Abstract
In order to improve the overall electrochemical properties of AB5-type storage alloys, the new type composite alloys M1Ni3.5Co0.6Mn0.4Al0.5–x wt% Mm0.89-Mg0.11-Ni2.97Mn0.14Al0.20Co0.54 (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 (I 0 ), the limiting current density (I L ), and the diffusion coefficient of hydrogen (D) of the alloy electrodes increase, leading to a corresponding improvement of the high rate dischargeability.
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