▎ 摘　　要

NOVELTY - Preparing ultra-high edge nitrogen-doped carbon nanosheets comprises (i) grafting reactive macromolecules containing acid groups on the surface of graphene oxide to prepare graphene oxide-polymer molecular brushes; (ii) adding the nitrogen-rich small molecules containing amino groups to the aqueous solution of graphene oxide-polymer molecules, stirring, hydrothermally reacting and freeze-drying, and obtaining the self-assembled complex; and (iii) carbonizing the self-assembled composite in an inert gas to obtain ultra-high-edge nitrogen-doped carbon nanosheets. The reactive polymer is polyacrylic acid, polystyrene sulfonic acid, and/or polystyrene boric acid. The nitrogen-rich small molecules are melamine, urea, thiourea, cyanamide, and/or dicyandiamide. USE - The nanosheets are useful in potassium ion battery (claimed). ADVANTAGE - The nanosheets significantly improves the utilization of active sites and ion transport capabilities, and exhibits excellent rate performance and cycle stability when used as anodes for potassium-ion batteries. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for ultra-high edge nitrogen-doped carbon nanosheets prepared by the above method.