▎ 摘　　要

NOVELTY - Double carbon encapsulated composites material comprises three dimensional (3D) open-framework sea sponge-type carbon, reduced graphene oxide bilayer carbon framework and cobalt disulfide /cobalt oxide porous heterojunction nanoparticles. USE - The material is useful for sodium ion battery cathode material (claimed). ADVANTAGE - The composite material has good electrical conductivity, stable electrode structure, good energy storage performance, simple process, mild conditions, stable product morphology, high purity, convenient and simple product processing, and certain universality for the preparation of other carbon-based nanocomposite materials. DETAILED DESCRIPTION - An independent claim is also included for preparing double-carbon encapsulated cobalt disulfide /cobalt oxide porous heterojunction composite material comprising (i) preparing sea sponge-type carbon with the 3D open framework structure by ultrasonic spray pyrolysis, (ii) growing small-sized Co-ZIFs nanoparticles on the carbon skeleton of sea sponge-type carbon with the 3D open skeleton structure by regulating and controlling a surface hydrophilicity and hydrophobicity to obtain the intermediate I, (iii) in-situ vulcanizing the Co-ZIFs nanoparticles of the intermediate I by a gas-phase in-situ sulfidation method, and obtaining the intermediate II under the reduction of the carbon skeleton, (iv) adsorbing and assembling positively charged aminated graphene oxide on the surface with negative charges through an adsorption assembly method to obtain an intermediate III, and (v) annealing the intermediate III in an inert gas.