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Electrochemical Charge for the Formation of Metal Hydrides from LiH+M (M=Mg, Al)

Published online by Cambridge University Press:  31 January 2011

Nobuko Hanada
Affiliation:
n-hanada@sophia.ac.jp, Department of Enginnering and Applied Sciences, Sophia University, Tokyo, Japan
Akito kamura
Affiliation:
a-kamura@sophia.ac.jp, Department of Enginnering and Applied Sciences, Sophia University, Tokyo, Japan
Hiroshi Suzuki
Affiliation:
h-suzuki@me.sophia.ac.jp, Department of Enginnering and Applied Sciences, Sophia University, Tokyo, Japan
Takayuki Ichikawa
Affiliation:
tichi@hiroshima-u.ac.jp, Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima, Japan
Yoshitsugu Kojima
Affiliation:
kojimay@hiroshima-u.ac.jp, Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima, Japan
Kenichi Takai
Affiliation:
takai@me.sophia.ac.jp, Department of Enginnering and Applied Sciences, Sophia University, Tokyo, Japan
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Abstract

For a formation of metal hydride of MgH2 or AlH3 under room temperature and ambient pressure, the cathode electrodes of metal and lithium hydride are electrochemically charged with Li anode electrodes in the system of Li-ion extraction. For MgH2 formation, the VC (Voltage-Composition) curve of Mg + 2LiH during charge shows a plateau voltage at 0.6 V until the final composition of 1.05 Li extraction. After charge MgH2 phase is observed by the XRD measurement. Therefore MgH2 is produced by the electrochemical charge from Mg and LiH. For AlH3 formation, Al + 3LiH is charged until the final composition of 0.6 Li at a plateau voltage of 0.8 V which corresponds to the reaction between Al and LiH for the formation of AlH3. In the XRD profile after charge AlH3 phase is not detected although the intensities of Al and LiH decrease compared with these before charge, which suggests the reaction leading to the formation of AlH3.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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Electrochemical Charge for the Formation of Metal Hydrides from LiH+M (M=Mg, Al)
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