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Mechanochemical synthesis of a Mg-Li-Al-H complex hydride

Published online by Cambridge University Press:  31 January 2011

Jing Zhang*
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Fusheng Pan
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
a) Address all correspondence to this author. e-mail:
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Mg-Li-Al alloy was prepared by ingot casting and then underwent subsequent reactive ball milling. A Mg-Li-Al-H complex hydride was obtained under a 0.4 MPa hydrogen atmosphere at room temperature, and as high as 10.7 wt% hydrogen storage capacity was achieved, with the peak desorption temperature of the initial step at approximately 65 °C. The evolution of the reaction during milling, as well as the effect of Li/Al ratio in the raw materials on the desorption properties of the hydrides formed, were studied by x-ray diffraction and simultaneous thermogravimetry and differential scanning calorimetry techniques. The results showed that mechanical milling increases the solubility of Li in Mg, leading to the transformation of bcc β(Li) solid solution to hcp α(Mg) solid solution, the latter continues to incorporate Li and Al, which stimulates the formation of Mg-Li-Al-H hydride. A lower Li/Al ratio resulted in faster hydrogen desorption rate and a greater amount of hydrogen released at a low temperature range, but sacrificing total hydrogen storage capacity.

Copyright © Materials Research Society 2009

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