Lithium hexafluorophosphate

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Lithium hexafluorophosphate
Lithium hexafluorophosphate.png
Names
IUPAC name
lithium hexafluorophosphate
Identifiers
21324-40-3 YesY
ChemSpider 146939 YesY
Jmol-3D images Image
PubChem 23688915
Properties
LiPF6
Molar mass 151.905 g/mol
Appearance white powder
Density 1.5 g/cm3
Melting point 200 °C (392 °F; 473 K)
soluble
Hazards
Safety data sheet External MSDS
GHS pictograms The corrosion pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word DANGER
H314
P280, P310, P305+351+338
EU Index Not listed
R-phrases R22, R24, R34
S-phrases S26, S36, S37, S39, S45
Flash point Non-flammable
Related compounds
Other anions
Lithium tetrafluoroborate
Other cations
Sodium hexafluorophosphate
Potassium hexafluorophosphate
Ammonium hexafluorophosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 YesY verify (what isYesY/N?)
Infobox references

Lithium hexafluorophosphate is an inorganic compound with the formula LiPF6. It is a white crystalline powder. It is used in commercial secondary batteries, an application that exploits its high solubility in nonpolar solvents. Specifically, solutions of lithium hexafluorophosphate in propylene carbonate and dimethoxyethane serve as an electrolyte in lithium batteries.[1] This application also exploits the inertness of the hexafluorophosphate anion toward strong reducing agents, such as lithium metal.

The salt is relatively stable thermally, but loses 50% weight at 200 °C. In nonaqueous solutions hydrolysis is noticeable near 70 °C[2] according to the following equation:

LiPF6 + H2O → HF + PF5 + LiOH

LiPF6 also catalyses the tetrahydropyranylation of tertiary alcohols.[3]

References[edit]

  1. ^ John B. Goodenough, Youngsik Kim "Challenges for Rechargeable Li Batteries" Chem. Mater., 2010, volume 22, pp 587–603. doi:10.1021/cm901452z
  2. ^ "Xu, Kang. "Nonaqueous Liquid Electrolytes for Lithium-Based Rechargeable Batteries."Chemical Reviews 2004, pp. 104, pp. 4303-418. <http://pubs.acs.org/doi/pdf/10.1021/cr030203g>"
  3. ^ Nao Hamada; Sato Tsuneo (2004). "Lithium Hexafluorophosphate-Catalyzed Efficient Tetrahydropyranylation of Tertiary Alcohols under Mild Reaction Conditions". Synlett (10): 1802. doi:10.1055/s-2004-829550.