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Electrochemical characterization of negative electrodes consisting of surface-modified Zr0.9Ti0.1(Ni1.1Co0.1Mn0.5V0.2Cr0.1)x Laves-phase alloys

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Abstract

Laves-phase hydrogen storage alloy has a high potential for use as negative electrode material as alternative for the misch-metal-based material. In order to improve the energy density and the rate capability of negative electrode, chemical and mechanical modification of Lavesphase alloy with different stoichiometric ratios was carried out. Discharge capacity and high-rate dischargeabilty was evaluated by electrochemical methods and the characterization of Laves-phase alloy was made by X-ray diffraction, SEM observation and PCT measurement. The best result in discharge capacity could be obtained for stoichiometric Laves-phase alloy with a composition of Zr0.9Ti0.1Ni1.1Co0.1Mn0.5V0.2Cr0.1 by boiling in 10 M KOH solution. On the other hand, the high-rate dischargeability was increased remarkably by introducing mechanical grinding before alkali treatment. The cause for improved performance was discussed on the basis of thermodynamic stability of metal hydride and changes in crystal structure and surface morphology influencing on diffusion coefficient and diffusion path length of hydrogen.

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Authors and Affiliations

  1. Department of Applied Chemistry, Ritsumeikan University, Nojihigashi, Kusatusu, Shiga, 525-8577, Japan

    Masao Matsuoka, Tsuyoshi Matsuda, June Tamaki & Yoshifumi Yamamoto

  2. Department of Applied Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    Chiaki Iwakura

Authors
  1. Masao Matsuoka
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  2. Tsuyoshi Matsuda
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  3. June Tamaki
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  4. Yoshifumi Yamamoto
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  5. Chiaki Iwakura
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Correspondence to Masao Matsuoka.

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Matsuoka, M., Matsuda, T., Tamaki, J. et al. Electrochemical characterization of negative electrodes consisting of surface-modified Zr0.9Ti0.1(Ni1.1Co0.1Mn0.5V0.2Cr0.1)x Laves-phase alloys. Res Chem Intermed 32, 389–402 (2006). https://doi.org/10.1163/156856706777973682

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  • DOI: https://doi.org/10.1163/156856706777973682

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