▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene involves placing the raw material in a grinding device, adding a grinding medium, and grinding at a rotational speed of 50-10000 rpm under a nitrogen-containing atmosphere and at 0.1-200 MPa. The raw material is graphite material and/or graphene. The mass ratio of raw material to the grinding medium is 1:0.1-1000. USE - Preparation of nitrogen-doped graphene used in preparation of lithium-ion batteries, supercapacitors and catalysts e.g. oxygen reduction catalyst, hydrogen oxidation catalyst, water splitting catalyst, photocatalyst and biological sterilization catalyst (all claimed). ADVANTAGE - The method is simple, environmentally-friendly, safe, energy-saving, uses less equipment, and provides nitrogen-doped graphene having high and controllable nitrogen doping amount, high purity and adjustable specific surface area.