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<p>The RMgNi<sub>3.5</sub>Mn<sub>0.5</sub> (R–La, Pr, Nd) alloys were investigated as materials for negative electrodes of nickel-metal hydride (Ni–MH) batteries. The electrodes are characterized by discharge capacities of 237–291 mAh/g at a&#xa0;charge-discharge current density of 30 mA/g. Cyclic voltammetry showed that the main charge-discharge reactions correspond to single-stage hydrogenation and dehydrogenation processes. The cyclic stability of the electrode materials was investigated at a&#xa0;charge-discharge current density of 200 mA/g. Electrodes based on PrMgNi<sub>3.5</sub>Mn<sub>0.5</sub> and NdMgNi<sub>3.5</sub>Mn<sub>0.5</sub> exhibit high-rate discharge ability (<i>HRD</i>) and high-rate charge ability (<i>HRC</i>) at currents up to 1000 mA/g. These indicators correlate with the obtained exchange current density, limiting current density, and hydrogen diffusion coefficient.</p>

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Electrochemical charge-discharge characteristics of RMgNi3.5Mn0.5 alloys

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Yu. V. Verbovytskyy

摘要

The RMgNi3.5Mn0.5 (R–La, Pr, Nd) alloys were investigated as materials for negative electrodes of nickel-metal hydride (Ni–MH) batteries. The electrodes are characterized by discharge capacities of 237–291 mAh/g at a charge-discharge current density of 30 mA/g. Cyclic voltammetry showed that the main charge-discharge reactions correspond to single-stage hydrogenation and dehydrogenation processes. The cyclic stability of the electrode materials was investigated at a charge-discharge current density of 200 mA/g. Electrodes based on PrMgNi3.5Mn0.5 and NdMgNi3.5Mn0.5 exhibit high-rate discharge ability (HRD) and high-rate charge ability (HRC) at currents up to 1000 mA/g. These indicators correlate with the obtained exchange current density, limiting current density, and hydrogen diffusion coefficient.