Lithium Tetracyanoplatinate(II) HydrateCAS #: 699012-91-4

Synonyms

 Lithium platinum cyanide, Lithium tetrakis(cyano-κC)platinate(2-) hydrate (2:1:1), C4Li2N4Pt

Compound Formula: C4H2Li2N4OPt 

Molecular Weight: 313.051 

Appearance: Solid 

Melting Point: N/A 

Boiling Point: N/A 

Density: N/A 

Solubility in H2O: N/A 

Exact Mass: 331.02 g/mol 

Monoisotopic Mass: 331.02 g/mol

Product Introduction: Sodium Bis(trifluoromethanesulfonyl)imide (NaTFSI, CAS #: 699012-91-4)

Sodium bis(trifluoromethanesulfonyl)imide, with the chemical formula NaN(SO₂CF₃)₂ and CAS number 699012-91-4, is an advanced sodium salt that has gained significant attention as a high-performance electrolyte material in sodium-ion batteries (SIBs) and other sodium-based electrochemical systems. This white crystalline solid is celebrated for its exceptional ionic conductivity, broad electrochemical stability, and superior thermal and hydrolytic stability, making it a key enabler for next-generation sodium-based energy storage solutions that prioritize durability and performance

Chemical & Physical Properties

NaTFSI exhibits a suite of properties that distinguish it as a premium electrolyte salt for sodium-based systems:

Solubility: Highly soluble in a wide range of organic solvents, including ethylene carbonate (EC), dimethyl carbonate (DMC), and propylene carbonate (PC), as well as in ionic liquids. This versatility allows for the formulation of high-concentration electrolytes tailored to specific battery chemistries.

Ionic Conductivity: Delivers excellent ionic conductivity (up to 10 mS/cm in optimized solvent mixtures), facilitating efficient sodium-ion transport in SIBs and enabling high-rate charge-discharge performance.

Thermal Stability: Maintains stability at temperatures up to approximately 300°C, significantly outperforming conventional sodium salts like sodium hexafluorophosphate (NaPF₆) and enhancing battery safety in high-temperature environments.

Electrochemical Window: Boasts an exceptionally wide electrochemical stability window (up to 5.5 V vs. Na⁺/Na), compatible with high-voltage cathodes such as sodium nickel manganese oxide (NaNi₀.₅Mn₀.₅O₂) and sodium vanadium phosphate (Na₃V₂(PO₄)₃), which are critical for high-energy-density SIBs.

Hydrolytic Stability: Exhibits strong resistance to hydrolysis, minimizing the formation of corrosive byproducts like hydrofluoric acid (HF) even when exposed to moisture. This property extends the lifespan of battery components and reduces maintenance requirements.

Key Applications in Energy Storage

Sodium bis(trifluoromethanesulfonyl)imide (CAS 699012-91-4) is pivotal to advancing sodium-based energy storage technologies:

Sodium-Ion Batteries (SIBs): Serves as a primary electrolyte salt in high-performance SIBs, which are emerging as cost-effective alternatives to lithium-ion batteries for grid storage, renewable energy integration, and large-scale stationary applications. Its stability and conductivity improve SIB cycle life (often exceeding 2,000 cycles) and rate capability.

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—a critical challenge in realizing high-energy-density sodium-metal systems.

Sodium-Based Supercapacitors: Utilized in electrolytes for sodium-ion supercapacitors, where its high conductivity and stability contribute to enhanced power density and long cycle life, making it suitable for applications requiring rapid energy delivery.

Hybrid Electrolyte Systems: Integrated into composite and gel polymer electrolytes for SIBs, improving mechanical strength while maintaining high ionic conductivity, a key step toward solid-state sodium batteries.

Advantages Over Conventional Sodium Salts

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

Stability: Superior thermal, chemical, and hydrolytic stability reduces electrolyte degradation, minimizing gas generation and extending battery lifespan—critical for stationary storage systems with long service requirements.

Performance: Enables higher energy and power densities in SIBs by supporting high-voltage cathodes and fast charge-discharge rates, narrowing the performance gap with lithium-ion batteries.

Compatibility: Works seamlessly with a broad range of SIB electrode materials, including hard carbon anodes, layered oxides, and polyanionic cathodes, providing flexibility in battery design.

Safety: Reduced risk of thermal runaway and HF formation enhances battery safety, making it suitable for large-scale installations and consumer applications.

Synthesis & Quality Control

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

Precursor Formation: Trifluoromethanesulfonyl fluoride (CF₃SO₂F) reacts with ammonia (NH₃) to form bis(trifluoromethanesulfonyl)amine (HTFSI), a key intermediate.

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

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 NaTFSI 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 NaTFSI 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: H317-H319-H335 

Hazard Codes: Xi 

Precautionary Statements: P261-P280-P305 + P351 + P338 

Risk Codes: 36/37-43 

Safety Statements: 26-36 

RTECS Number: N/A 

Transport Information: N/A 

WGK Germany: 3 

GHS Pictogram: Image

Chemical Identifiers

 Linear Formula: Li2Pt(CN)4• H2O 

Pubchem CID: 16217371 

MDL Number: MFCD00798528 

EC No.: 238-370-2 

IUPAC Name: dilithium; platinum(2+); tetracyanide; hydrate 

SMILES: [Li+].[Li+].[C-]#N.[C-]#N.[C-]#N.[C-]#N.O.[Pt+2] 

InchI Identifier: InChI=1S/4CN.2Li.H2O.Pt/c4*1-2;;;;/h;;;;;;1H2;/q4*-1;2*+1;;+2 

InchI Key: HHVBKTDUKGKBKP-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.