▎ 摘　　要

NOVELTY - Preparing poly aluminum-graphene-coated doped ternary material comprises e.g. mixing polyvinylpyrrolidone with liquid medium, adding graphene powder (same volume as polyvinylpyrrolidone) while stirring, carrying ultrasonic vibration treatment to obtain graphene solution; mixing the graphene solution and diluted solution to prepare polyaluminum graphene solution; uniformly mixing the doped ternary material having D50 particle size of 1 nm to 50 mu m and liquid medium to obtain mixed solution-2; mixing polyaluminum-graphene solution and mixed solution-2 to obtain mixed solution-3; dropping aqueous ammonia to mixed solution-3 under continuous stirring until acidity of solution is pH 8-12, aging, filtering and washing the filter residue to obtain filter residue as precursor-1; vacuum drying the precursor-1 to obtain dried precursor-2; placing the dried precursor-2 in pure oxygen atmosphere, heating from room temperature to 230-500 degrees C according to heating rate of 0.2-15 degrees C/minute. USE - The method is useful for preparing poly aluminum-graphene-coated doped ternary material. DETAILED DESCRIPTION - Preparing poly aluminum-graphene-coated doped ternary material comprises mixing polyvinylpyrrolidone (molecular weight of 1000-30,000) with 10 times the volume of liquid medium, adding graphene powder (same volume as polyvinylpyrrolidone) while stirring, carrying ultrasonic vibration treatment for 10-3 hours to obtain graphene solution; mixing the graphene solution and the diluted solution in the volume ratio of 1:1 to obtain poly-aluminum graphene solution; mixing uniformly the doped ternary material having D50 particle size of 1 nm to 50 mu m and liquid medium in the volume ratio of 1:(0.1-1000) to obtain mixed solution-2; mixing polyaluminum-graphene solution and mixed solution-2 in volume ratio of 1:1 to obtain mixed solution-3; dropping aqueous ammonia to mixed solution-3 under continuous stirring until acidity of solution is pH 8-12, aging at 50-90 degrees C for 5-48 hours, filtering and washing the filter residue to obtain filter residue as precursor-1; vacuum drying the precursor-1 at 150-260 to obtain dried precursor-2; placing the dried precursor-2 in pure oxygen atmosphere, heating from room temperature to 230-500 degrees C according to heating rate of 0.2-15 degrees C/minute, cooling to room temperature to prepare doped ternary anode material having layered alpha -NaFeO2 structure and coated with poly-aluminum graphene; where the diluted solution is 0.00001-20000 mmol/l polyaluminum sulfate or poly-aluminum chloride aqueous solution in the form of (AlO4Al12(OH)24(H2O)l2)7+; the doped ternary material simultaneously meets following characteristics: the diffraction peaks on XRD diffraction pattern all coincide with the characteristic diffraction peaks of layered alpha -NaFeO2 structure of joint committee on powder diffraction standard card 09-0063; at the rate of 0.2C and the first charge-discharge cycle, prepared button-type half-cell is charged to constant current of 4.6 V relative to constant current of lithium electrode, and ratio of the charged specific capacity is less than 25%; there is no diffraction peak corresponding to Li2MnO3 of joint committee on powder diffraction standard card 27-1252 at the 2 degrees angle of 20-25 degrees C of XRD diffraction pattern of the sample; the D50 particle size is the particle size corresponding to the cumulative particle size distribution percentage of sample reaching 50%.