Abstract
The hydriding and structural characteristics of amorphous MgNix alloys prepared by mechanical alloying have been investigated with charge–discharge tests and X-ray photoelectron spectroscopy (XPS) in combination with X-ray excited Auger electron spectroscopy (XAES). It was found that the increase in Ni content lead to a significantly enhancement in cycle performance of MgNix alloys. XPS and XAES investigations indicated the existence of a significantly thicker Ni enriched layer for the MgNi1.5 and MgNi2.0 alloys than that for the MgNi alloy. These results reveal that excess of Ni in MgNix alloys may improve the cycle performance of alloy electrodes by suppressing the segregation of Mg during electrochemical cycling.
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