Abstract
Mechanical alloying was used in the synthesis of Mg0.8Ti0.2-xMnxNi (x = 0, 0.025, 0.05, 0.1) quaternary alloys to analyze the effect of Mn substitution for Ti on the electrochemical performance of MgNi alloys. The milling was carried out for 25 h. By adding a small amount of Mn (x = 0.025) to the Mg0.8Ti0.2Ni alloy, a completely amorphous structure was obtained. The maximum discharge capacity of the Mg0.8Ti0.175Mn0.025Ni alloy was observed as 543 mAh g−1 at the initial charge/discharge cycle. When x = 0 and x = 0.05, the discharging performances of Mg0.8Ti0.2-xMnxNi alloys were approximately the same. However, when x = 0.1, the lowest initial discharge capacity (401 mAh g−1) and discharge capacity performance were observed. The capacity retention rates of Mg0.8Ti0.175Mn0.025Ni, Mg0.8Ti0.2Ni, Mg0.8Ti0.05Mn0.05Ni, and Mg0.8Ti0.1Mn0.1Ni alloys were 81%, 68%, %67, and 47%, respectively, at the 20th cycle.
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