Lithium sulfide

Lithium sulfide is the inorganic compound with the formula Li₂S. It crystallizes in the antifluorite motif, described as the salt (Li⁺)₂S²⁻. It forms a solid yellow-white deliquescent powder. In air, it easily hydrolyses to release foul smelling hydrogen sulfide gas.^[2]

Lithium sulfide

__ Li+     __ S2−
Names
IUPAC name Lithium hydrosulfide
Preferred IUPAC name Lithium sulfide
Identifiers
CAS Number	12136-58-2 Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	8466196 Y
ECHA InfoCard	100.032.013
EC Number	235-228-1
PubChem CID	10290727
RTECS number	OJ6439500
UNII	SW6C51V9JZ Y
CompTox Dashboard (EPA)	DTXSID7065251
InChI InChI=1S/2Li.S/q2*+1;-2 Y Key: GLNWILHOFOBOFD-UHFFFAOYSA-N Y InChI=1S/2Li.S/q2*+1;-2 Key: GLNWILHOFOBOFD-UHFFFAOYSA-N
SMILES [Li+].[Li+].[S-2] [Li+].[Li+].[S-2]
Properties
Chemical formula	Li2S
Molar mass	45.95 g/mol
Appearance	white solid
Density	1.67 g/cm3
Melting point	938 °C (1,720 °F; 1,211 K)
Boiling point	1,372 °C (2,502 °F; 1,645 K)
Solubility in water	decomposes to LiOH and H2S
Solubility	very soluble in ethanol
Structure
Crystal structure	Antifluorite (cubic), cF12
Space group	Fm3m, No. 225
Coordination geometry	Tetrahedral (Li+); cubic (S2−)
Thermochemistry
Std molar entropy (S⦵298)	63 J/mol K
Std enthalpy of formation (ΔfH⦵298)	−9.401 kJ/g or −447 kJ/mol
Hazards
NFPA 704 (fire diamond)	3 1 1
Lethal dose or concentration (LD, LC):
LD50 (median dose)	240 mg/kg (oral, rat)[1]
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Lithium oxide Lithium selenide Lithium telluride Lithium polonide
Other cations	Sodium sulfide Potassium sulfide Rubidium sulfide Caesium sulfide
Related compounds	Lithium hydrosulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Preparation

Lithium sulfide is prepared by treating lithium with sulfur. This reaction is conveniently conducted in anhydrous ammonia.^[3]

2 Li + S → Li₂S

The THF-soluble triethylborane adduct of lithium sulfide can be generated using superhydride.^[4]

Reactions and applications

Lithium sulfide has been considered for use in lithium–sulfur batteries.^[5]