Lithium hexafluorostannate(IV) is an inorganic salt with the chemical formula Li₂SnF₆. It is a white crystalline solid that is sensitive to moisture and typically handled under inert conditions. This compound is a source of both lithium ions and the hexafluorostannate anion. The primary application of lithium hexafluorostannate is in the field of energy storage, specifically as a precursor or additive for advanced battery electrolytes. Research explores its use in lithium-ion and lithium-metal batteries, where it can function as a component of solid-state electrolytes or as an additive in liquid electrolytes to improve ionic conductivity and enhance the stability of the solid electrolyte interphase (SEI) on the anode. It is also investigated as a potential material for fluoride-ion batteries. As an inorganic metal salt, it serves as a specialized reagent in synthetic chemistry, particularly in reactions requiring a source of SnF₆²⁻ anions or for the preparation of other fluorometallate compounds. Due to its moisture sensitivity and the potential generation of hazardous hydrogen fluoride upon decomposition, appropriate safety precautions are essential during handling and storage.