Pure lithium hexafluorophosphate (LiPF6) was successfully prepared at room temperature (23 °C) by introducing fluorine gas into a reactor containing LiF and P at −196 °C. The mass fractions of LiPF6 and LiF in products prepared at 23 °C were 1.00 and 0.00, respectively, by means of XRD-Rietveld analysis. Namely, the prepared LiPF6 was pure enough to be used as an electrolyte salt in lithium ion batteries.
LiPF6 is fabricated by mixing equimolar amounts of red phosphorus with LiF followed by adding a twofold amount of condensed ClF3 gas (Ni reactor, ‐196 → ‐20 to +100 °C, 1 or 5 h).
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