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Hydrogen-absorbing-alloy-for-electrode-hydrogen-absorbing-alloy-electrode-and-alkaline-storage-battery

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Hydrogen absorbing alloy for electrode, hydrogen absorbing alloy electrode and alkaline storage battery

Details

Inventors: Tanaka, Tadayoshi; Harada, Yasuyuki; Shinyama, Katsuhiko; Matsuura, Yoshinori; Maeda, Reizo; Nohma, Toshiyuki; Yonezu, Ikuo;
Assignee: Sanyo Electric Co., Ltd. (Moriguchi, JP)
Primary Examiner: Weiner; Laura
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, LLP

In a hydrogen absorbing alloy electrode employed as a negative electrode of an alkaline storage battery, a covering layer containing at least one of metal elected from nickel and cobalt, and carbon particles is formed on a surface of the hydrogen absorbing alloy electrode or hydrogen absorbing alloy particles used in the hydrogen absorbing alloy electrode.

DETAILED DESCRIPTION An object of the present invention is to solve the above-mentioned problems in an alkaline storage battery wherein a hydrogen absorbing alloy electrode is employed as its negative electrode.
A first object of the present invention is to modify a hydrogen absorbing alloy for electrode and the hydrogen absorbing alloy electrode, to improve conductivity of the hydrogen absorbing alloy electrode.
A second object of the present invention is to modify the hydrogen absorbing alloy for electrode and the hydrogen absorbing alloy electrode, to prevent fully the hydrogen absorbing alloy from oxidation by oxygen that appears in a positive electrode when the battery is overcharged.
A third object of the present invention is to prevent hydrogen absorbing alloy particles from falling away from a current collector in the hydrogen absorbing alloy electrode wherein an electrode material using the hydrogen absorbing alloy particles is adhered to the current collector.
A fourth object of the present invention is to improve a high-rate discharge performance and a charge and discharge cycle performance in the alkaline storage battery wherein the hydrogen absorbing alloy electrode is employed as its negative electrode.
A first hydrogen absorbing alloy for electrode according to the present invention is a hydrogen absorbing alloy for electrode containing hydrogen absorbing alloy particles, wherein a covering layer containing at least one of metal elected from nickel and cobalt, and carbon particles is formed on a surface of said hydrogen absorbing alloy particles.
The conductivity of the hydrogen absorbing alloy electrode is improved by at least one of the metal elected from the nickel and the cobalt in the covering layer formed on the surface of the hydrogen absorbing alloy particles when the hydrogen absorbing alloy electrode using the first hydrogen absorbing alloy is employed as the negative electrode of the alkaline storage battery.
Further, the oxidation of the hydrogen absorbing alloy in the hydrogen absorbing alloy electrode is prevented by the carbon particles in the covering layer even in the case where the oxygen appears in the positive electrode when the battery is overcharged

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