The relation between the discharge capacity and cycling number of mechanically alloyed MgxNi100-x amorphous electrode alloys

The relation between the discharge capacity and cycling number of mechanically alloyed MgxNi100-x amorphous electrode alloys was proposed on the basis of the fact that the degradation of discharge capacity was mainly caused by the oxidation of magnesium and nickel. The experimental data fitted the deduced equation well. Partial substitution of Co, Si or Al for Ni may improve the cycling life of amorphous MgxNi100-x alloys just as predicted by the deduced equation; however, their initial discharge capacities were dramatically reduced.