Composite graphite material as well as preparation method and application thereof

The invention provides a composite graphite material and a preparation method and application thereof, the composite graphite material comprises a porous graphite material, an asphalt-based carbon material and a nano carbon material, and the asphalt-based carbon material and the nano carbon material are filled in pores of the porous graphite material and coat the surface of the porous graphite material at the same time; the internal pores and the outer surface of the graphite composite material respectively comprise a conductive network formed by an asphalt-based carbon material and a carbon nanomaterial, and a filling and coating substance is an integral body, so that the structure is firm, the ionic conductivity and the electronic conductivity of the composite graphite material are improved, the internal resistance and the contact resistance are reduced, and meanwhile, the service life of the composite graphite material is prolonged. And the intercalation and deintercalation rates of lithium ions are also i