▎ 摘　　要

NOVELTY - Lithium-ion battery negative electrode material comprises crystalline carbon substrate, nitrogen-doped carbon nanotube uniformly dispersed on crystalline carbon substrate, and cobalt-cobalt oxide nanoparticle coated inside carbon nanotube. The surface of the carbon nanotube has a porous structure, and the carbon nanotube and the cobalt (Co)-cobalt oxide (CoO) nanoparticle form a pea pod structure. USE - Lithium-ion battery negative electrode material used as negative electrode sheet of lithium-ion battery (all claimed). ADVANTAGE - The lithium-ion battery negative electrode material has improved electron and ion transport, promoted electrolyte infiltration, greatly improved energy density, and improved the electrochemical performance, greatly improved rate performance and cycle stability of the lithium-ion battery. The prepared carbon nanotube on the crystalline carbon substrate has high porosity, good dispersion and stable structure, and at the same time realize the wrapping of high-capacity Co/CoO nanoparticles, effectively inhibited their expansion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing lithium-ion battery negative electrode material, which involves: (a) dissolving the cobalt source and polyvinylpyrrolidone in water to obtain a mixed solution; (b) vacuum pressing the obtained mixed solution into a crystalline carbon substrate;drying to obtain a powder precursor; (c) calcining the obtained powder precursor at a high temperature; and (d)activating at a high temperature to obtain a lithium-ion battery negative electrode material.