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

Keywords

alloys, metal hydride electrode, electrochemical properties, cyclic stability, high-rate discharge ability, exchange current density, limiting current density, hydrogen diffusion coefficient.

Cite as

Verbovytskyy Yu. V. Electrochemical charge-discharge characteristics of RMgNi_3.5Mn_0.5 alloys. Physicochemical Mechanics of Materials. 2025. 61(3), 137-143.

https://doi.org/10.15407/pcmm2025.03.137

Abstract

The RMgNi_3.5Mn_0.5 (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 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 cycle stability of the electrode materials was investigated at a charge-discharge current density of 200 mA/g. Electrodes based on PrMgNi_3.5Mn_0.5 and NdMgNi_3.5Mn_0.5 exhibit high-rate discharge ability (HRD) and high-rate charge ability (HRC) at currents up to 1000 mA/g. It is found that these indicators correlate with the obtained exchange current density, limiting current density and hydrogen diffusion coefficient.

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