kinetics of sodium ion capacitors can lead to their low power density and poor cycling stability. Since the advent of single-atom catalysis, single-atom metals have garnered substantial attention in energy storage research due to their high atomic efficiency, exceptional catalytic activity, superior selectivity, and remarkable stability.Firstly, the challenges faced by electrode materials for sodium ion capacitors were elaborated, and the energy storage mechanism of sodium ion capacitors was analyzed. Secondly, the characteristics of single atom catalysts and the preparation methods of carbon supported metal single atom materials were introduced. Then, the application progress of metal monatomic materials in sodium ion capacitors was summarized. Finally, the application prospects of metal single atoms in sodium ion capacitors were discussed.

As carbon peak and carbon neutrality become a global consensus,electrochemical energy storage technologies and related industries have been developing rapidly.The demand for electrode materials is also increasing steadily.How to prepare high?performance anode materials with widely available and low?cost precursors has thus become a research hot spot both in China and abroad.Coal is the most promising precursor for anode materials because of its high carbon content,abundant reserves,and low price.In recent years,researchers have prepared various anode materials,such as amorphous carbon,graphite,carbon nanotubes, and graphene,from coal and studied their application in lithium?ion batteries in depth.This paper summarized the research progress of three typical coal?based carbon anode materials in lithium?ion batteries.Then, it reviewed their synthesis methods,optimization and modification,and electrochemical performance.Finally,the paper presented an outlook on the development and application of coal?based carbon anode materials.