|__ Li + __ H -|
white odorless solid
|External identifiers / databases|
|Molar mass||7.95 g mol −1|
0.78 g cm −3
688 ° C
reacts violently with water
Switzerland: 0.025 mg m −3 (measured as inhalable dust )
|As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .|
Lithium hydride LiH is a salt-like chemical compound of lithium and hydrogen . Since lithium hydride is very stable, in connection with the low molar mass of lithium it represents an excellent hydrogen storage device with a capacity of 2.8 m³ hydrogen per kilogram. The hydrogen can be released by reacting with water.
Extraction and presentation
Lithium hydride is a white to gray, flammable powder which, with a density of 0.76 g / cm³, is one of the lightest non- porous solids. It melts at 688 ° C. The enthalpy of formation is −90.43 kJ / mol.
Lithium hydride begins to decompose at 900–1000 ° C into elemental lithium and hydrogen , making it the most thermally stable alkali metal hydride.
Lithium hydride is used as a reducing agent for the production of hydrides and double hydrides . It is also used to deprotonate CH-acidic compounds. Another area of application is the production of the hydrogenating agents lithium boranate and lithium alanate .
In Lithiumdeuterid (LiD) is deuterated lithium hydride, d. That is, the hydrogen isotope deuterium was used instead of normal hydrogen. Lithium deuteride is one of the core components of the solid hydrogen bomb , which has greatly simplified the storage and handling of the otherwise gaseous deuterium and the generation of the tritium required for fusion .
Since lithium hydride reacts strongly exothermic with common fire extinguishing agents like water , carbon dioxide , nitrogen or carbon tetrachloride , fires with inert gases like z. B. argon can be deleted.
- Swiss Accident Insurance Fund (Suva): Limit values - current MAK and BAT values (search for 7580-67-8 or lithium hydride ), accessed on November 2, 2015.
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