▎ 摘　　要

NOVELTY - Porous nitrogen-doped graphene carbon/ferrous oxide flexible composite material has three-dimensional porous foam structure. USE - Porous nitrogen-doped graphene carbon/ferrous oxide flexible composite material used in lithium ion battery(claimed). ADVANTAGE - The porous nitrogen-doped graphene carbon/ferrous oxide flexible composite material has good flexibility, high conductivity and high specific capacity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing nitrogen-doped graphene carbon/ferrous oxide flexible composite material, which involves: (A) preparing pure melamine foam and transferring into tubular furnace under nitrogen atmosphere where calcining temperature is 300-1200 degrees C for 1-10 hours to obtain nitrogen-doped carbon foam substrate, preferably calcining temperature of melamine foam is 800-1200 degrees C for 3-10 hours; (B) adding ferrous oxide solution into nano graphene oxide solution according to certain proportion with stirring with mass of 5-10%; (C) adding nitrogen-doped carbon foam matrix which is 8-10% polyvinyl pyrrolidone with constant to obtain spinning stock solution by using receiving device; (D) adopting high pressure electrostatic spinning technology of spinning solution directly on carbon foam substrate to obtain porous nitrogen-doped graphene oxide polyvinyl pyrrolidone carbon/ferrous oxide composite material of multi-nitrogen-doped graphene oxide at high temperature tube type resistance furnace followed by high temperature carbonization; and (E) cooling to obtain porous nitrogen-doped graphene carbon/ferrous oxide/flexible composite material.