High Reversible-Hydrogen Storage Capacity with Ultra-fast Kinetics of LiNH2/Li3N

This set of inventions describes novel matter a procedure to employ a combination of Lithium Oxide (Li2O) and Lithium Nitride (Li3N) to store (and release) hydrogen for use in hydrogen-based engines and fuel cells in vehicles. Lithium Nitride (Li3N) is known for lightness, high hydrogen capacity and fast kinetics, but also possesses disadvantages such as high heat generation, low stability and a propensity to sinter. The basic invention tides over these deficiencies by stabilizing Lithium Nitrid e with Lithium Oxide (Li2O) through a process of oxidation and hydrogenation. It is observed that reaction performance is further improved by pre-adding LiNH2 to the Li3N-Li2O combination. Different ratios of LiNH2 were pre-added to create different materials of varying hydrogen absorption efficiency. The new value propositions are:

Hydrogen is absorbed and released fast at reduced temperatures beginning at 180 oC. Higher temperatures make higher reaction rates possible.

The new m l has reversible H2 capacity of 6.8wt% (well above the desired floor of 6wt% by 2010 of the Department of Energy of the US Government )

The best results are for molar composition of LiNH2 between 28%-50%. Absorption rate over time is as follow o 6wt% H2 capacity in 20 minutes o 5wt% in 40 minutes o 6.8wt% finally

Refueling time is around 3 minutes as against the 2005 DoE target of 12-20 minutes.

A fuel tank made of this has a size and weight comparable to regular gas ular automobile can travel 300 miles with one fill.

The purity of material required is 99% and has been achieved.

Scalability and mass production of the material are readily possible.

Solid-substrate absorption of hydrogen is

Categories: Materials & Chemicals

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