NaTFSI

CAS Number 91742-21-1

Battery Materials, Sodium-Ion Battery Materials

High purity NaTFSI > 99.9%

used as an electrolyte in sodium-ion batteries, supercapacitors and ionic liquids

Overview | Product Information | Related Products

NaTFSI (CAS number 91742-21-1) is a sodium salt containing the bis(trifluoromethanesulfonimide) (TFSI⁻) anion. NaTFSI is the sodium analog of LiTFSI, widely used as an electrolyte in sodium-ion batteries and supercapacitors. In solid-state batteries, NaTFSI provides mobile sodium ions and enhances ionic conductivity with the large and delocalized TFSI⁻ anions that reduce lattice friction. When combined with NaTFSI, a solid-state organic ionic plastic crystal (OIPC)-based electrolyte demonstrates a high ionic conductivity of 10⁻⁴ S/cm, more than three orders of magnitude higher than the conductivity of the pure OIPC.

NaTFSI is also used as a precursor for salt-in-presalt (SIPS) electrolytes. NaTFSI is converted to the presalt, N,N-dimethyltrifluoromethanesulfonamide, through methylation. The prepared 0.5 M NaTFSI in presalt electrolyte solution exhibits an electrochemical stability up to 6.7 V with a Coulombic efficiency of 99.7% at 2.0 mA/cm² and 4.0 mAh/cm² in Na‖Al cell configuration.

Sodium TFSI salt

promotes high ionic conductivity

Multiple applications

batteries, supercapacitors and ionic liquids

Worldwide shipping

Quick and reliable shipping

High Purity

> 99.9%

General Information

CAS Number	91742-21-1
Chemical Formula	C₂F₆NNaO₄S₂
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 or Family	Sodium batteries, Solid-state electrolytes, Electrolytes

Chemical Structure

Product Details

Purity	> 99.9%
Appearance	White powder/crystal

MSDS Documentation

NaTFSI MSDS Sheet

References

Fundamental understanding and quantification of capacity losses involving the negative electrode in sodium-ion batteries, L.-A. Ma et al., Adv. Sci., 11, 2306771 (2024); DOI: 10.1002/advs.202306771.
Ammonium-based plastic crystals as solid-state electrolytes for lithium and sodium batteries, M. Salado et al., JACS Au, 5, 1663–1676 (2025); DOI: 10.1021/jacsau.4c01086.
Investigating the role of mixed-cation ionic liquid electrolytes in sodium battery efficiency and stability, L. Huang et al., Mater. Adv., 5, 6899 (2024); DOI: 10.1039/d4ma00533c.

High capacity and high efficiency maple tree-biomass-derived hard carbon as an anode material for sodium-ion batteries, Y. Wang et al., Materials, 11, 1294 (2018); DOI: 10.3390/ma11081294.
A weakly coordinating-intervention strategy for modulating Na⁺ solvation sheathes and constructing robust interphase in sodium-metal batterie, C. Wang et al., Nat. Comm., 15, 6292 (2024); DOI: 10.1038/s41467-024-50751-w.
Salt-in-presalt electrolyte solutions for high-potential non-aqueous sodium metal, A.-M. Li et al, Nat. Nanotechnol., 20, 388–396 (2025); DOI: 10.1038/s41565-024-01848-2.

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