Abstract
A promising preparation method for lithium hexafluorophosphate (LiPF 6) was introduced. Phosphorus pentafluoride (PF 5) was first prepared using CaF 2 and P 2O 5 at 280°C for 3 h. LiPF 6 was synthesized in acetonitrile solvent by LiF and PF 5 at room temperature (20−30) for 4 h°C. The synthesized LiPF 6 was characterized by infrared spectrometry and X-ray diffraction(XRD). Atomic absorption and ion chromatography results show that the purity of synthesized LiPF 6 reaches 99.98%. Thermal stability of self-synthesized LiPF 6 was analyzed by differential thermal analysis and thermogravimetry. The results indicate that the self-synthesized LiPF 6 has higher purity, lower impurity contents and better thermal stability than the commercial LiPF 6.
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