Lithium hexafluorophosphate (LiPF6) is an inorganic compound, a white crystalline or powdery substance, readily soluble in water and also soluble in low-concentration methanol, ethanol, acetone, carbonates, and other organic solvents. It is the most important component of electrolytes, accounting for approximately 43% of the total electrolyte cost. In the fluorochemical industry, although the year-on-year decline in traditional products is significant, demand for high-end products has maintained strong growth. In particular, the production and sales of lithium hexafluorophosphate continue to maintain a good momentum, and with the continued expansion of the new energy sector in the future, lithium hexafluorophosphate is expected to experience sustained explosive growth.
Properties and stability of lithium hexafluorophosphate
It will not decompose if used and stored according to specifications. Avoid contact with oxidants. It is readily soluble in water and also soluble in low concentrations of organic solvents such as methanol, ethanol, propanol, and carbonates. It decomposes upon exposure to air or heating.
Synthesis method of lithium hexafluorophosphate
1. Wet process: This method involves dissolving lithium salt in anhydrous hydrofluoric acid to form a LiF·HF solution, then introducing PF5 gas to react and produce lithium hexafluorophosphate crystals. The product is then obtained after separation and drying.
2. Dry method: This method involves treating LiF with anhydrous HF to form porous LiF, and then introducing PF5 gas to carry out the reaction, thereby obtaining the product.
3. Solvent method: This method involves reacting lithium salts with alkali metal salts, ammonium salts, or organic amine salts of fluorophosphate in an organic solvent to crystallize and thus produce lithium hexafluorophosphate.
Applications of lithium hexafluorophosphate
Lithium hexafluorophosphate, as an electrolyte for lithium-ion batteries, is mainly used in lithium-ion power batteries, lithium-ion energy storage batteries and other daily-use batteries. It is also an irreplaceable lithium-ion battery electrolyte in the near to medium term.
