Advanced Carbon Materials for Sodium‐Ion Capacitors

Abstract Nonaqueous sodium‐ion capacitors (SICs), as a new type of energy storage cell, can potentially achieve high energy‐power densities, long cycling lifespan, and low cost in one device. Given this, developing suitable carbonaceous electrode materials for carbon‐based SICs is of great significance. Unlike lithium‐ion batteries (LIBs) and lithium‐ion capacitors (LICs) that have been successfully commercialized, SICs are still at an early stage. As a result, rational electrode material design for SICs is needed to meet the requirements of electrochemical energy‐storage systems. Carbon materials with a wide range of sources and low toxicity deliver significant potential applications in high‐performance SICs, whether as positive or negative parts. Various carbonaceous electrode materials have been explored and investigated for developing SICs over the past years. This Review firstly introduces the classical and widely used configurations and corresponding energy‐storage mechanism in detail for SICs. Then, recent progress on carbonaceous electrode materials, including cathode and anode materials, are summarized. Finally, the challenges and some suggestions on the future development of carbon‐based SICs are proposed.