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Hydrogen-absorbing alloy electrode and alkaline storage battery

A hydrogen storage alloy and electrode technology, which is applied in the field of alkaline storage batteries using the hydrogen storage alloy electrode as the negative electrode, can solve the problems of decreased cycle life of alkaline storage batteries, depletion of alkaline electrolyte, etc., and achieve high capacity, hydrogen storage powerful effect

Inactive Publication Date: 2006-03-01
SANYO ELECTRIC CO LTD
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Problems solved by technology

[0009] However, when an alkaline storage battery using a hydrogen storage alloy having the above-mentioned crystal structure as the negative electrode is repeatedly charged and discharged, the alkaline electrolyte in the diaphragm is depleted, causing the cycle life of the alkaline storage battery to decrease.

Method used

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  • Hydrogen-absorbing alloy electrode and alkaline storage battery

Examples

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Effect test

Embodiment 1～7

[0026] In Examples 1 to 7, when producing negative electrodes, a hydrogen storage alloy obtained by the following method was used as the first hydrogen storage alloy.

[0027] When producing the first hydrogen storage alloy, after mixing rare earth elements La, Pr, Nd, Mg, Ni, Al, and Co according to a predetermined alloy composition, they are melted at 1500° C. in an induction melting furnace, and then cooled to produce Obtain a hydrogen storage alloy ingot. The composition of the hydrogen storage alloy was analyzed by ICP (high-frequency plasma spectrometry), and the result obtained was that the composition of the hydrogen storage alloy was (La 0.2 PR 0.4 Nd 0.4 ) 0.83 Mg 0.17 Ni 3.03 Al 0.17 co 0.10 , and the Co content in the hydrogen storage alloy was 2.0% by weight.

[0028] Next, the hydrogen storage alloy ingot was mechanically pulverized and classified in an inert atmosphere to obtain a first hydrogen storage alloy powder having the above composition. Here, t...

Embodiment 8 and comparative example 2

[0054] In Example 8, the weight-average particle diameter of the second hydrogen storage alloy is 53 μm, and the alloy composition is (La 0.80 Ce 0.14 PR 0.02 Nd 0.04 ) Ni 3.49 co 0.90 mn 0.30 al 0.29 hydrogen storage alloy powder. In addition, this second hydrogen storage alloy also has CaCu 5 type crystal structure, the Co content in this second hydrogen storage alloy was 12.2% by weight.

[0055] In Comparative Example 2, the weight-average particle size of the second hydrogen storage alloy was 65 μm, and the alloy composition was La 0.17 PR 0.33 Nd 0.33 Mg 0.17 Ni 2.6 mn 0.5 al 0.2 , Hydrogen storage alloy powder containing Mn but not containing Co. The second hydrogen storage alloy has Ce 2 Ni 7 type of crystal structure.

[0056] Next, the same first hydrogen storage alloy powder as in Examples 1 to 7 above and the second hydrogen storage alloy above were mixed in a weight ratio of 90:10 in Example 8 and in a weight ratio of 98:2 in Comparative Example ...

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Abstract

A hydrogen-absorbing alloy for a negative electrode in an alkaline storage battery includes a first hydrogen-absorbing alloy and a second hydrogen-absorbing alloy.The first hydrogen storing alloy which contains at least the rare earth element, Mg, Ni and Al and in which a strength ratio IA / IBof the maximum peak strength IAwhich appears in a range of 2[theta]=31-33[deg.] in X-ray diffraction measurement using Cu-K[alpha] beam as a X-ray source to the maximum peak strength IBwhich appears in a range of 2[theta]=40-44[deg.] is 0.1 or greater, a second hydrogen storing alloy is added which has a Co content more than the first hydrogen storing alloy.

Description

[0001] related application [0002] This application is an application claiming priority based on Japanese Patent Application Nos. 2004-245655 and 2005-173072. technical field [0003] The present invention relates to a hydrogen storage alloy electrode and an alkaline storage battery using the hydrogen storage alloy electrode as a negative pole, in particular to improving the capacity of the alkaline storage battery, the hydrogen storage alloy electrode of the negative pole contains at least rare earth elements, magnesium, nickel, aluminum, The strongest peak intensity I that appears in the range of 2θ=31-33° in X-ray diffraction measurement using Cu-Kα ray as X-ray source A and the strongest peak intensity I appearing in the range of 2θ=40~44° B The intensity ratio I A / I B In the alkaline storage battery of hydrogen storage alloy above 0.1, the feature of the present invention is to improve the electrode of the hydrogen storage alloy, so that the cycle life of the alkalin...

Claims

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Application Information

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IPC IPC(8): H01M4/24H01M4/38H01M10/24
CPCY02E60/124Y02E60/10
Inventor 安岡茂和曲佳文村田徹行田中忠佳石田润
Owner SANYO ELECTRIC CO LTD
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