Lithium Sulfide Li2S 99.99 percent CAS 12136-58-2

Lithium Sulfide Li2S 99.99 percent – High-Purity Powder for Advanced Batteries

Basic Information

• CAS Number: 12136-58-2

• Molecular Formula: Li₂S

• Molecular Weight: 45.95 g/mol

• Appearance: White to yellow crystals

• Purity: ≥ 99.99 percent

• Density: 1.66 g/cm³ (relative to water)

• Melting Point: 938°C

• Boiling Point: 1372°C

• Crystal Structure: Anti-fluorite type; exists in orthorhombic and cubic forms (density 1.75 g/cm³ and 1.63 g/cm³ respectively)

Overview
Lithium sulfide is a high-purity inorganic compound specifically developed for next-generation energy storage systems. It forms a solid white powder when sulfur reacts with lithium. It is easily soluble in water and exhibits semiconducting properties with a band gap of 3.865 eV. Its unique structure and electrochemical characteristics make it a promising material for high-capacity lithium-sulfur batteries.

Applications

• Electrode materials: Used directly as a cathode material in lithium-sulfur batteries, offering high theoretical capacity and overcoming common issues associated with pure sulfur electrodes, such as polysulfide dissolution and volume expansion.

• Solid electrolyte precursor: Serves as a key precursor for the synthesis of sulfide-based solid electrolytes (e.g., Li₃PS₄, Li₆PS₅Cl), which enable safe, high-energy all-solid-state batteries.

• Superconductor research: Investigated for superconducting properties similar to MgB₂.

• Other uses: Potential applications in catalysis and as a reagent in organic synthesis.

Key Benefits

• High purity ensures consistent electrochemical performance.

• High specific capacity – significantly exceeds that of conventional cathode materials.

• Addresses sulfur electrode challenges – improves cycle stability and coulombic efficiency.

• Versatile – can be used directly or as a precursor for solid-state electrolytes.

• Semiconducting nature – beneficial for charge transport.

Storage and Handling
Lithium sulfide is highly sensitive to moisture, which can degrade its dispersibility and electrochemical properties. It must be stored in hermetically sealed containers under an inert atmosphere (argon or nitrogen) in a cool, dry place. Avoid exposure to air, moisture, and strong oxidizers. Use appropriate personal protective equipment (gloves, goggles, dust mask) when handling.

Packaging
Available in 10 g, 50 g, 100 g, 500 g, and 1 kg bottles with inert gas flushing. Custom packaging on request.

Shelf Life
12 months when stored under recommended conditions (dry, inert atmosphere, sealed).

Quality Assurance
Each batch is analyzed for purity (ICP-OES), particle size distribution, specific surface area (BET), and moisture content to ensure compliance with battery-grade specifications.