CARBON MATERIAL AND ASPHALT-BASED NEGATIVE ELECTRODE MATERIAL FOR SODIUM-ION BATTERY, AND PREPARATION METHOD THEREFOR AND APPLICATIONS THEREOF

摘要

Disclosed in the present invention are a carbon material and asphalt-based negative electrode material for a sodium-ion battery, and a preparation method therefor and applications thereof. The negative electrode material for a sodium-ion battery is a composite carbon material whose surface is coated with an asphalt-based block-shaped or vertical channel-shaped material that is of an ordered carbon structure or whose morphology is irregular. Carbon materials and asphalt are used as precursor materials, the precursor materials are mechanically mixed and experience thermal treatment in the air, so that melted asphalt is coated on the surface of the carbon material, and then, the asphalt and the carbon materials experience carbonization and cracking reactions in an inert atmosphere at the same time, so as to obtain the composite carbon material having a structure whose surface is ordered and whose inside is disordered, the carbon materials comprising wood charcoal materials and bamboo charcoal materials in type, the wood charcoals comprising one or more mixtures obtained by mixing white charcoal, black charcoal, activated charcoal and machine-made charcoal, the bamboo charcoal materials comprising one or more carbonized material mixtures obtained by mixing phyllostachys pubescen, phyllostachys glauca, pleioblastus amarus, phyllostachys praecox and dendrocalamus membranaceus, and the asphalt materials being one or more mixtures obtained by mixing coal tar pitch, petroleum asphalt and natural bitumen.