Lithium hexafluorophosphate is an inorganic compound with the formula LiPF6.

LiPF6 is manufactured by reacting phosphorus pentachloride with hydrogen fluoride and lithium fluoride[1] [2] Suppliers include Targray and Morita Chemical Industries Co., Ltd.

It hydrolyzes near 70 °C (158 °F)[3] according to the following equation forming highly toxic HF gas: Owing to the Lewis acidity of the Li+ ions, LiPF6 also catalyses the tetrahydropyranylation of tertiary alcohols.

[4] In lithium-ion batteries, LiPF6 reacts with Li2CO3, which may be catalysed by small amounts of HF:[5] The main use of LiPF6 is in commercial secondary batteries, an application that exploits its high solubility in polar aprotic solvents.

[6][7][8] This application takes advantage of the inertness of the hexafluorophosphate anion toward strong reducing agents, such as lithium metal, as well as of the ability of [PF6-] to passivate the positive aluminium current collector.