NH4PF6

Ammonium hexafluorophosphate, with the chemical formula NH4PF6, is an inorganic salt. It is the ammonium salt of hexafluorophosphoric acid. The compound appears as a white crystalline solid. It is soluble in water and also in some polar organic solvents. NH4PF6 can be synthesized through the reaction of ammonium fluoride with phosphorus pentafluoride, or by reacting ammonium chloride with a solution of potassium hexafluorophosphate.

This salt has found applications in various fields. In electrochemistry, it is used as an electrolyte salt in batteries, particularly in lithium-ion batteries, due to its good ionic conductivity and electrochemical stability. It is also employed in the synthesis of other hexafluorophosphate compounds. In some analytical chemistry procedures, it may be used as a reagent. Due to the presence of fluoride ions, it is important to handle NH4PF6 with care, avoiding contact with skin and eyes, and ensuring adequate ventilation as it can release toxic fumes when heated or in contact with acids.