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LiTFSI /Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is a white crystalline powder, highly hygroscopic, with formula LiN(SO₂CF₃)₂. It is freely soluble in water, alcohols, and polar aprotic solvents (carbonates, ethers, nitriles), insoluble in nonpolar hydrocarbons. It exhibits high thermal stability (decomposition >370°C), excellent electrochemical stability, and high ionic conductivity in electrolytes. It is stable under neutral/acidic conditions but decomposes in strong base.
| Item | Specification |
| Melting Point | 234–238 °C (lit.) |
| Boiling Point | N/A |
| Density | 1.334 g/cm³ |
| Flash point | >100 °C (>212 °F) |
| Solubility | 10 mg/mL, clear, colorless （in H₂O） |
LiTFSI is used as a high-performance lithium salt in Li-ion battery electrolytes (liquid, gel, solid-state)
Serves as an electrolyte additive to enhance thermal stability and cycle life
Applied in supercapacitors and aluminum electrolytic capacitors for high-conductivity electrolytes
Lithium bis(trifluoromethanesulphonyl)imide is used as a Lewis acid catalyst in organic synthesis and ionic liquid preparation
Employed in solid polymer electrolytes for flexible and solid-state batteries
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