Asphalt-based porous carbon quantum dot material as well as preparation method and application thereof

The invention relates to the technical field of sodium ion batteries, in particular to an asphalt-based porous carbon quantum dot material as well as a preparation method and application thereof. The preparation method comprises the following steps: heating and pyrolyzing asphalt powder to obtain a pyrolyzed material, pickling the pyrolyzed material, adding a pore-forming agent into the pickled solution to carry out hydrothermal reaction, carrying out centrifugal separation, dialysis and drying on the obtained solution, and carrying out high-temperature carbonization in an inert atmosphere to obtain the carbon quantum dot material with the ultra-microporous structure, namely the porous carbon quantum dots. Compared with a traditional conductive agent, the porous carbon quantum dots can provide more sodium storage sites, and the energy density and the power density of the sodium ion battery are improved. The conductive agent is prepared from asphalt as a raw material, the preparation cost is greatly reduced, t