Abstract
A cobalt-free, non-stoichiometric hydrogen storage alloy of composition ML(NiCuAl) 5.2 was prepared by vacuum induction melting followed by gas atomization or the melt spinning method. The alloy powder prepared by melt spinning processing showed better cycling stability than the as-cast alloy, while the hydrogen storage capacity, electrochemical discharge capacity and activation kinetics were not significantly degraded. The alloy powder prepared by atomization processing showed a lower hydrogen storage capacity and worse comprehensive electrode performance than the melt spun alloy, probably due to the oxidation and phase segregation occurring during the atomization process.
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