Effect of amorphous transformation on electrochemical capacities of rare earth-Mg based alloys

The effect of ball mill modification with Ni on the microstructure and electrochemical properties of La2Mg17 based and CeMg12 based hydrogen storage alloys, was characterized. The amount of the added Ni was one of the key factors controlling the earlier formation of homogenous amorphous phase for the ball-milled composites. The results of the study indicate that the electrochemical capacities of the composite samples were significantly associated with the amorphorization degree of the product and especially the diffuse peak position of their X-ray pattern in addition to the particle size and their microstructure.