▎ 摘　　要

NOVELTY - Lithium ion battery negative electrode material has core-shell structure, where inner core is hard carbon, and outer shell is fluorinated graphene. USE - Lithium ion battery negative electrode material used in battery (claimed). ADVANTAGE - The lithium ion battery negative electrode material enables to meet rapid charge and discharge inside electrode; realizes dense solid electrolyte interface film outside negative electrode; has low lithium ion transport and low interface impedance, which achieves high negative electrode materials; and improves rate performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing negative electrode material, which involves: (A) preparing hard carbon material, and fluorinated graphene into tris buffer solution of dopamine; and (B) stirring, filtering, washing, drying, and baking under inert atmosphere to obtain negative electrode material.