Effect of Surface Modification by Heating in Argon on Charge/Discharge Characteristics of Mg2Ni Electrode

Yuji Hatano; Tomoyuki Tachikawa; Koji Kobayashi; Katsunori Mori; Kuniaki Watanabe; Shotaro Morozumi

doi:10.2320/matertrans1989.40.919

Effect of Surface Modification by Heating in Argon on Charge/Discharge Characteristics of Mg₂Ni Electrode

Yuji Hatano, Tomoyuki Tachikawa, Koji Kobayashi, Katsunori Mori, Kuniaki Watanabe, Shotaro Morozumi

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Keywords: Mg₂Ni, magnesium, surface property, initial activation, evaporation, oxidation, porous metal, electrode, nickel/metal hydride battery

JOURNAL FREE ACCESS

1999 Volume 40 Issue 9 Pages 919-922

DOI https://doi.org/10.2320/matertrans1989.40.919

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Abstract

Charge/discharge characteristics of Mg₂Ni electrodes were examined by focussing attention on the influence of surface modification by heating in argon. The initial activation was significantly easier for the electrodes heated at 550°C than un-heated ones. The surfaces of electrodes became porous by the heating because of the evaporation of magnesium. A MgO layer was formed during the heating. The improvement of charge/discharge characteristics by the heating was ascribed to the increase in the specific surface area and the porosity of the oxide film, and to the formation of MgNi₂ and nickel phases which should act as the local reaction sites for hydrogen during the charge and discharge processes.

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