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Synergistic Effects of Light Rare Earth Element and Gd on the Electrochemical Performances of Ce2Ni7-type La-Mg-Ni-based Alloys

The influences of light rare earth element and Gd substitution for La on the phase structures, and electrochemical properties of La 0.43 R 0.2 Gd 0.2 Mg 0.17 Ni 3.1 Co 0.3 Al 0.1 (R = La, Ce, Pr, Nd, Y, Sm, Gd, Yb) alloys have been investigated. Compared to basic La 0.83 Mg 0.17 Ni 3.1 Co 0.3 Al 0.1 alloy, the alloys consist of a main Ce 2 Ni 7 -type (RE,Mg) 2 Ni 7 phase, plus a few Gd 2 Co 7 -type phase and CaCu 5 -type LaNi 5 phase. R = La promotes the formation of Ce 2 Ni 7 -type super-stacking phases. Further study shows that partial replacement of La for other rare earth elements stimulates the formation of Gd 2 Co 7 -type phase. Electrochemical analysis shows that the cycling stability for the alloy with R = La reaches 91.4% after 100 charge/discharge cycles. Meanwhile the maximum discharge capacity is improved to 389.94 mAh g -1 . We conclude that R = La increases the phase abundance of Ce 2 Ni 7 -type structure so that the discharge capacity and cycling stability are enhanced. The substitution of other rare earth elements increases the phase abundance of Gd 2 Co 7 -type so as to deteriorate the electrochemical performances. Alloys with R = La shows the optimal electrochemical performances.