中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 2 February 2010 |
GUO Hua-jun(郭華軍), PENG Wen-jie(彭文杰), ZHANG Yun-he(張云河), HU Qi-yang(胡啟陽)
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: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.
Key words: lithium-ion batteries; lithium hexafluorophosphate; phosphorus pentafluoride; acetonitrile
