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Properties of composites of metal hydride alloys synthesized by mechanical milling

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Abstract

Hydride-forming alloys are used as negative electrode components of nickel metal hydride (MH) batteries. Generally, commercially used compounds are made of two types of alloys, rare earth based on LaNi5, known as AB5 type, and alloys based on ZrCr2, ZrV2, ZrMn2, and TiMn2, known as AB2 type (Laves phases). A and B are generally composed of more than one element. In both systems, the A components are metals that form stable hydrides, while the B components are transition metals and form less stable hydrides. In the present work, electrodes were prepared using composite material obtained by mechanical milling of different proportions of ZrTiV0.8Ni2Cr0.52Mn0.56Co0.08Al0.04 (AB2) and LaNi3.6Co0.7Mn0.4Al0.3 (AB5) alloys. The particles of the AB5 alloy were dispersed on the surface of the AB2 particles, as shown by scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS). The discharge capacity of the electrodes improved with the addition of 80 and 50 weight-% AB2. The maximum discharge capacities obtained, after 30 cycles, for electrodes with 50 and 80 % AB2 were above 200 mA h g−1, while for the original AB2 alloy it was less than 170 mA h g−1. A decrease in the composite concentration of the AB2 alloy improves the exchange current density, as can be seen from electrochemical impedance spectroscopy (EIS) measurements. High-rate dischargeability (HRD) and EIS results showed enhanced hydrogen diffusion for the samples with an AB2 concentration of 50 and 80 %.

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Acknowledgments

This work was supported by Agencia Nacional Promoción Científica y Tecnológica of Argentina, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Catamarca and Universidad Nacional de La Plata.

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Authors and Affiliations

  1. Centro de Investigaciones y Transferencia de Catamarca (CITCA), CONICET-UNCA, Prado 366, K4700AAP, San Fernando del Valle de Catamarca, Catamarca, Argentina

    R. M. Humana

  2. Facultad de Ciencias Exactas y Naturales, UNCA, Av. Belgrano N° 300, 4700, Catamarca, Argentina

    R. M. Humana

  3. Centro Atómico Bariloche (CAB), Comisión Nacional de Energía Atómica (CNEA), Instituto Balseiro–Universidad Nacional de Cuyo (IB-UNCu), CONICET, Av. Bustillo 9500 CAB, 8400, San Carlos de Bariloche, Argentina

    F. C. Ruiz & H. A. Peretti

  4. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas y Naturales, UNLP, CCT La Plata-CONICET, C.C. 16, Suc. 4, 1900, La Plata, Argentina

    J. E. Thomas, E. B. Castro & A. Visintin

Authors
  1. R. M. Humana
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  2. F. C. Ruiz
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  3. J. E. Thomas
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  4. H. A. Peretti
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  5. E. B. Castro
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  6. A. Visintin
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Corresponding author

Correspondence to A. Visintin.

Additional information

E. B. Castro passed away in 2013

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Humana, R.M., Ruiz, F.C., Thomas, J.E. et al. Properties of composites of metal hydride alloys synthesized by mechanical milling. J Solid State Electrochem 21, 153–160 (2017). https://doi.org/10.1007/s10008-016-3347-8

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  • DOI: https://doi.org/10.1007/s10008-016-3347-8

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