Hydrogen-absorbing alloy for alkaline storage battery, and alkaline storage battery

a technology alloys, which is applied in the direction of nickel accumulators, cell components, sustainable manufacturing/processing, etc., can solve the problems of difficult to increase the capacity of alkaline storage batteries further, difficult to obtain hydrogen-absorbing alloys having a uniform structure, and generally not having sufficient hydrogen-absorbing capability. , to achieve the effect of improving the ability of hydrogen-absorbing and corrosion resistance, high capacity and superior cycle li

Inactive Publication Date: 2007-08-09
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0025]As a result, in the hydrogen-absorbing alloy for alkaline storage battery according to the present invention, the hydrogen-absorbing capability and the corrosion resistance are improved.
[0026]Further, in the prese

Problems solved by technology

However, these hydrogen-absorbing alloys generally do not necessarily have sufficient hydrogen-absorbing capability, and it has been difficult to increase the capacity of the alkaline storage batteries further.
Nevertheless, problems in producing the above-described hydrogen-absorbing alloy containing rare earth elements, nickel and magnesium by a metal mold casting process which is a conventional commonly used method, have been that it is difficult to obtain a hydroge

Method used

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  • Hydrogen-absorbing alloy for alkaline storage battery, and alkaline storage battery
  • Hydrogen-absorbing alloy for alkaline storage battery, and alkaline storage battery

Examples

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example 1

[0031]In Example 1, a hydrogen-absorbing alloy for alkaline storage battery used for a negative electrode was fabricated as follows. Mg, Ni, and Al as well as rare earth elements La, Pr and Nd were mixed together to produce a predetermined alloy composition, and the mixture was then melted in a high frequency induction melting furnace in argon gas atmosphere and then rapidly cooled by a rapid quenching method using a single roll casting apparatus to prepare a hydrogen-absorbing alloy ingot. The hydrogen-absorbing alloy ingot was subjected to a heat treatment at a temperature 35° C. lower than a liquefy beginning temperature Tm for 12 hours to prepare a hydrogen-absorbing alloy ingot having a composition of La0.18Pr0.34Nd0.34Mg0.13Ni3.17Al0.23. The liquefy beginning temperature Tm was determined by using a differential scanning calorimeter (DSC).

[0032]Subsequently, the resultant hydrogen-absorbing alloy ingot was mechanically pulverized in an inert atmosphere and classified to obtain...

example 2

[0038]In Example 2, a hydrogen-absorbing alloy for alkaline storage battery having a composition of La0.17Pr0.33Mg0.17Ni3.10Al0.20 was prepared in the same manner as Example 1 except that the mixing ratio of rare earth elements La, Pr and Nd, Mg, Ni, and Al was changed from that of the hydrogen-absorbing alloy of Example 1, and an alkaline storage battery of Example 2 using the hydrogen-absorbing alloy for alkaline storage battery was fabricated in the same manner as Example 1.

example 3

[0039]In Example 3, a hydrogen-absorbing alloy for alkaline storage battery having a composition of La0.18Pr0.36Nd0.36Mg0.11Ni3.20Al0.20 was prepared in the same manner as Example 1 except that the mixing ratio of rare earth elements La, Pr and Nd, Mg, Ni, and Al was changed from that of the hydrogen-absorbing alloy of Example 1, and an alkaline storage battery of Example 3 using the hydrogen-absorbing alloy for alkaline storage battery was fabricated in the same manner as Example 1.

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Abstract

A hydrogen-absorbing alloy for alkaline storage battery which is produced by a rapid cool using a rapid quenching method and whose component is represented by a general formula Ln1-xMgxNia-b-cAlbZc is used for a negative electrode of an alkaline storage battery.

Description

RELATED APPLICATIONS [0001]The priority applications Numbers Japanese Patent Applications 2006-32036, 2006-237931 and 2007-6537 upon which this patent application are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a hydrogen-absorbing alloy for alkaline storage battery, and to an alkaline storage battery employing a positive electrode, a negative electrodes using the hydrogen-absorbing alloy for alkaline storage battery, and an alkaline electrolyte. More particularly, a feature of the invention is an improvement in a hydrogen-absorbing alloy for alkaline storage battery used for a negative electrode in an alkaline storage battery, which utilizes, for the purpose of enhancing hydrogen-absorbing capability of the hydrogen-absorbing alloy and improving a cycle life of the alkaline storage battery.[0004]2. Description of Related Art[0005]Conventionally, nickel-cadmium storage batteries have been commonly used as...

Claims

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Application Information

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IPC IPC(8): H01M4/58C22C19/03C22C28/00C22C19/00H01M4/38H01M10/30
CPCC22C19/007C22C19/03Y02E60/124H01M10/345H01M4/383Y02E60/10Y02P70/50
Inventor MAGARI, YOSHIFUMIISHIDA, JUNYASUOKA, SHIGEKAZU
Owner SANYO ELECTRIC CO LTD
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