Discharge Capacities of Mg_(1-x)Nd_xNi (x = 0, 0.05, 0.1, 0.2) Alloys Prepared by Mechanical Alloying

摘要

In this study, the Mg_(1-x)Nd_xNi (x = 0, 0.05, 0.1, and 0.2) alloys were prepared by mechanical alloying (MA), and their electrochemical properties were measured by simulated battery test. It is observed that the introduction of Nd can accelerate the formation of the amorphous structure of MgNi alloy. With the increasing milling time from 40 to 60 h, the initial discharge capacity of Mg_(1-x)Nd_xNi (x = 0, 0.05, 0.10, and 0.20) alloys increases gradually, while during the milling time from 60 to 70 h, it decreases. The maximum capacity of the Mg_(1-x)Nd_xNi alloys is gradually reduced with increasing Nd content x. With the milling time t = 60 h and x = 0, the discharge capacity is increased up to 378.2 mAh/g. Experimental results show that partial substitution of Mg with Nd can improve cyclic stability of the amorphous MgNi sample at the expense of a reduction in the initial capacity.