▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene involves providing a dispersion of fluorinated graphite, ultrasonically processing, mechanically treating and/or thermally treating the dispersion, contacting the obtained product with an azide reagent at 40-200 degrees C, separating the formed solid product from the mixture, and dialyzing the obtained product against water. USE - Preparation of nitrogen-doped graphene used as supercapacitor material in electrical cell (all claimed). ADVANTAGE - The method produces graphene with high nitrogen doping and some residual fluorine content. The supercapacitor electrodes obtained using the nitrogen-doped graphene has high volumetric energy density at a high power density and high capacitance cycle stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) nitrogen-doped graphene, which contains at least 8.9 atomic% nitrogen and up to 16.6 atomic% fluorine with respect to total atoms present in the sample as determined by X-ray photoelectron spectroscopy (XPS) using an aluminum source (Al-K alpha ). The nitrogen-doped graphene has a density of above 1 g/cm3 when pressed at 80 kN for 1 minute; and (2) electrical cell, which comprises at least two electrodes, a separator and an electrolyte. At least one electrode contains the nitrogen-doped graphene.