The Properties And Preparation of Lithium Sulfide Powder
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Update time : 2021-03-18 09:40:35
Lithium sulfide is a white to yellow crystal. It is easy to absorb moisture in the air and is easy to be oxidized. It needs to be stored in an inert atmosphere.
The Properties of Lithium Sulfide:
The molecular formula of lithium sulfide: Li2S, which is a sulfide of lithium, the molecular weight of lithium sulfide is 45.95. It is a white to yellow crystal with an inverse fluorite structure. Lithium sulfide has a melting point of 938°C and a boiling point of 1372°C.
Lithium sulfide is easily soluble in water, soluble in ethanol, soluble in acid, and insoluble in alkali. Lithium sulfide can be used as a potential electrolyte material in rechargeable lithium-ion batteries.
Lithium sulfide easily absorbs water vapor in the air and dissolves, releasing highly toxic hydrogen sulfide gas. Lithium sulfide can be separated by acid to liberate hydrogen sulfide; it can react violently with nitric acid, but hydrobromic acid and hydroiodic acid can only decompose it when heated. Lithium sulfide reacts slowly with concentrated sulfuric acid, but reacts violently with dilute sulfuric acid. Lithium sulfide is oxidized by oxygen when heated to about 300°C in air, but does not produce sulfur dioxide, but produces lithium sulfate.
The Preparation of Lithium Sulfide:
Lithium sulfide can be prepared by a variety of methods.
In the past, lithium and sulfur were used to heat together to react, and carbon or hydrogen was used to reduce lithium sulfate under heating to prepare lithium sulfide.
Later, it was discovered that lithium and sulfur can act in liquid ammonia, or lithium ethoxide can decompose the ethanol adduct of lithium hydrosulfide to produce lithium sulfide.
Afterwards, some people used lithium pentoxide and hydrogen sulfide to react first to prepare lithium hydrogen sulfide, and then make lithium hydrogen sulfide decomposed by heating in a vacuum to prepare lithium sulfide.
High-quality anhydrous lithium sulfide can be produced by reacting metallic lithium with hydrogen sulfide in tetrahydrofuran.
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