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Nanocrystalline alloy hydrides formed by mechanical alloying.

Jurczyk M., Nowak M., Jankowska E., Gąsiorowski A.

Inżynieria Materiałowa

2001

R. XXII, nr 4

416-418

This article presents the work carried out on nanocrystalline Mg2Ni, LaNi5, ZrV2 and TiFe phases, which were prepared by mechanical alloying (MA) and then annealing. XRD analysis showed that, after -40 h milling the studied alloys have decomposed into amorphous phases. Following annealing in high purity argon, XRD confirmed the formation of ordered materials. These alloys were used as active materials for the negative electrodes of an alkaline, rechargeable nickel-metal hydride (Ni-NHx) batteries. The electrochemical results show the substantial difference between the nanocrystalline and the amorphous powders. For example, in the nanocrystalline TiFe0.5Ni0.5 powders discharging capacities up to 125 mA h g to the -1 (at 40 mA g to the -1discharge current) have been measured. MA process has recently emerged as a novel technique for producing nanostructured alloy powders with interesting electrochemical properties.