▎ 摘　　要

NOVELTY - Preparation of positive electrode material involves dissolving nickel source, cobalt source, and sulfur source in deionized water and stirring to form an electrolyte, cutting graphene foam, soaking foam with ethanol, cleaning foam using deionized water, transferring electrolyte to electrolytic cell, using graphene foam as working electrode, electrodepositing petal-shaped nickel-cobalt-sulfur compounds on surface of graphene foam substrate by three-electrode electrochemical deposition, removing graphene foam from electrolytic cell, washing using ethanol and deionized water respectively, drying electrode material in an oven at 50-70 degrees C, vacuum-drying at 90-200 degrees C in vacuum drying box and cooling to room temperature. The nanosheet layers of positive electrode material are uniformly arrayed on surface layer of graphene foam. The positive electrode material exhibits three-dimensional fluffy petal-like structure. The molar ratio of cobalt ions to nickel ions to sulfur ions is 2:1:4. USE - Preparation of positive electrode material for flexible supercapacitor. ADVANTAGE - The method provides positive electrode material having excellent electrochemical energy storage performance, cycle stability, and excellent flexibility due to graphene foam. The morphology and properties of the material are modified to improve the electrical conductivity, ionic conductivity, and electron mobility. The nanosheets are evenly distributed and have larger reaction interface area with the electrolyte, which is beneficial to generate more electrochemical redox reaction charges, thereby achieving improvement in material properties.