摘要
A promising preparation method for lithium hexafluorophosphate(LiPF6)was introduced.Phosphorus pentafluoride(PF5) was first prepared using CaF2 and P2O5 at 280℃for 3 h.LiPF6 was synthesized in acetonitrile solvent by LiF and PF5 at room temperature(20-30℃)for 4 h.The synthesized LiPF6 was characterized by infrared spectrometry and X-ray diffraction(XRD). Atomic absorption and ion chromatography results show that the purity of synthesized LiPF6 reaches 99.98%.Thermal stability of self-synthesized LiPF6 was analyzed by differential thermal analysis and thermogravimetry.The results indicate that the self-synthesized LiPF6 has higher purity,lower impurity contents and better thermal stability than the commercial LiPF6.
A promising preparation method for lithium hexafluorophosphate （LiPF6） was introduced. Phosphorus pentafluoride （PF5） was first prepared using CaF2 and P2O5 at 280℃ for 3 h. LiPF6 was synthesized in acetonitrile solvent by LiF and PF5 at room temperature （20-30 ℃） for 4 h. The synthesized LiPF6 was characterized by infrared spectrometry and X-ray diffraction（XRD）. Atomic absorption and ion chromatography results show that the purity of synthesized LiPF6 reaches 99.98%. Thermal stability of self-synthesized LiPF6 was analyzed by differential thermal analysis and thermogravimetry. The results indicate that the self-synthesized LiPF6 has higher purity, lower impurity contents and better thermal stability than the commercial LiPF6.
基金
Project(2007CB613607)supported by the National Basic Research Program of China
