Zinc Single‐Atom‐Regulated Hard Carbons for High‐Rate and Low‐Temperature Sodium‐Ion Batteries

Abstract Hard carbons, as one of the most commercializable anode materials for sodium‐ion batteries (SIBs), have to deal with the trade‐off between the rate capability and specific capacity or initial Columbic efficiency (ICE), and the fast performance decline at low temperature (LT) remains poorly understood. Here, a comprehensive regulation on the interfacial/bulk electrochemistry of hard carbons through atomic Zn doping is reported, which demonstrates a record‐high reversible capacity (546 mAh g −1 ), decent ICE (84%), remarkable rate capability (140 mAh g −1 @ 50 A g −1 ), and excellent LT capacity (443 mAh g −1 @ −40 °C), outperforming the state‐of‐the‐art literature. This work reveals that the Zn doping…