Preparation method of graphene-based nanocomposite material having three-dimensional porous structure

The invention relates to a preparation method of a graphene-based nanocomposite material having a three-dimensional porous structure, and belongs to the technical field of nanocomposite material. Firstly, nanoparticles are subjected to hydrothermal carbon coating to obtain carbon precursor-coated nanoparticles; then the carbon precursor-coated nanoparticles and graphene oxide are self-assembled under a hydrothermal condition to obtain a three-dimensional porous grapheme-based nanocomposite material precursor; and finally, the obtained three-dimensional porous grapheme-based nanocomposite material precursor is subjected to high-temperature heat treatment to obtain the three-dimensional porous grapheme-based nanocomposite material. The nanocomposite material prepared by the method not only has a three-dimensional carbon network structure composed of graphene and a carbon shell, but also has a porous structure, and has quite good application prospects in lithium ion batteries, super capacitors and catalysis fields.