▎ 摘　　要

NOVELTY - The preparation method of three-dimensional graphene-loaded cobalt(II) oxide quantum dot composite electrode material involves adding oleylamine to ethanol solution to obtain solution (A), adding cobalt salt, sodium oleate and precipitating agent into solution (A), and stirring to obtain solution (B), adding graphene oxide into the solution (B), and stirring to obtain suspension (C), ultrasonically processing the suspension (C), and hydrothermally reacting to obtain precipitate, separating precipitate, washing and drying to obtain precursor, reacting in furnace, and cooling. USE - Preparation method of three-dimensional graphene-loaded cobalt(II) oxide quantum dot composite electrode material (claimed). ADVANTAGE - The method enables preparation of three-dimensional graphene-loaded cobalt(II) oxide quantum dot composite electrode material with small size, excellent electronic transmission and stability, accelerates the reaction speed during charging and discharging, increases reactive site, and alleviates the volume expansion caused by the ion insertion and extraction during the charge-discharge process. DETAILED DESCRIPTION - The preparation method of three-dimensional graphene-loaded cobalt(II) oxide quantum dot composite electrode material involves (1) adding oleylamine to ethanol solution according to the volume ratio of (1-5):60 to obtain solution (A), (2) adding cobalt salt, sodium oleate and precipitating agent into the solution (A), and uniformly stirring to obtain solution (B), where the ratio of cobalt salt, sodium oleate and ethanol solution in step (1) is (0.5-3) mmol:(0.5-3) mmol:70 ml, (3) adding the graphene oxide into the solution (B), and uniformly stirring to obtain suspension (C), where the ratio of graphene oxide and ethanol solution in the step (1) is (0.06-0.12) g:60 ml, (4) ultrasonically processing the suspension (C), and hydrothermally reacting under microwave condition to obtain precipitate, (5) separating the precipitate, washing and drying to obtain precursor, and (6) placing the precursor in furnace at 300-500 degrees C in atmosphere, maintaining the temperature for 1-3 hours, and cooling to room temperature.