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Synthesis of Ti-doped $Li_3AIH_6$ powders by mechanochemical reaction and their thermal decomposition behavior  

Lee, E.K. (School of Materials Science and Engineering, Seoul National University)
Kim, Y.K. (NanoMaterials Research Center, Korea Institute of Science and Technology)
Cho, Y.W. (NanoMaterials Research Center, Korea Institute of Science and Technology)
Yoon, J.K. (School of Materials Science and Engineering, Seoul National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.16, no.1, 2005 , pp. 92-101 More about this Journal
Abstract
[ $Li_3AlH_6$ ] (5.6wt% theoretical hydrogen storage capacity) powders with and without Ti-containing dopants have been successfully synthesized by mechanochemical reaction near room temperatures from mixtures of LiH and $LiAlH_4$ powders. It has been observed that single phase $Li_3AlH_6$ could be obtained within 2-3 hours of milling, but the addition of reactive $TiCl_2\;or\;TiCl_3$ to the starting mixtures. caused partial decomposition of $LiAlH_4$ into LiCl and free Al with gaseous $H_2$. By addition of these reactive dopants to the as-synthesized $Li_3AlH_6$, this problem could be solved. The addition of 2 mol% $TiCl_2\;or\;TiCl_3\;to\;Li_3AlH_6$ decreased the decomposition start temperature up to 30-50$^{\circ}C$, while that of Ti or $TiH_2$ did not change the thermal decomposition behavior of $Li_3AIH_6$.
Keywords
Hydrogen storage materials; Complex metal hydride; Mechanochemical reaction; Thermal decomposition;
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