Fast‐Charging Anode Materials for Sodium‐Ion Batteries

Abstract Sodium‐ion batteries (SIBs) have undergone rapid development as a complementary technology to lithium‐ion batteries due to abundant sodium resources. However, the extended charging time and low energy density pose a significant challenge to the widespread use of SIBs in electric vehicles. To overcome this hurdle, there is considerable focus on developing fast‐charging anode materials with rapid Na⁺ diffusion and superior reaction kinetics. Here, the key factors that limit the fast charging of anode materials are examined, which provides a comprehensive overview of the major advances and fast‐charging characteristics across various anode materials. Specifically, it systematically dissects considerations to enhance the rate performance of anode materials, encompassing aspects such as porous engineering, electrolyte desolvation strategies, electrode/electrolyte interphase, electronic conductivity/ion diffusivity, and pseudocapacitive ion storage. Finally, the direction and prospects for developing fast‐charging anode materials of SIBs are also proposed, aiming to provide a valuable reference for the further advancement of high‐power SIBs.