Magnesium-based hydrogen storage alloys have been also considered to be possible candidates for electrodes in Ni-MH batteries. In this work, we have studied experimentally the structure and properties of Mg₂Ni(Cu)/M-type hydrogen storage nanocomposite materials (M=C, Ni, Pd). These materials were prepared by mechanical alloying (MA) followed by annealing and ball milling, respectively. In nanocrystalline Mg₂Cu powder, discharge capacities up to 26 mA h g^-1 were measured. It was found that nickel substituting copper in Mg₂(Cu-Ni) alloy greatly improved the discharge capacity of studied material. In nanocrystalline Mg₂Ni powder, discharge capacities up to 100 mA h g^-1 were measured. Additionally, mechanically coated Mg₂Ni-based alloys with graphite, nickel, copper or palladium have effectively reduced the degradation rate of the studied electrode materials. They show substantially enhanced cycle life, at room temperature. Results also showed that the strong modifications of the electronic structure of the nanocrystalline alloys could significantly influence on their hydrogenation properties.

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1. Effect of palladium addition on the electrochemical properties of an amorphous 2Mg+ 3d alloys doped by nickel atoms (3d = Fe, Ni)