The Properties And Preparation of Lithium Sulfide Powder

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Lithium Sulfide This crystal ranges in color from white to golden. It is easily oxidized and can absorb moisture from the atmosphere. It should be stored in a dry atmosphere.

Lithium Sulfide Properties:

The molecular formula for lithium is Li2S. This is a sulfide form of lithium. Its molecular weight is 45.95. The crystal is white to yellow with inverse fluorite. The melting and boiling points of lithium sulfide are 938degC & 1372degC respectively.
Lithium sulfide dissolves easily in water, is soluble when mixed with ethanol, but insoluble when mixed with alkali. Lithium Sulfide could be used in lithium-ion rechargeable batteries as an electrolyte.

Lithium Sulfide absorbs air vapor and dissolves it, releasing highly poisonous hydrogen sulfide. Hydrogen sulfide is released when lithium sulfide is separated with acid. Lithium can also react violently to nitric and hydrobromic acids, but only after heating. Lithium reacts slowly with concentrated acid sulfuric, but violently with diluted sulfuric acid. When heated to 300degC or more in the air, lithium sulfide oxidizes by oxygen, but it does not produce sulfur dioxide. Instead, it produces lithium sulfate.

Lithium Sulfide Preparation:

You can prepare Lithium Sulfide in a number of ways.
In the past, carbon or hydrogen were used to reduce lithium-sulfate by heating, resulting in lithium-sulfide.

The ethanol adduct from lithium hydrosulfide can be decomposed by lithium ethoxide to produce lithium sulfur.

Some people have used lithium pentoxide with hydrogen sulfide as a reaction to create lithium hydrogensulfide. Then, they heated it in a vacuum and decomposed the lithium hydrogensulfide into lithium sulfide.

Anhydrous lithium sulfide of high quality can be made by reacting metallic Li with hydrogen sulfide and tetrahydrofuran.

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