Carbon nanofiber composite material as well as preparation method and application thereof

The invention relates to a carbon nanofiber composite material as well as a preparation method and application thereof. A three-island type coaxial electrostatic spinning method is adopted, a polymer solution with the high carbon forming rate serves as a shell solution, a polymer solution with the low carbon forming rate serves as a core solution, the core solution is divided into three parts, transition metal carbide serves as a nanometer catalyst to be dispersed in the core solution, and through coaxial electrostatic spinning, the three-channel carbon fiber composite material with a core-shell structure is prepared, and transition metal carbide with a synergistic catalysis effect is loaded in the composite material. The method is high in operability, simple and environmentally friendly, the prepared three-channel carbon nanofiber composite material can be used as a positive electrode of a lithium-sulfur battery, and compared with a traditional lithium-sulfur battery, the prepared lithium-sulfur battery show