Unraveling the Nature of Excellent Potassium Storage in Small‐Molecule Se@Peapod‐Like N‐Doped Carbon Nanofibers

molecules, thus significantly enhancing the utilization of Se and effecting the voltage platform of the K-Se battery. This work offers a practical pathway to optimize the K-Se battery performance through structure engineering and manipulation of selenium chemistry for the formation of selective species and reveal its internal reaction mechanism in the carbonate electrolyte.