Composite sulfur positive electrode material and preparation method thereof, and composite sulfur positive electrode and preparation method thereof

The invention provides a composite sulfur positive electrode material and a preparation method thereof, and a composite sulfur positive electrode and a preparation method thereof, and belongs to the technical field of new energy. The preparation method of the composite sulfur positive electrode comprises the following steps: respectively dissolving inorganic zinc salt and 2-methylimidazole in methanol, and reacting the inorganic zinc salt and the 2-methylimidazole to obtain a ZIF-8 precursor after the reaction is finished; a ZIF-8 precursor is taken and dispersed in a buffer solution, dopamine hydrochloride, inorganic ferric salt and inorganic cobalt salt are added for a reaction, and CoFe-PDA-coated ZIF-8 is obtained after the reaction is finished; the preparation method comprises the following steps: mixing CoFe-PDA (at) ZIF-8 and a nitrogen source, performing pyrolysis, and purifying a pyrolysis product to obtain an intermediate; and uniformly mixing the intermediate with sublimed sulfur, and meanwhile, ca