Nano-structure graphite material as well as preparation method and application thereof

The invention provides a nano-structure graphite material and a preparation method and application thereof.The main body structure of the nano-structure graphite material comprises a highly-graphitized graphite shell and highly-graphitized multi-walled carbon nanotubes, the graphite shell and the multi-walled carbon nanotubes are crosslinked to form a conductive carbon network, and the conductive carbon network comprises, by mass, 1%-5% of graphene, 1%-5% of graphene and 1%-5% of graphene. In the nano-structure graphite material, the proportion of the multi-walled carbon nanotubes is 20-25%, and the proportion of graphitized carbon is greater than 98%. The preparation method of the nano-structure graphite material comprises the following steps: S1, mixing iron-based MOF and glucose, and then carrying out high-temperature sintering in an inert atmosphere at the temperature of 1000-1100 DEG C for 4-6 hours; and S2, sintering the product obtained in the step S1 in air at low temperature to remove amorphous carbo