▎ 摘　　要

NOVELTY - Modification of anode active material involves dispersing surface-modified ternary material in ethanol, dripping ionic liquid, reacting to obtain ionic liquid-grafted modified ternary material, mixing ionic liquid-grafted modified ternary material and porous graphene sheet, dispersing in ethanol, heating to obtain porous graphene sheet-doped ionic liquid-grafted modified ternary material, adding bromopropylammonium salt and ionic liquid to ethanol, refluxing, recrystallizing to obtain amine-functionalized ionic liquid, dispersing surface-modified ternary material in ethanol, adding amine-functionalized ionic liquid, heating and stirring to obtain amine-functionalized ionic liquid-grafted modified ternary material, mixing reduced graphene sheet with amine-functionalized ionic liquid-grafted modified ternary material and N,N'-dicyclohexylcarbodiimide, adding to dimethylformamide, ultrasonically processing and heating to obtain ionic liquid-graphene grafted modified ternary material. USE - Modification of anode active material used for lithium slurry battery electrode (all claimed). ADVANTAGE - The method uses ionic liquid as connecting component during reaction to improve the surface and interface bonding force of the material. The anode active material has excellent structural stability and effectively improves the electrochemical cycle performance of the battery. DETAILED DESCRIPTION - Modification of anode active material involves preparing concentration gradient nickel-cobalt-manganese lithium ternary material by co-precipitation method, adding concentration gradient nickel-cobalt-manganese lithium ternary material to toluene, ultrasonically dispersing, adding silane compound (Rn'-SiX(4-n')) as silane coupling agent, stirring, washing, centrifuging and drying over toluene to obtain surface-modified ternary material, dispersing surface-modified ternary material in ethanol, dripping ionic liquid (IL) under protection of nitrogen, heating, reacting under stirring condition to obtain ionic liquid-grafted modified ternary material, mixing ionic liquid-grafted modified ternary material and porous graphene sheet, adding ethanol, ultrasonically dispersing, heating, stirring, washing, drying to obtain porous graphene sheet-doped ionic liquid-grafted modified ternary material, adding bromopropylammonium salt and ionic liquid to ethanol, heating, refluxing under protection of nitrogen, recrystallizing, purifying and drying to obtain amine-functionalized ionic liquid (IL'NH2), reacting porous graphene sheet in nitric acid to reduced porous graphene sheet containing carboxy and oxygen-containing groups on surface, dispersing the surface-modified ternary material in ethanol, slowly adding amine-functionalized ionic liquid under protection of nitrogen, heating and stirring to obtain amine-functionalized ionic liquid-grafted modified ternary material, mixing reduced porous graphene sheet material with amine-functionalized ionic liquid-grafted modified ternary material and N,N'-dicyclohexylcarbodiimide, adding to dimethylformamide, ultrasonically processing, heating, stirring to obtain ionic liquid-graphene grafted modified ternary material and using ionic liquid-graphene grafted modified ternary material and porous graphene sheet-doped ionic liquid-grafted modified ternary material as coated interface-connecting materials. n' = 1-3; R = non-hydrolyzable group, preferably methyl, ethyl or propyl;and X = hydrolyzable group, preferably halo or alkoxy. An INDEPENDENT CLAIM is included for the interface connecting-type anode active material.