▎ 摘　　要

NOVELTY - A nitrogen-doped carbon nanosheet/MXene composite nanomaterial is prepared by using carbon nanosheets and MXene to form an interleaved sheet structure, and doping nitrogen in carbon nanosheets and MXene. USE - Nitrogen-doped carbon nanosheet/MXene composite nanomaterial for preparing electrode sheet for three-electrode test system for supercapacitors (all claimed). ADVANTAGE - The composite material can effectively overcome the defects of stacking and accumulation of MXene itself, and greatly improve the cycle stability of the battery. The redox reaction and pseudocapacitance active sites with obvious interlayer spacing of MXene are increased, and the specific capacity of the supercapacitor is increased. The preparation method is simple and suitable for large-scale industrial production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the nitrogen-doped carbon nanosheet/MXene composite nanomaterial; and (2) preparation of electrode sheet, which involves (1) mixing the nitrogen-doped carbon nanosheets/MXene composite nanomaterial, conductive agent, binder and solvent to obtain a nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry, and (2) coating the nitrogen-doped carbon nanosheet/MXene composite nanomaterial slurry on a current collector.