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Lithium sulfide (Li2S) is lithium sulfide, molecular weight: 45.95. White to yellow crystal, with inverse fluorite structure, specific gravity 1.66 (water = 1), melting point 938°C, boiling point 1372°C. Lithium sulfide is easily soluble in water, soluble in ethanol, soluble in acid, and insoluble in alkali. It absorbs moisture in the air and hydrolyzes, releasing hydrogen sulfide gas. Easily soluble in water and soluble in ethanol. Lithium sulfide is one of the commonly used cathode materials in lithium-ion batteries. It is also used in some chemical synthesis reactions, such as as a reducing agent in organic synthesis. In addition, lithium sulfide can also be used to prepare other lithium compounds and as a component of catalysts or electrolytes. Lithium sulfide can be prepared by a variety of methods, some of the common methods include the following: 1. Direct reaction method: This is one of the most common methods for preparing lithium sulfide. It involves the direct reaction of pure lithium metal with sulfur to produce lithium sulfide. The reaction is usually carried out at high temperature to promote the reaction. The chemical equation for the reaction is as follows: 2Li+S→Li2S 2. Reaction method of sulfur and carbon: This method involves reacting sulfur with carbon-containing compounds (such as coal, coke or charcoal) to produce hydrogen sulfide and lithium sulfide, and then hydrogen sulfide reacts with lithium to produce lithium sulfide. This method is generally used in industrial production. 2LiOH+2H2S→2LiHS+2H2O LiHS+LiOH→Li2S+H2O 3. Lithium hydrosulfide hydrolysis method: Lithium hydrosulfide (LiHS) can react with water to generate lithium sulfide: LiHS+H2O→Li2S+H2S 4. Chemical vapor deposition method: This method involves the decomposition of lithium and sulfur compounds (such as lithium ethylenediamine sulfate) at appropriate temperatures and pressures, and then generates lithium sulfide. Li2SO4+4NH2CH2CH2NH2→Li2S+4NH3+4NH4HSO4
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