How to control the reaction conditions when reacting ammonium carbonate with lithium sulfate to produce lithium carbonate

A method for preparing carbon/lithium sulfide composite cathode materials for lithium-sulfur batteries via carbothermal reduction of lithium sulfate, characterized in that carbon/lithium sulfate or carbon precursor/lithium sulfate is used as the raw material, which is heated under an inert gas atmosphere; through carbothermal reduction, lithium sulfate is reduced to lithium sulfide, thereby yielding the carbon/lithium sulfate composite material. The specific steps include: 1) Mixing a solution containing lithium sulfate with carbon material or its precursor in a certain ratio to form the carbon/lithium sulfate or carbon precursor/lithium sulfate composite material； 2) The resulting carbon/lithium sulfate or carbon precursor/lithium sulfate composite material is heated to 400°C–1400°C under an inert atmosphere, where lithium sulfate is reduced to lithium sulfide through carbothermal reduction. The chemical reactions that occur during this process are: Li2SO4 + C = Li2S + CO2, Li2SO4 + C = Li2S + CO, and CO2 + C ⇌ 2CO.