▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene-metal oxide nanocomposite material, involves (i) reacting graphene oxide or partially reduced graphene with nitrogen-enriched material, naturally cooling, suction-filtering, washing with deionized water and drying to obtain nitrogen-doped graphene, (ii) ultrasonically dispersing nitrogen-doped graphene in metal salt/organic solution, dripping deionized water to obtain homogeneous dispersion of mixture of metal salt and nitrogen-doped graphene, (iii) performing solvothermal reaction, cooling naturally, (iv) suction-filtering, washing and drying. USE - Preparation of nitrogen-doped graphene-metal oxide nanocomposite material for use in lithium ion batteries and super-capacitors. ADVANTAGE - The nitrogen-doped graphene-metal oxide nanocomposite material is prepared by a simple method at low cost. The nitrogen-doped graphene-metal oxide nanocomposite material has excellent operability and repeatability. The method solves the problem of non-uniformity of the particle size of the metal oxide particles on the surface of the graphene surface, and solves the problem of the nitrogen-doped content of the carrier in the composite material is not high. DETAILED DESCRIPTION - Preparation of nitrogen-doped graphene-metal oxide nanocomposite material, involves (i) reacting graphene oxide or partially reduced graphene with nitrogen-enriched material at 80-200 degrees C for 0.5-48 hours, naturally cooling, and carrying out suction filtration on the obtained product, washing with deionized water and drying to obtain nitrogen-doped graphene, (ii) ultrasonically dispersing the obtained nitrogen-doped graphene in metal salt/organic solution having a concentration of 0.002-1.0 mol/L, then dripping deionized water where dosage ratio of metal salt and deionized water is 1.0x 10-5-1.0x 10-2:1 mol/mL, and obtaining homogeneous dispersion of mixture of metal salt and nitrogen-doped graphene, (iii) transferring the dispersion to a reaction vessel, controlling the temperature to 80-240 degrees C, and maintaining for 0.1-72 hours, then carrying out solvothermal reaction, cooling naturally, (iv) carrying out suction filtration on the product obtained in step (iii), washing, drying and obtaining nitrogen-doped graphene-metal oxide nanocomposite material.