▎ 摘　　要

NOVELTY - The method for preparing alpha -iron oxide- alpha -iron oxyhydroxide/reduced graphene oxide composite cathode material involves (a) dispersing graphene oxide in deionized water using an ultrasonic generator to form a uniformly dispersed graphene oxide suspension (i), (b) adding analytically pure-soluble iron salt ferrous chloride to anhydrous ethanol, stirring to enable iron salt to be fully dissolved, adding iron salt to the suspension (i) to obtain a mixed solution of iron salt and graphene oxide, where the concentration of the iron salt is 0.05-0.5 mol/l and dispersing the mixed solution by an ultrasonic generator to obtain a suspension (ii), (c) pouring the suspension (ii) into a PTFE inner liner of homogeneous hydrothermal reactor, sealing the reactor, hydrothermally reacting and naturally cooling to obtain product (iii), (d) washing the product (iii) with water and alcohol and dispersing the washed product in water to obtain a product (iv), and (e) vacumm freeze-drying the product (iv). USE - Method is useful for preparing alpha -iron oxide- alpha -iron oxyhydroxide/reduced graphene oxide composite cathode material, which is useful in lithium ion battery. ADVANTAGE - The composite cathode material has large specific surface area and high conductivity. DETAILED DESCRIPTION - The method for preparing alpha -iron oxide- alpha -iron oxyhydroxide/reduced graphene oxide composite cathode material involves (a) ultrasonically dispersing graphene oxide in 25-40 ml deionized water using an ultrasonic generator to form a uniformly dispersed graphene oxide suspension (i), (b) adding analytically pure-soluble iron salt ferrous chloride to 10-25 ml anhydrous ethanol, stirring to enable iron salt to be fully dissolved, adding iron salt to the suspension (i) to obtain a mixed solution of iron salt and graphene oxide, where the concentration of the iron salt is 0.05-0.5 mol/l and ultrasonically dispersing the mixed solution by an ultrasonic generator to obtain a suspension (ii), (c) pouring the suspension (ii) into a PTFE inner liner of homogeneous hydrothermal reactor, sealing the reactor, hydrothermally reacting at 50-150 degrees C and naturally cooling to room temperature to obtain product (iii), (d) washing the product (iii) with water and alcohol and dispersing the washed product in water to obtain a product (iv), and (e) vacumm freeze-drying the product (iv) at a temperature of -20 degrees C to -50 degrees C and a vacuum degree of 10-60 Pa.