bSodium-Ion Capacitorsb pbEnables readers to quickly understand core issues and field development of sodium-ion capacitorsb piSodium-Ion Capacitorsi summarizes and outlines the dynamics and development of sodium-ion capacitors, covering key aspects of the technology including background, classification and configuration, key technologies, and more, allowing readers to gain an understanding of sodium-ion capacitors from the perspective of both industrial technology and electrochemistry. piSodium-Ion Capacitorsi includes information on ulliEDLC-type mechanism of SCs and battery-type mechanism of SIBs, definition and types of pseudocapacitance, and energy storage mechanism of pseudocapacitorsli liCathode materials for sodium-ion capacitors, covering EDLC cathode materials, carbon nanotubes, reduced graphene oxide, and hollow carbon microspheresli liFlexible battery-type anode and capacitive cathode SICs cell configurations, including flexible electrodes based on carbon nanofiber, graphene