Lithium bis(trifluoromethanesulfonyl)imide

Lithium bis(trifluoromethanesulfonyl)imide, often simply referred to as LiTFSI, is a hydrophilic salt with the chemical formula LiC2F6NO4S2. It is commonly used as Li-ion source in electrolytes for Li-ion batteries as a safer alternative to commonly used lithium hexafluorophosphate. It is made up of one Li cation and a bistriflimide anion.

Lithium bis(trifluoromethane­sulfonyl)imide
Names
IUPAC name
Lithium bis(trifluoromethylsulfonyl)azanide
Other names
LiTFSI
Identifiers
3D model (JSmol)
ECHA InfoCard 100.101.430
RTECS number
  • XR2775000
UNII
  • InChI=1S/C2F6NO4S2.Li/c3-1(4,5)14(10,11)9-15(12,13)2(6,7)8;/q-1;+1
    Key: QSZMZKBZAYQGRS-UHFFFAOYSA-N
  • [Li+].C(F)(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F
Properties
LiC
2F
6NO
4S
2
Molar mass 287.075 g/mol
Appearance White solid
Odor odorless
Density 1.33 g/cm3
Melting point 236 °C (457 °F; 509 K)
80.65% (22 °C)
Hazards
Safety data sheet (SDS)
Related compounds
Other anions
 Bistriflimide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Because of its very high solubility in water (> 21 m), LiTFSI has been used as lithium salt in water-in-salt electrolytes for aqueous lithium-ion batteries.

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