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Pr5Co19-type single-phase Pr4MgNi19 and La4MgNi19 alloys are prepared by powder sintering, and the capacity degradation behavior of the two alloys is investigated. The Pr4MgNi19 and La4MgNi19 alloy electrodes have similar discharge capacities but exhibit large differences in cycling stability. The capacity loss rate of Pr4MgNi19 alloy electrode is 22.5% at the 200th cycle, while that of La4MgNi19...
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