|Synonyms||lithium difluorophosphate (LiPO2F2 |LiDFP)|
Lithium Difluorophosphate (LiPO2F2)
Phosphorodifluoridic acid, lithium salt
In recent years, due to the rapid development of smart devices such as mobile phones and tablet computers, the market share of small lithium batteries has grown rapidly. In addition, the technology of electric vehicles has become increasingly perfect, and the market demand for large lithium batteries has gradually been released. It is expected that in the next few years, lithium batteries will Maintain the growth trend. Most lithium batteries are secondary batteries. Their poor stability, poor low temperature resistance, and poor cycle characteristics are the main technical difficulties for their rapid development. Research has proved that lithium difluorophosphate as an electrolyte can effectively improve the above-mentioned lithium battery shortcomings.
in the closed non-pound steel reaction dad, P2O5, LiF and dry tetrachlorofuran are respectively added to the reaction dad at normal temperature, sealed and stirred, cooled to -40 c, replaced the atmosphere in the kettle with nitrogen, argon or helium with water content less than 1ppm for three times, after the moisture content in the kettle is less than 1ppm, the temperature is increased to 100 c, the pressure is increased to 0.8MPa, when the reaction is 5 under stirring, the reaction temperature is 100°C and the reaction pressure is 0.8MPa; The molar ratio of P0F3 to P2O5 and LiF is 1:1.2:1.7; Then the temperature of the reaction kettle is reduced to room temperature, the insoluble matter is removed by filtration after pressure relief to obtain a pale yellow transparent filtrate, the solvent is removed by distillation under reduced pressure, and the remaining solid is recrystallized with freshly dried acet, after vacuum drying at 40°C, LiPO2F2 white powder solid with moisture ≤ 10ppm, chromaticity ≤ 20, LiF%≤ 0.02%, and purity 99.7% was obtained.