Nitrogen-doped spherical porous carbon and preparation method and application thereof

The invention provides nitrogen-doped spherical porous carbon and a preparation method and application thereof. The preparation method comprises the steps that coal liquefied asphalt is sulfonated andhydrated in sequence to obtain soluble sulfonated asphalt; the soluble sulfonated asphalt, water and imidazolium cation type ionic liquid are mixed to obtain a mixed solution, wherein the imidazoliumcation type ionic liquid is imidazolium cation bromide salt or chlorine salt; the mixed solution is spray-dried to obtain spherical asphalt particles; under the protection of nitrogen or an inert gas, the spherical asphalt particles are carbonized and activated in sequence to obtain the nitrogen-doped spherical porous carbon. The nitrogen-doped spherical porous carbon prepared by using the imidazolium cation bromide salt or chloride salt has a higher nitrogen content; the preparation technology adopting a spray drying technology has the advantages that the steps are simple, the continuous operability is strong, the pr