Lithium Tetrakis(pentafluorophenyl)borate Ethyl EtherateCAS #: 371162-53-7

Synonyms 

Lithium tetrakis(pentafluorophenyl)borate(1-) ethoxyethane (1:1:1); Tetrakis(pentafluorophenyl)boron lithium ethyl etherate

Compound Formula: C28H10BF20LiO 

Molecular Weight: 871-C.28 760.098 

Appearance: Beige powder 

Melting Point: 117-122 °C 

Boiling Point: N/A 

Density: N/A 

Solubility in H2O: N/A

Exact Mass: 760.066539 

Monoisotopic Mass: 760.066539

Product Introduction: Sodium Bis(fluorosulfonyl)imide (NaFSI, CAS #: 371162-53-7)

Sodium bis(fluorosulfonyl)imide, with the chemical formula NaN(SO₂F)₂ and CAS number 371162-53-7, is an advanced sodium salt gaining traction as a high-performance electrolyte material in next-generation sodium-ion batteries (SIBs) and other electrochemical systems. This white crystalline solid combines excellent ionic conductivity, thermal stability, and compatibility with electrode materials, making it a key enabler for sustainable energy storage solutions that leverage abundant sodium resources.

Chemical & Physical Properties

NaFSI exhibits a set of properties that make it a standout choice for sodium-based electrolytes:

Solubility: Highly soluble in a range of organic solvents, including ethylene carbonate (EC), dimethyl carbonate (DMC), and propylene carbonate (PC), enabling the formulation of high-concentration electrolytes for diverse battery chemistries.

Ionic Conductivity: Delivers high ionic conductivity (up to 8 mS/cm in optimized solvent mixtures), facilitating efficient sodium-ion transport in battery cells—comparable to leading lithium-based electrolytes.

Thermal Stability: Maintains stability at temperatures up to approximately 180°C, significantly higher than conventional sodium salts like sodium hexafluorophosphate (NaPF₆), reducing the risk of thermal runaway in batteries.

Electrochemical Window: Boasts a wide electrochemical stability window (up to 5.0 V vs. Na⁺/Na), compatible with high-voltage cathodes (e.g., sodium nickel manganese oxide, NaNi₀.₅Mn₀.₅O₂) used in high-energy-density SIBs.

Hydrolytic Stability: More resistant to hydrolysis than NaPF₆, generating fewer corrosive byproducts (e.g., HF) when exposed to moisture, enhancing long-term battery durability.

Key Applications in Energy Storage

Sodium bis(fluorosulfonyl)imide (CAS 371162-53-7) is pivotal to advancing sodium-based energy storage technologies:

Sodium-Ion Batteries (SIBs): Serves as a main electrolyte salt in SIBs, which are emerging as a low-cost alternative to lithium-ion batteries for grid storage, renewable energy integration, and stationary applications. Its high conductivity and stability improve SIB cycle life and rate performance.

Sodium-Metal Batteries: Enables the development of sodium-metal batteries by forming a stable solid electrolyte interphase (SEI) on sodium metal anodes, suppressing dendrite growth and enhancing safety.

Sodium-Based Supercapacitors: Utilized in electrolytes for sodium-ion supercapacitors, where its high conductivity and stability contribute to improved power density and cycle life, suitable for short-duration energy storage.

Redox Flow Batteries: Explored as an electrolyte additive in sodium-based redox flow batteries, enhancing solubility of redox-active species and improving overall cell efficiency.

Advantages Over Conventional Sodium Salts

NaFSI offers significant benefits compared to traditional sodium electrolyte salts like NaPF₆ and sodium perchlorate (NaClO₄):

Cost-Effectiveness: Enables the use of sodium, an abundant and low-cost element, reducing reliance on scarce lithium resources and lowering battery production costs.

Stability: Superior thermal and chemical stability minimizes electrolyte decomposition, reducing gas generation and improving battery safety—critical for large-scale stationary storage.

Compatibility: Works with a broad range of SIB electrode materials, including hard carbon anodes and layered oxide cathodes, supporting the development of high-performance sodium-ion systems.

Performance: Enhances cycle life (by 30–50% in many formulations) and high-rate capability, making SIBs more competitive with lithium-ion technologies in specific applications.

Synthesis & Quality Control

NaFSI is synthesized through precise processes to ensure high purity and consistency:

Precursor Formation: Fluorosulfonyl isocyanate (FSO₂NCO) reacts with hydrogen fluoride (HF) to form bis(fluorosulfonyl)amine (HFSI), a key intermediate.

Sodiation: HFSI is neutralized with sodium hydroxide (NaOH) or sodium carbonate (Na₂CO₃) in an organic solvent, followed by crystallization to produce NaFSI.

Purification: Recrystallization from anhydrous solvents and drying under vacuum remove residual moisture and impurities, ensuring purity levels of 99.9% or higher.

Quality control involves ion chromatography (IC) for anion analysis, inductively coupled plasma mass spectrometry (ICP-MS) for trace metal detection, and Karl Fischer titration to verify moisture content (typically below 10 ppm).

Safety & Handling

Proper handling of NaFSI is essential due to its properties:

Hygroscopicity: Absorbs moisture readily from the air, which can affect performance; store in sealed containers under an inert atmosphere (e.g., nitrogen or argon).

Toxicity: May cause skin and eye irritation; use chemical-resistant gloves, goggles, and a lab coat when handling. In case of contact, rinse thoroughly with water.

Reactivity: Avoid contact with strong reducing agents and combustible materials, as it may act as an oxidizer under extreme conditions.

Storage: Keep in a cool, dry, well-ventilated area, away from heat sources and direct sunlight.

Refer to the product’s Safety Data Sheet (SDS) for detailed safety guidelines.

Packaging & Availability

We offer NaFSI in various forms to suit different applications:

Anhydrous Powder: Packaged in moisture-proof aluminum bags (100g–10kg) with inert gas purging to prevent hydration.

Solutions: Available as pre-dissolved solutions (5–20% w/w) in organic solvents (e.g., EC/DMC mixtures) for easy integration into electrolyte formulations, packaged in 1L–50L containers.

Bulk quantities (50kg+ drums) are available for industrial-scale production. Custom purities and particle sizes can be provided to meet specific customer requirements.

For technical specifications, pricing, or sample requests, contact our sales team, which specializes in advanced electrolyte materials for sodium-based energy storage.

Health & Safety Information

 Signal Word: Warning 

Hazard Statements: H315-H319-H335 

Hazard Codes: Xi 

Risk Codes: 36/37/38 

Safety Statements: 26 

RTECS Number: N/A 

Transport Information: N/A 

WGK Germany: 3

Chemical Identifiers

 Linear Formula: C24BF20Li · 2.5C4H10O 

Pubchem CID: 23701484 

MDL Number: MFCD01861289 

EC No.: N/A 

IUPAC Name: lithium; ethoxyethane; tetrakis(2,3,4,5,6-pentafluorophenyl) boranuide 

SMILES: [Li+].[B-](C1=C(C(=C(C(=C1F)F)F)F)F)(C2=C(C(=C(C(=C2F)F)F)F)F)(C3=C(C(=C(C(=C3F)F)F)F)F)C4=C(C(=C(C(=C4F)F)F)F)F.CCOCC

 InchI Identifier: InChI=1S/C24BF20.C4H10O.Li/c26-5-1(6(27)14(35)21(42)13(5)34)25(2-7(28)15(36)22(43)16(37)8(2)29,3-9(30)17(38)23(44)18(39)10(3)31)4-11(32)19(40)24(45)20(41)12(4)33;1-3-5-4-2;/h;3-4H2,1-2H3;/q-1;;+1 

InchI Key: KPLZKJQZPFREPG-UHFFFAOYSA-N

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 735 gallon liquid totes Special package is available on request.