▎ 摘　　要

NOVELTY - Preparing nitrogen-doped carbon nanomaterial comprises carbonizing polyterephthalaldehyde melamine/graphene oxide composite material under inert environment. USE - The nitrogen-doped carbon nanomaterial is useful in metal-sulfur battery anode and functional diaphragm which are useful for potassium-sulfur battery and lithium-sulfur battery. ADVANTAGE - The nitrogen-doped carbon nanomaterial: has both large specific surface area and pore volume, highly dispersed nitrogen atomic sites, and excellent electrical conductivity, and applying it to metal-sulfur batteries can actively solves the problems of the low conductivity of the sulfur anode in the metal-sulfur battery and shuttle effect of polysulfides in the reaction process, and can actively improves the electrochemical performance of the battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: Nitrogen-doped carbon nanomaterial is prepared by above mentioned method. Metal-sulfur battery anode, comprises current collector, and anode active material arranged on the surface of the current collector, anode active material comprises the nitrogen-doped carbon nanomaterial. Functional diaphragm; Potassium-sulfur battery; and Lithium-sulfur battery.