Overview
Lithium imide (Li₂NH) is an inorganic compound with significant potential in energy storage applications. As an intermediate between lithium amide (LiNH₂) and lithium nitride (Li₃N), it plays a crucial role in hydrogen storage systems due to its reversible hydrogen absorption/desorption properties. The compound was first characterized in the mid-20th century but gained industrial attention in the 2000s with the development of complex hydrides for hydrogen economy applications. Its ability to store up to 6.5 wt% hydrogen makes it particularly valuable for clean energy research.
Physical and Chemical Properties
Lithium imide appears as a white to grayish crystalline powder with a cubic crystal structure. It demonstrates remarkable thermal stability up to 400°C before decomposition begins. The material's density of 1.48 g/cm³ is typical for lithium-based compounds. Chemically, Li₂NH is highly reactive. It acts as a strong reducing agent and reacts exothermically with water, producing ammonia and lithium hydroxide. The compound is air-sensitive, gradually converting to lithium hydroxide and lithium carbonate upon exposure to moisture and carbon dioxide.
Main Applications
The primary application of lithium imide is in hydrogen storage systems, particularly for fuel cell vehicles and stationary energy storage. Its hydrogen capacity and moderate operating temperatures (150-250°C) make it attractive compared to metal hydrides. In battery technology, Li₂NH serves as a solid-state electrolyte component and anode material for lithium-ion batteries. Research also explores its use in ammonia synthesis catalysts and as a nitrogen source in specialty chemical production.
Safety and Storage
Lithium imide requires strict handling precautions due to its pyrophoric nature. It must be stored under inert gas (argon or nitrogen) in sealed containers with moisture-proof seals. Storage areas should be cool, dry, and equipped with fire suppression systems suitable for metal fires. Personnel must use appropriate PPE including face shields, flame-resistant clothing, and gloves when handling. Spills should be covered with dry sand or specialized metal fire extinguishing powder—never use water or conventional extinguishers.
B2B Procurement Guide
When procuring lithium imide, buyers should verify purity levels (typically 95-99%) and particle size specifications, which affect performance in hydrogen storage applications. Request detailed certificates of analysis including oxygen and moisture content. Consider suppliers with ISO 9001 certification and experience handling air-sensitive materials. Transportation requires UN-approved containers labeled as Dangerous Goods (Class 4.3). For research quantities, expect lead times of 2-4 weeks; bulk industrial orders may require custom synthesis arrangements.
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