Lithium peroxide

Lithium peroxide
	__ Li+ __ O−
Names
	IUPAC name Lithium peroxide
	Other names Dilithium peroxide; Lithium(I) peroxide
Identifiers
CAS Number	12031-80-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	23787 ;
ECHA InfoCard	100.031.585
PubChem CID	25489;
UNII	9ANX556R5F ;
CompTox Dashboard (EPA)	DTXSID7065178 ;
	InChI InChI=1S/2Li.O2/c;;1-2/q2+1;-2 Key: HPGPEWYJWRWDTP-UHFFFAOYSA-N ; InChI=1/2Li.O2/c;;1-2/q2+1;-2 Key: HPGPEWYJWRWDTP-UHFFFAOYAV;
	SMILES [Li+].[Li+].[O-][O-];
Properties
Chemical formula	Li2O2
Molar mass	45.885 g/mol
Appearance	fine, white powder
Odor	odorless
Density	2.32 g/cm3
Melting point	Decomposes to Li2O at ~450°C but melts at 197°C
Boiling point	NA
Solubility in water	soluble
Structure
Crystal structure	hexagonal
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−13.83 kJ/g
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H272, H314
Precautionary statements	P210, P220, P221, P260, P264, P280, P283, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P306+P360, P310, P321, P363, P370+P378, P371+P380+P375, P405, P501
NFPA 704 (fire diamond)	3 0 2 OX
Related compounds
Other cations	Sodium peroxide; Potassium peroxide; Rubidium peroxide; Caesium peroxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Lithium peroxide is the inorganic compound with the formula Li₂ O₂. Lithium peroxide is a white solid, and unlike most other alkali metal peroxides, it is nonhygroscopic. Because of its high oxygen:mass and oxygen:volume ratios, the solid has been used to remove CO₂ from and release O₂ to the atmosphere in spacecraft.

Names

__ Li⁺ __ O⁻
IUPAC name Lithium peroxide
Other names Dilithium peroxide Lithium(I) peroxide
Identifiers
CAS Number	12031-80-0^Y
3D model (JSmol)	Interactive image
ChemSpider	23787^Y
ECHA InfoCard	100.031.585
PubChem CID	25489
UNII	9ANX556R5F^Y
CompTox Dashboard (EPA)	DTXSID7065178
InChI InChI=1S/2Li.O2/c;;1-2/q2+1;-2^Y Key: HPGPEWYJWRWDTP-UHFFFAOYSA-N^Y InChI=1/2Li.O2/c;;1-2/q2+1;-2 Key: HPGPEWYJWRWDTP-UHFFFAOYAV
SMILES [Li+].[Li+].[O-][O-]
Properties
Chemical formula	Li₂O₂
Molar mass	45.885 g/mol
Appearance	fine, white powder
Odor	odorless
Density	2.32 g/cm³
Melting point	Decomposes to Li₂O at ~450°C but melts at 197°C
Boiling point	NA
Solubility in water	soluble
Structure
Crystal structure	hexagonal
Thermochemistry
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−13.83 kJ/g
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H272, H314
Precautionary statements	P210, P220, P221, P260, P264, P280, P283, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P306+P360, P310, P321, P363, P370+P378, P371+P380+P375, P405, P501
NFPA 704 (fire diamond)	3 0 2 OX
Related compounds
Other cations	Sodium peroxide Potassium peroxide Rubidium peroxide Caesium peroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references