Sanyo Electric Co., Ltd.

Kousuke Satoguchi

Shin Fujitani

Koji Nishio

Mutsumi Yano

Mitsunori Tokuda

Ikuo Yonezu

Masao Inoue

Makoto Ochi

Teruhiko Imoto

Mitsuzo Nogami

Katsuhiko Shinyama

Motoo Tadokoro

Masao Takee

Tetsuyuki Murata

Yasuhiko Ikeda

Takashi Yamaguchi

Yasumasa Kondou

Kiyoshi Morita

After coating a hydrogen absorbing alloy slurry obtained by kneading a hydrogen absorbing alloy powder , a polyethylene oxide (PEO) powder as a binder , and a suitable amount of water (a solvent for binder) to both surfaces of a metal core plate (active material holder) made of a punching metal, the core plate is dried. Then, after removing the active material layer from the core plate by a means such as cutting and the like, a definite amount of water (a solvent for binder) is sprayed to the cut surface (the exposed surface of the core plate ) to attach the water to the cur surface followed by drying to provide a hydrogen absorbing alloy electrode , which is disposed at the outermost side of the electrode group.

Hydrogen absorbing alloy electrode, manufacturing method thereof, and alkaline storage battery equipped with the hydrogen absorbing alloy electrode

A sealed type alkaline storage battery in which the entire surface of a positive electrode plate is opposed to a negative electrode plate through a separator, wherein a discharge capacity ratio of the negative electrode plate to the positive electrode plate is determined to be more than or equal to 1.9, an area ratio of the negative electrode plate to the positive electrode plate is determined to be less than or equal to 1.4, and the thickness of the positive electrode plate is determined to be less than or equal to 0.6 mm

Sealed type alkaline storage battery

Non-sintered nickel electrodes for alkaline storage batteries which can express high active material utilization efficiency not only at the time of charging at ordinary temperature but also at the time of charging in a high-temperature atmosphere are provided by using an active material powder composed of composite particles each comprising a substrate particle containing nickel hydroxide, an inner coat layer covering the substrate particle and comprising yttrium, scandium or a lanthanoid, or an yttrium, scandium or lanthanoid compound, and an outer coat layer covering the inner coat layer and comprising cobalt or a cobalt compound, or composed of composite particles each comprising a substrate particle containing nickel hydroxide, an inner coat layer covering the substrate particle and comprising cobalt or a cobalt compound, and an outer coat layer covering the inner coat layer and comprising yttrium, scandium or a lanthanoid, or an yttrium, scandium or lanthanoid compound.

Non-sintered nickel electrode for alkaline storage battery

In the non-sintered nickel electrode for an alkaline storage battery according to the invention, a yttrium metal powder and/or a yttrium compound powder has been added to a particulate active material comprising composite particles each consisting of a nickel hydroxide core and a sodium-doped cobalt compound shell. Because the yttrium metal powder and/or yttrium compound powder inhibits the diffusion of cobalt into the nickel hydroxide core, the non-sintered nickel electrode of the invention exhibits a high utilization efficiency not only in an initial phase of charge-discharge cycling but over a long time of use. Moreover, because the yttrium metal powder and/or yttrium compound powder enhances the oxygen overpotential, the non-sintered nickel electrode for an alkaline storage battery according to the invention shows very satisfactory charge characteristics particularly at high temperatures.

Non-sintered nickel electrode for alkaline storage battery, alkaline

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Tokushima, Japan

Kousuke Satoguchi