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Modified lithium borohydrides for reversible hydrogen storage (2).

Ming Au1, Arthur Jurgensen, Kristine Zeigler

  • 1Savannah River National Laboratory, Aiken, South Carolina 29808, USA. ming.au@srnl.doe.gov

The Journal of Physical Chemistry. B
|December 22, 2006
PubMed
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Researchers enhanced lithium borohydride for hydrogen storage by adding magnesium chloride and titanium chloride. This mixture releases 5 wt% hydrogen at 60°C and can be refueled at 600°C and 70 bar.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Lithium borohydride (LiBH4) is a promising material for reversible hydrogen storage due to its high hydrogen density.
  • However, high temperatures are required for hydrogen release and uptake, limiting its practical application.
  • Developing effective destabilization agents is crucial to lower operating temperatures.

Purpose of the Study:

  • To investigate the destabilization of lithium borohydride for improved reversible hydrogen storage.
  • To identify additives that reduce hydrogen desorption temperatures and enhance cycling stability.
  • To understand the interaction mechanisms between LiBH4 and potential destabilizing agents.

Main Methods:

  • Screening of various metals, metal hydrides, and metal chlorides as additives for LiBH4.

Related Experiment Videos

  • Thermodynamic and kinetic analysis of hydrogen desorption and absorption processes.
  • Characterization of material composition and structural changes using X-ray diffraction and Raman spectroscopy.

    • Main Results:

    • A composite of LiBH4 + 0.2MgCl2 + 0.1TiCl3 demonstrated significant improvement in hydrogen release.
    • This composite desorbed 5 wt% of hydrogen starting at a low temperature of 60°C.
    • Rehydrogenation to 4.5 wt% was achieved at 600°C and 70 bar, indicating good reversibility.
    • X-ray diffraction and Raman spectroscopy revealed interactions between LiBH4 and the additives, altering B-H stretching.

    Conclusions:

    • The addition of magnesium chloride and titanium chloride effectively destabilizes LiBH4, lowering desorption temperatures.
    • The LiBH4 + MgCl2 + TiCl3 system shows potential for practical reversible hydrogen storage applications.
    • Further research into the observed structural changes can optimize the hydrogen storage capacity and kinetics.