Electrochemical properties of M1Ni3.5Co0.6Mn0.4Al0.5-x wt% Mm0.89Mg0.11Ni2.97Mn0.14Al0.20Co0.54 composites

In order to improve the overall electrochemical properties of ABs-type storage alloys, the new type composite alloys M1Ni3.5Co0.6Mn0.4Al0.5-x wt% Mm0.89Mg0.11Ni2.97Mn0.14Al0.20Co0.54 （x = 0, 5, 10; M1 means mischmetal） were prepared by means of ball milling. The composite alloys are shown to be single LaNi5 phase by X-ray diffraction （XRD） patterns. The maximum discharge capacity slightly increases from 315 mAh·g^-1 for M1Ni3.5Co0.6Mn0.4Al0.5 to 324 mAh·g^-1 （x = 5） and 325 mAh·g^-1 （x = 10）. The addition of AB3-type La-Mg- Ni-based alloy has a positive effect on the cycle stability. With the addition of Mm0.89Mg0.11Ni2.97Mn0.14-Al0.20Co0.54 alloy, the exchange current density （I0）, the limiting current density （IL） and the diffusion coefficient of hydrogen （D） of the alloy electrodes increase, leading to a corresponding improvement of the high rate dischargeability.