▎ 摘　　要

NOVELTY - Preparing cobalt tetroxide nanobelt-nitrogen-doped graphene hybrid material involves weighing a certain amount of graphene oxide and dispersing in deionized water and ethylene glycol mixed solvent under ultrasonic conditions, after ultrasonic dispersion, adding the weighed cobalt nitrate hexahydrate, dissolving, and adding the weighed urea to obtain a mixed solution. The mixed solution is transferred to the hydrothermal still, and reacted to the set time at the set temperature, naturally cooled to room temperature, and obtained the precursor material after washing and drying. The precursor material is first reacted at the pretreatment temperature for a certain period of time, and raised the heat treatment temperature to a high temperature region, and naturally cooled to room temperature to prepare cobalt tetroxide nanobelt-nitrogen-doped graphene hybrid material. USE - Method for preparing cobalt tetroxide nanobelt-nitrogen-doped graphene hybrid material for lithium ion secondary battery as a negative electrode active material (claimed). ADVANTAGE - The method combines the high energy density of cobalt tetroxide, the high conductivity of nitrogen-doped graphene, and the in-situ recombination of hybrid materials, and maximizes the synergistic effect of various factors to improve the lithium storage performance of hybrid materials. The specific capacity of the hybrid material is 1249 milliampere hour/g at a current density of 100 milliampere hour/g, and the specific capacity of 1221 milliampere hour/g still be maintained after 100 cycles, at a high current density of 5 ampere/g, the specific capacity reaches 500 milliampere hour/g. The obtained material has excellent electrochemical performance and has broad application prospects in lithium storage.