Improved dehydrogenation properties of lithium alanate (LiAlH₄) doped by low energy grinding

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• 作者：Jie Fu^a ; Lars Rö ; ntzsch^b ; ^{Lars.Roentzsch@ifam-dd.fraunhofer.de} ; Thomas Schmidt^b ; Thomas Weiß ; gä ; rber^b ; Bernd Kieback^a ; ^b
• 关键词：Hydrogen storage material ; Lithium aluminum hydride ; Grinding ; Dehydrogenation ; Transition metal catalysts ; Thermogravimetry
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 June, 2012
• 卷：525
• 期：Complete
• 页码：73-77
• 文件大小：885 K

摘要

LiAlH₄ is an attractive hydrogen storage material because of its high gravimetric hydrogen storage capacity of 10.5 wt.%. There are various reports in the literature on doping LiAlH₄ with transition metals in order to improve its dehydrogenation kinetics. However, very often it was found that LiAlH₄ starts dehydrogenating already during doping, thereby, reducing the usable hydrogen storage capacity considerably.

In this study, LiAlH₄ was doped by low-energy grinding with different transition metal chlorides (ZrCl₄, TiCl₃ and NiCl₂). Thus, unwanted dehydrogenation during doping could be prevented. The positive effect of the dopants on promoting the dehydrogenation of LiAlH₄ was systematically studied by thermal analysis. In addition, the crystal phases were characterized by X-ray diffraction. In view of long-term storability of suchlike doped LiAlH₄, the weight change was monitored at room temperature up to seven months.