
Lithium fluoride is an inorganic fluoride with the chemical formula LiF and a molecular weight of 25.94. It forms white crystals in the cubic crystal system (NaCl-type structure) and appears as a white powder or fine granules at room temperature. It has a high melting point and is highly chemically stable; it is slightly soluble in water, insoluble in organic solvents, and soluble in hydrofluoric acid to form lithium hydrofluoride. Its core applications include raw materials for lithium-ion battery electrolytes, optical materials, molten salt carriers in the nuclear industry, and metallurgical additives, making it a key foundational material for new energy and high-end manufacturing.
| Item | Specification |
| Melting point | 845–848°C |
| Boiling Point | 1681°C |
| Density | 2.64 g/mL at 25°C |
| Vapor pressure | <0.001 mmHg at 25°C |
| Refractive index | 1.3915 |
| Solubility in water | 0.13–0.134 g/100 mL (25°C). |
| Lattice constant | a = 4.026 Å (cubic crystal system) |
| Thermal stability | Extremely high; evaporates slowly above 1100°C without decomposition |
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