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6649119 
Journal Article 
Preparation and Characterization of Phosphorus Pentafluoride Gas for Lithium Ion Battery Electrolyte Salt 
Liu Jian-wen; Li Xin-hai; Wang Zhi-xing; Guo Hua-jun; Hu Qi-yang; , 
2009 
Yes 
Chemical Research in Chinese Universities
ISSN: 1005-9040 
HIGHER EDUCATION PRESS 
BEIJING 
791-795 
WOS:000272832000003 
A novel preparation method of phosphorus pentafluoride(PF5) is introduced in details in the article. Phosphorus pentafluoride is mainly used to synthesize lithium ion battery electrolyte salt. In the experiment mesne-product-hexafluorophosphoric acid(HPF6) was firstly prepared from phosphorus pentoxide(P2O5) and anhydrous hydrogen fluoride(HF). according to the chemical stoichiometrics, the optimum amount of excess HF used was about 60% and the optimum reaction time was 4 h; then HPF6 was dehydrated by oleum with an excess amount of 35%-40% which was heated for 40-50 min at 150 degrees C; thus HPF6 was decomposed to a mixture of gases containing PF5; impurity gases were removed through condensation in the presence of cooling water at 0 degrees C, then PF5 of high purity was eventually prepared. The production was characterized by infrared(IR) spectrometry and gas chromatography-mass spectroscopy-selected ion monitoring(GC-MS-SIM). Eventual results indicate that PF5 prepared by the novel method has a high target purity and a low amount of impurity and water.