▎ 摘　　要

NOVELTY - Composite nanofibers comprise a porous nanofiber matrix, and a structure distributed on the surface of the matrix. The structure is a composite nanofibers comprising a cobalt oxide and an N-doped graphite carbon layer. The N-Doped graphitic carbon layer is coated on a surface of a hollow-shaped hollow nanosphere shape. The porous nanofiber matrix comprises reduced-graphene oxide. The composite nanofibers are dispersed in the porous nano-ferment matrix. USE - The composite nanofibers are used as anode material for lithium ion battery (claimed). ADVANTAGE - The nanofiber has stable structure, large specific surface area, excellent electrical conductivity, excellent lithium storage properties including excellent speed performance and cycling stability due to unique nanostructure, relieves volume expansion in charging/discharging process, allows liquid electrolyte to penetrate the electrode efficiently, enables ion and electron diffusion, and has excellent rate performance.