High-purity LiPF6 chemical is a white crystal or powder with a relative molecular mass of 151.91, a relative density of 1.50, and a melting point of 200℃. From its crystal structure, it can be seen that every 6 F atoms form a hexacoordinated octahedron around 1 P atom, and the octahedron and lithium ions are in different layers. LiPF6 is highly deliquescent and reacts with trace amounts of water in the air to produce HF, etc. It is easily soluble in water, ether, low-concentration methanol, carbonates and other organic solvents.

The thermal stability of LiPF6 is worse than that of other lithium salts. It can be decomposed into LiF and PF5 in small amounts at 60℃, and begins to decompose in large quantities when heated to about 180℃. It begins to decompose at 160℃ in dry N2. The thermal decomposition temperature of LiPF6 in the electrolyte is higher than that of solid LiPF6.

The lithium salts currently used as electrolytes for lithium-ion batteries are mainly divided into inorganic lithium salts and organic lithium salts. Inorganic lithium salts are the most widely used electrolytes. LiPF6 has the best overall comprehensive performance, with the advantages of being environmentally friendly, passivating the positive electrode current collector to prevent electrode corrosion, facilitating the formation of SEI film on the negative electrode, and having a wide electrochemical stability window. Therefore, LiPF6 powder is the most valuable electrolyte lithium salt at this stage and in the foreseeable future.