Abstract
Amorphous Mg-based alloy Mg 63Ni 27Nd 10 was prepared by melt-spinning. The phase structures and the electrochemical properties of the ribbons before and after charge/discharge cycling were characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) analysis and galvanotactic charge–discharge cycle test, respectively. It was found that the amorphous structure begins to crystallize after four cycles of hydrogenation/dehydrogenation and a new nano-crystallized phase NdMg 2Ni 9 was detected with average grain size in the range 5–10 nm. A good cycle life and high discharge capacity were also observed in the Mg 63Ni 27Nd 10 alloy electrode. The highest discharge capacity reached 580.5 mAh g −1 at the discharge current densities of 50 mA g −1. It is suggested that homogeneous microstructure contributes to the enhancement in electrochemical characteristics, the presence of NdMg 2Ni 9 being beneficial for the improvement in cycle life of Mg 63Ni 27Nd 10 alloy electrode.
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