Fast‐Charging and Long‐Cycle Sodium‐Ion Batteries Enabled by an Ultra‐Stable Carbon Anode

Abstract The realization of rapid‐charging sodium‐ion batteries (SIBs) with exceptional power density represents a pivotal challenge for next‐generation electric vehicles. Currently, carbonaceous anodes are considered the most technologically mature yet rate‐limited candidate approaching commercialization. To address the bottlenecks of slow ion transport and interfacial instability in conventional carbon architectures, a hierarchical anode material has been designed by incorporating g‐C 3 N 4 electronic inert layer onto hollow carbon spheres (CN@HCS). This structure not only facilitates Na⁺ diffusion but also effectively suppresses side reactions, while enabling selective screening of electrons. As a result, the material exhibits outstanding rate capabilities, maintaining high performance even at a current density as high as 40 A g −1 , and demonstrates remarkable cycling stability over 40 000 cycles with negligible capacity decay. Consequently, the full battery enables rapid charging within 0.1 h and delivers a prolonged discharge duration of up to 1 h, accompanied by a high power density of 21 600 W kg −1 (cathode + anode) . This work represents a significant advancement in the development of advance anode materials for SIBs.