Application of thermogravimetric studies for optimization of lithium hexafluorophosphate production

Lithium hexafluorophosphate, isolated from hydrogen fluoride solution (anhydrous) by decanting and filtering, is an adduct of composition LiPF6*HF. By thermogravimetric investigations the dynamics of HF removal from LiPF6 by LiPF6*HF thermal decomposition was studied. Based on the experimental data the constants entering into the equations as C = C0*exp(t*K0* exp(− E/RT)) were calculated, explaining the thermal decomposition processes of LiPF6*HF and LiPF6.