Electrochemical characteristics of Al-substituted Mg2Ni As negative electrode

Amorphous Mg2Ni alloy powder was prepared by solid state-diffusion and subsequent mechanical grinding. The effect of partial substitution of Al for Mg on the electrochemical performances of Mg2Ni was investigated. The results show that Mg2-xAlxNi (x=0.2, 0.3) has a long cycle life, up to 50 cycles at 200 mA/g discharge current density. It was found that the influence of Al, prolonging the cycle life, was mainly affected not by the discharge current density, but by the Al content. The mechanism of Al acting as an inhibitor of the corrosion was discussed.