▎ 摘　　要

NOVELTY - Preparation of self-supporting flexible composite electrode material involves dispersing graphene oxide in a solvent, stirring and centrifuging to obtain graphene oxide solution, heating soluble transition metal salt, nitrilotriacetic acid and mixed solvent of water and isopropanol, washing and drying to obtain transition metal complex nanofiber, adding transition metal complex nanofiber to solvent, performing ultrasonic dispersion treatment for 5-30 minutes, adding aqueous carbon nanotube dispersion and graphene oxide solution, mixing, filtering, and performing laser sintering. USE - Preparation of self-supporting flexible composite electrode material used for lithium ion battery. ADVANTAGE - The method enables preparation of self-supporting flexible composite electrode material having excellent flexibility. A conductive network is formed by interlaced carbon nanotubes and graphene oxide obtained through hot reduction with laser, so as to provide a better electronic channel for active material particles. The composite electrode material has better active material proportion without using a binder and a current collector. The lithium ion battery using the self-supporting flexible composite electrode material has improved energy density and excellent electrochemical performance. DETAILED DESCRIPTION - Preparation of self-supporting flexible composite electrode material involves dispersing graphene oxide in a solvent for 2-12 hours, magnetically stirring for 12-24 hours and centrifuging to obtain graphene oxide solution, heating soluble transition metal salt, nitrilotriacetic acid and mixed solvent of water and isopropanol at 180-220 degrees C for 6-12 hours, washing and drying to obtain transition metal complex nanofiber, adding transition metal complex nanofiber to solvent, performing ultrasonic dispersion treatment for 5-30 minutes, adding aqueous carbon nanotube dispersion and graphene oxide solution, mixing for 6-18 hours, filtering, and performing laser sintering for 5-30 seconds. The obtained composite electrode material has thickness of 0.05-0.5 mu m. The mass ratio of graphene oxide solution, carbon nanotubes and transition metal complex nanofiber is 2-5:1-5:4-10.