▎ 摘　　要

NOVELTY - The preparation of N-doped three-dimensional graphene/graphite anode material involves mixing graphite oxide, nitrogen compounds and reducing agent, ultrasonically dispersing in deionized water, heating, adding graphite to above liquid, stirring, heating to obtain graphene/graphite composite, drying, carrying out calcination of three-dimensional graphene/graphite composite electrode material, mixing electrode material, acetylene black and polyvinylidene fluoride binder to obtain mixture, coating mixture on copper foil surface to obtain cell electrode sheet. USE - Preparation of N-doped three-dimensional graphene/graphite anode materials for lithium ion battery (claimed). ADVANTAGE - The method enables preparation of N-doped three-dimensional graphene/graphite anode materials that provides lithium ion battery having 90% or more charge-discharge specific capacity after 100 times of cycling, excellent performance and cycling stability. DETAILED DESCRIPTION - The preparation of N-doped three-dimensional graphene/graphite anode material involves mixing graphite oxide, nitrogen compounds and reducing agent, ultrasonically dispersing in deionized water, heating the reaction to form a thick liquid dispersion, adding graphite to dispersion liquid, stirring in a high pressure reactor, heating to obtain N-doped graphene/graphite composite, drying, carrying out calcination of three-dimensional graphene/graphite composite electrode materials at high temperature in an inert gas atmosphere, mixing electrode material, acetylene black and polyvinylidene fluoride binder to obtain mixture, coating mixture on copper foil surface to obtain cell electrode sheet. Celgard (RTM: Microporous polypropylene film) is used as separator, l mol/l Lithium hexafluorophosphate solution in ethylene carbonate and dimethyl carbonate (volume ratio 1:1) is used as electrolyte. The electrode sheet is used as a positive electrode, and lithium sheet is used as a negative electrode. The half cell is assembled in a glove box for testing charge-discharge performance.