▎ 摘　　要

NOVELTY - Lithium ion battery composite negative electrode material preparation involves selecting ferrous sulfate salt as transition metal oxide raw material, and graphene oxide as carbon skeleton material precursor body, and then adding excessive amount of ammonia as a precipitating agent and a reducing agent to achieve coordination bonding between ferrous sulfate salt and graphene oxide at a lower temperature. The low temperature hydrothermal treatment is carried out to achieve dense iron oxide nanoparticles graphene skeleton. USE - Method for preparing lithium ion battery composite negative electrode material used in button cell (claimed). ADVANTAGE - The method effectively improves conductivity of carbon composite material to enhance lithium-ion insertion and extraction during charge and discharge, as well as electron transport capacity, slow down volumetric expansion of iron (III) oxide nanoparticles during charge-discharge process, and thus effectively enhances lithium cyclic stability and electrochemical performance of ion batteries. DETAILED DESCRIPTION - Lithium ion battery composite negative electrode material preparation involves selecting ferrous sulfate salt as transition metal oxide raw material, and graphene oxide as carbon skeleton material precursor body, and then adding excessive amount of ammonia as a precipitating agent and a reducing agent to achieve coordination bonding between ferrous sulfate salt and graphene oxide at a lower temperature. The low temperature hydrothermal treatment is carried out to achieve dense iron oxide nanoparticles graphene skeleton. The graphene oxide dispersion is added to deionized water under ultrasonic conditions with stirring to obtain brown yellow graphene oxide solution. The ferrous sulfate is dissolved in deionized water with stirring ferrous ion solution, where the ferrous ion solution is quickly added into the graphene oxide solution. The excess ammonia is added to the precursor solution to obtain a black solid. The obtained black solid is washed and freeze-dried to obtain the ion battery composite negative electrode material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic scanning electron microscope image of the prepared lithium ion battery composite negative electrode material.