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 non aqueous, polar solvents. Specifically, solutions of lithium hexafluorophosphate in carbonate blends of ethylene carbonate, dimethyl carbonate, diethyl carbonate and/or ethyl methyl carbonate, with a small amount of one or many additives like vinylene carbonate, serve as state-of-the-art electrolytes in lithium-ion batteries.  This application also exploits the inertness of the hexafluorophosphate anion toward strong reducing agents, such as lithium metal.
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||151.905 g/mol|
|Melting point||200 °C (392 °F; 473 K)|
|Safety data sheet||External MSDS|
|GHS signal word||DANGER|
|P280, P310, P305+351+338|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
The salt is relatively stable thermally, but loses 50% weight at 200 °C (392 °F). It hydrolyzes near 70 °C (158 °F) according to the following equation:
- LiPF6 + H2O → HF + PF5 + LiOH
- LiPF6 + Li2CO3 → POF3 + CO2 + 3 LiF
A recent research also proposed, based on nuclear magnetic resonance results and density functional theory calculations, that LiPF6 could react in a mixture of ethylene carbonate and dimethyl carbonate with alumina powder or alumina coated lithium-ion batteries cathode materials to form lithium difluorophosphate and alumina oxyfluoride via the reaction: 
- 2 Al2O3 (s) + x LiPF6 (solv) → 2 Al2O3-xF2x (s) + x LiPO2F2 (solv)
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