Method for preparing core-shell composite sulfide material through two-step method

The invention relates to the field of manufacturing of thermal batteries and normal-temperature lithium primary battery electrode materials, in particular to a method for preparing a core-shell composite sulfide material through a two-step method. The method comprises the following steps: forming a metal cobalt layer which is uniformly distributed on the surface of FeS2 powder particles through a chemical plating method to obtain a precursor material; then carrying out vulcanization treatment on the precursor material; and obtaining the core-shell composite sulfide material. When the prepared shell cobalt disulfide accounts for 2.5-14.6% of the total mass of the core-shell composite sulfide material, the core-shell composite positive electrode material is used as a positive electrode material; after a thermal battery is assembled, the thermal battery is subjected to constant-current discharge at the working temperature of 520 DEG C and the current density of 200mA/cm < 2 >, and when the cut-off voltage is 1.6