▎ 摘　　要

NOVELTY - The lithium ion battery comprises lithium titanate-graphene composite negative electrode material, where the cathode material is obtained by using composite graphene and metal nanoparticles. The metal nanoparticles (M) are silver nanoparticles and copper nanoparticles. USE - Lithium ion battery used in portable electronic devices and electric vehicles. ADVANTAGE - The lithium ion battery present provides simple operation, less demanding conditions and low cost, and has excellent conductive performance, high specific capacity, good large rate discharge performance, and superior cycle characteristics. DETAILED DESCRIPTION - The lithium ion battery comprises lithium titanate-graphene composite negative electrode material, where the cathode material is obtained by using composite graphene and metal nanoparticles. The composite negative electrode material has general formula Li4Ti5O12/M-graphene. The metal nanoparticles (M) are silver nanoparticles and copper nanoparticles. An INDEPENDENT CLAIM is included for a method for manufacturing lithium titanate-graphene composite negative electrode material, which involves: (A) dispersing graphite in a solvent ultrasonically for 0.5-2 hours to obtain a colloidal solution; (B) dissolving pure lithium titanate in absolute ethanol to give a white emulsion; (C) adding the colloidal graphene oxide solution in the obtained white emulsion with sufficient stirring; (D) placing the obtained emulsion in stainless steel autoclave at 60-150 degrees C with stirring for 5-24 hours; (E) cooling at room temperature; and (F) drying to obtain the lithium titanate-graphene composite negative electrode material.