Dear Maksudul Hasan many thanks for your interesting technical question. Although I'm an inorganic chemist I had never heard about this phosphate salt before. According to the useful articles cited below it can be purchased as solution from Merck company.
On the use of LiPF3(CF2CF3)3 (LiFAP) solutions for Li-ion batteries. Electrochemical and thermal studies
Article On the use of LiPF3(CF2CF3)3 (LiFAP) solutions for Li-ion ba...
LiPF3(CF2CF3)(3): A salt for rechargeable lithium ion batteries
Article LiPF3(CF2CF3)(3): A salt for rechargeable lithium ion batteries
Both articles are freely available as public full texts on RG.
Also please see:
Perfluoroalkyl-Fluorophosphate Anions for High Voltage Electrolytes in Lithium Cells: DFT Study
Article Perfluoroalkyl-Fluorophosphate Anions for High Voltage Elect...