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# The effect of carbon and silicon-based additives on the hydrogen storage properties of Lithium Borohydride

Vines, Joshua Edwin (2017)
Ph.D. thesis, University of Birmingham.

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## Abstract

LiBH$$_4$$ was added to a number of different non-reactive additives in order to investigate their influence on the hydrogen storage properties of LiBH$$_4$$.
Graphite is a cheap and abundant material that has been used to destabilize hydrogen storage materials such as LiH. Ball milling graphite under Ar was shown to induce a higher amorphous content compared to milling under H$$_2$$. The addition of LiBH$$_4$$ to graphite milled under Ar resulted in a reduction of 102°C in the decomposition temperature of
LiBh$$_4$$.
The effect of porous additives was investigated through the incorporation of LiBH$$_4$$ into zeolite templated carbon (ZTC) and porous silicon. Confinement in these scaffolds resulted in a decrease in the decomposition temperature of LiBH$$_4$$ by 125°C. The smaller pore size of ZTC was found to have the greatest effect on the H$$_2$$ onset and cyclic stability of LiBh$$_4$$.
The pre-melting of LiBh$$_4$$ into porous scaffolds was shown to eliminate B$$_2$$H$$_6$$ release during decomposition. No correlation between the surface area of the additives and decomposition temperature of LiBH$$_4$$ was observed. Although none of the materials studied in this work meet the United States DoE targets, confinement of LiBH$$_4$$ in porous structures offers a promising approach to unlocking its potential.

Type of Work: Ph.D. thesis. Book, David Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Metallurgy and Materials TN Mining engineering. Metallurgy University of Birmingham 7542
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