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 easy for it to absorb moisture from the atmosphere and to oxidize. 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. The molecular weight is 45.95. The crystal is white to yellow with an inverse structure of 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 the highly toxic gas of 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 when it is diluted. 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 old days, sulfur and lithium were heated together and then carbon or hydrogen is used to reduce the lithium sulfate while heating. This produces lithium sulfide.

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

Some people have used a reaction between lithium pentoxide, hydrogen sulfide (to prepare lithium hydrogen-sulfide), and heated lithium hydrogen-sulfide under vacuum to create lithium sulfide.

Anhydrous lithium sulfide of high quality can be made by reacting metallic Lithium with Hydrogen Sulfide in Tetrahydrofuran.

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