Abstract: A method for preparing high-purity lithium sulfide by using industrial-grade butyllithium includes the following steps: step A: under an inert gas condition, thoroughly mixing 1.5-2.5 g of lithium chloride, 0.5 L of an industrial-grade n-butyllithium solution (2.5 mol/L) and 1.5-2.5 L of n-hexane to obtain a mixed solution, and charging the mixed solution into a sealed container; step B: under the sealed condition, firstly introducing H2S gas into a gas-washing bottle through a submerged pipe at a rate of 10.5 L/h, then introducing into the mixed solution through the submerged pipe, controlling the reaction temperature at 25-40° C., and continuously stirring for reaction for 4-6 h to obtain a reaction slurry; and step C: under an inert gas condition, filtering the reaction slurry with a G3 sand core funnel to obtain a crude lithium sulfide solid wet material.

Abstract: A method for preparing lithium sulfide by using metallic lithium includes: step A: placing 0.05-0.1 kg of metallic lithium and a corresponding sulfur powder into a 5-10 L sealed container under an inert condition according to a mass ratio of 1:0.8-1:1; step B: placing the sealed container charged with lithium and the sulfur powder in step A into a vacuum oven at 250-300° C. and holding for 2-3 h, then adding an equal amount of sulfur as in step A followed by heat preservation for 2-3 h, and finally adding an equal amount of sulfur as in step A followed by heat preservation for 2-3 h; and step C: placing a crude lithium sulfide product obtained after high-temperature firing into a sealed ball-milling tank, and performing ball-milling at room temperature at a rotation speed of 100-500 r/min for 12-24 h.