Lithium bis(trifluoromethanesulfonyl)imide

Lithium bis(trifluoromethanesulfonyl)imide, often simply referred to as LiTFSI, is a hydrophilic salt with the chemical formula LiC₂F₆NO₄S₂.[1] It is commonly used as Li-ion source in electrolytes for Li-ion batteries as a safer alternative to commonly used lithium hexafluorophosphate.[2] 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
CAS Number	90076-65-6
3D model (JSmol)	Interactive image
PubChem CID	164811733
RTECS number	XR2775000
UNII	9Y730392A5
InChI 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
SMILES [Li+].C(F)(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F
Properties
Chemical formula	LiC 2F 6NO 4S 2
Molar mass	287.075 g/mol
Appearance	White solid
Odor	odorless
Density	1.33 g/cm^3
Melting point	236 °C (457 °F; 509 K)
Solubility in water	soluble in water
Hazards
Safety data sheet
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.[3][4]

References

1. Pubchem. "90076-65-6 | C2F6LiNO4S2 - PubChem". pubchem.ncbi.nlm.nih.gov. Retrieved 2017-03-11.
2. Kalhoff, Julian; Bresser, Dominic; Bolloli, Marco; Alloin, Fannie; Sanchez, Jean-Yves; Passerini, Stefano (2014-10-01). "Enabling LiTFSI-based Electrolytes for Safer Lithium-Ion Batteries by Using Linear Fluorinated Carbonates as (Co)Solvent". ChemSusChem. 7 (10): 2939–2946. doi:10.1002/cssc.201402502. ISSN 1864-564X. PMID 25138922.
3. Suo, Liumin; Borodin, Oleg; Gao, Tao; Olguin, Marco; Ho, Janet; Fan, Xiulin; Luo, Chao; Wang, Chunsheng; Xu, Kang (2015-11-20). ""Water-in-salt" electrolyte enables high-voltage aqueous lithium-ion chemistries". Science. 350 (6263): 938–943. doi:10.1126/science.aab1595. ISSN 0036-8075. PMID 26586759.
4. Smith, Leland; Dunn, Bruce (2015-11-20). "Opening the window for aqueous electrolytes". Science. 350 (6263): 918. doi:10.1126/science.aad5575. ISSN 0036-8075. PMID 26586752.