▎ 摘　　要

NOVELTY - The method for preparing graphene and nitrogen-doped carbon co-coated porous lithium titanate involves (a) mixing graphene oxide, titanium source and organic ligand with a solvent, (b) carrying out heating reaction on the precursor solution to obtain graphene-based titanium metal-organic framework compound, and (c) mixing the graphene-based titanium metal-organic framework compound with lithium source, ball-milling under an inert atmosphere and calcining to obtain graphene and nitrogen-doped carbon co-coated porous lithium titanate. USE - Method is useful for preparing graphene and nitrogen-doped carbon co-coated porous lithium titanate, which is useful in a lithium ion battery, an electric automobile, an electric bicycle and an energy storage material (claimed). ADVANTAGE - The method enables rapid and easy preparation of the porous lithium titanate with uniform particle size and porosity, stable structure and excellent electrochemical performance, rate performance and conductivity, in an environmentally-friendly manner. DETAILED DESCRIPTION - The method for preparing graphene and nitrogen-doped carbon co-coated porous lithium titanate involves (a) mixing graphene oxide, titanium source and organic ligand with a solvent under stirring condition to enable the substances to be uniformly dispersed to obtain a precursor solution, (b) carrying out heating reaction on the precursor solution for a certain period of time to obtain graphene-based titanium metal-organic framework compound, and (c) mixing the graphene-based titanium metal-organic framework compound with lithium source, ball-milling under an inert atmosphere and calcining to obtain graphene and nitrogen-doped carbon co-coated porous lithium titanate. The titanium source is tetra-n-butyl titanate or potassium titanium oxalate. The organic ligand is 2-aminoterephthalic acid, 5-aminoisophthalic acid, 3-aminobenzoic acid, p-aminobenzoic acid, anthranilic acid or m-aminobenzoic acid. The organic solvent is dimethylformamide, methanol, ethanol or deionized water. The lithium source is lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium acetate, lithium hydroxide, lithium oxide, lithium fluoride, lithium dihydrogen carbonate or lithium oxalate. The inert atmosphere is argon or nitrogen.