NaTFSI, or sodium bis(trifluoromethanesulfonyl)imide (CAS 91742-21-1), is a high-purity sodium salt of the TFSI− anion supplied by Ossila at >99.9% purity as a white powder or crystal. As the sodium counterpart of LiTFSI, it serves as an electrolyte salt for sodium-ion batteries, supercapacitors and ionic liquids.
In solid-state systems, NaTFSI supplies mobile sodium ions, while its large, delocalized TFSI− anions lower lattice friction and raise ionic conductivity. An organic ionic plastic crystal (OIPC) electrolyte combined with NaTFSI has reached an ionic conductivity of 10−4 S/cm, over three orders of magnitude above that of the pure OIPC.
NaTFSI can also act as the starting material for salt-in-presalt (SIPS) electrolytes, where methylation turns it into the presalt N,N-dimethyltrifluoromethanesulfonamide. A 0.5 M NaTFSI solution in this presalt showed electrochemical stability up to 6.7 V and a Coulombic efficiency of 99.7% at 2.0 mA/cm2 and 4.0 mAh/cm2 in a Na‖Al cell.
- Electrolyte salt for sodium-ion battery research.
- Sodium ion source for solid-state electrolytes such as organic ionic plastic crystals.
- Electrolyte component for supercapacitors.
- Preparation of ionic liquid electrolytes.
- Precursor for salt-in-presalt (SIPS) electrolytes for high-potential sodium metal cells.
| Brand | Ossila |
|---|---|
| CAS number | 91742-21-1 |
| Molecular formula | C2F6NNaO4S2 |
| Purity | > 99.9% |
| Category | — |
| Pack sizes | 5 g, 10 g, 25 g, 50 g |
| Physical form | White powder/crystal |
| Storage | — |
- Product code: M2553A1
- Full Name: Sodium bis(trifluoromethanesulfonyl)imide
- Molecular Weight: 303.13 g/mol
- Melting Point: 257 °C
- Synonyms: Sodium trifluoromethanesulfonimide, NaNTf2, Sodium triflimide, Sodium bistriflimide
- Classification: Sodium batteries, Solid-state electrolytes, Electrolytes
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