METHOD FOR PREPARING GRAPHENE/ZIRCONIA HOLLOW SPHERE/SULFUR COMPOSITE MATERIAL

摘要

A method for preparing a graphene/zirconia hollow sphere or a sulfur composite material, the method comprising the following steps: (1) weighing and adding a nano calcium carbonate powder to an anhydrous ethanol, and carrying out ultrasonic treatment to form a suspension; (2) weighing and dissolving zirconium dichloride and yttrium chloride in deionized water, and preparing into an aqueous solution; (3) adding the aqueous solution obtained from step (2) into the suspension in water bath, and adding an ammonia water adjustment value to obtain a white solid; (4) placing the white solid in a muffle furnace, following cool down, placing the white solid in an acetate solution, stirring the mixture solution and removing calcium carbonate to obtain hollow zirconia; and (5) adding the obtained hollow zirconia, elemental sulfur and graphene into the carbon disulfide to obtain the composite material. By using the sulfur-based material to coat the graphene/zirconia hollow sphere or the zirconia hollow sphere in the sulfur composite material, the dissolving of a discharging product polysulfide may be prevented, the volume expansion may be reduced, and the electrochemical performance thereof may be improved.