METHOD FOR PREPARING LITHIUM SULFIDE BY USING METALLIC LITHIUM

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.