Tuning LiBH₄ for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches

Area of Science:

• Materials Science
• Chemical Engineering
• Energy Storage

Background:

• Hydrogen is a key energy vector for a low-carbon future.
• Efficient hydrogen storage remains a critical challenge for mobile and stationary applications.
• Lithium borohydride (LiBH4) offers high gravimetric (18.5 wt.%) and volumetric (121 kgH2/m3) hydrogen densities.

Purpose of the Study:

• To review and discuss strategies for optimizing the thermodynamics and kinetics of LiBH4 for hydrogen storage.
• To explore various destabilization and catalytic approaches for LiBH4 systems.
• To examine the impact of nanoconfinement on LiBH4-based hydrogen storage materials.

Main Methods:

• Review of existing literature on LiBH4 modification and hydrogen storage.
• Analysis of destabilization mechanisms involving MgH2, metal/metal hydrides, and rare-earth metal hydrides.
• Investigation of nanoconfinement effects on LiBH4 and its composites.
• Discussion of reaction pathways and catalytic effects.

Main Results:

• LiBH4 + MgH2 systems show improved hydrogen release.
• Addition of specific metals and metal hydrides can enhance LiBH4 performance.
• Rare-earth metal hydrides act as effective destabilizing agents.
• Nanoconfinement strategies improve hydrogen storage properties of LiBH4.

Conclusions:

• Various strategies, including composite formation and nanostructuring, can significantly improve LiBH4's suitability for hydrogen storage.
• Further research into reaction pathways and catalytic effects is crucial for practical application.
• Optimized LiBH4 systems hold potential for efficient mobile and stationary energy solutions.