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Hydrogen-absorbing alloy for alkaline storage batteries, alkaline storage battery, and method of manufacturing alkaline storage battery

A technology for hydrogen storage alloys and alkaline storage batteries, which is applied in the manufacture of alkaline storage batteries, electrodes of alkaline storage batteries, alkaline storage batteries, etc., which can solve the problems of increased resistance, consumption, and reduced cycle life of alkaline storage batteries, and prevent discharge Reduced capacity and improved cycle life

Active Publication Date: 2008-09-10
SANYO ELECTRIC CO LTD
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  • Description
  • Claims
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Problems solved by technology

[0007] However, when the hydrogen storage alloy powder is used as the negative electrode of the alkaline storage battery, and the charge and discharge are repeated, the alkaline electrolyte in the alkaline storage battery is gradually consumed while the hydrogen storage alloy powder is oxidized and deteriorated by the alkaline electrolyte. , which increases the resistance in the alkaline storage battery and reduces the cycle life of the alkaline storage battery

Method used

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  • Hydrogen-absorbing alloy for alkaline storage batteries, alkaline storage battery, and method of manufacturing alkaline storage battery
  • Hydrogen-absorbing alloy for alkaline storage batteries, alkaline storage battery, and method of manufacturing alkaline storage battery
  • Hydrogen-absorbing alloy for alkaline storage batteries, alkaline storage battery, and method of manufacturing alkaline storage battery

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Embodiment 1、2 and comparative example 1

[0030] In Examples 1, 2 and Comparative Example 1, when making the negative electrode, the rare earth elements La, Pr, Nd and Zr, Mg, Ni, Al and Co are used, and after mixing these elements to achieve the specified alloy composition, It is melted in an argon atmosphere, and then cooled to produce a composition of (La 0.2 PR 0.395 Nd 0.395 Zr 0.01 ) 0.83 Mg 0.17 Ni 3.03 al 0.17 co 0.1 hydrogen storage alloy blocks.

[0031] In addition, the hydrogen storage alloy ingot was heat-treated and homogenized, then mechanically pulverized and classified in an inert protective atmosphere to obtain the hydrogen storage alloy powder with a volume average particle diameter of 65 μm.

[0032] Here, for the hydrogen storage alloy powder produced in this way, an X-ray diffraction measurement device (RIGAKU RINT2000 series) using Cu-Kα rays as the X-ray source was used, and the scanning speed was 2° / min, the scanning step was 0.02°, and the scanning range was The scope of 20 °~80 °, c...

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Abstract

An alkaline storage battery includes a positive electrode ( 1 ) a negative electrode ( 2 ), and an alkaline electrolyte solution. The negative electrode uses a hydrogen-absorbing alloy powder containing at least a rare-earth element, Mg, Ni, and Al, and has an intensity ratio IA / IB of 0.1 or greater in X-ray diffraction analysis using Cu-Kalpha radiation, where IA is the strongest peak intensity that appears in the range of 2theta=31 to 33 DEG , and IB is the strongest peak intensity that appears in the range of 2theta=40 to 44 DEG . When the alkaline storage battery is activated, the condition M1 / M2<=0.18 is satisfied, where M1 is a Mg concentration in a region of particles of the hydrogen-absorbing alloy powder within 30 nm from the surface thereof and M2 is a Mg concentration in an inner region of the hydrogen-absorbing alloy particles in which the oxygen concentration is less than 10 weight %.

Description

technical field [0001] The present invention relates to a hydrogen storage alloy for alkaline accumulator, alkaline accumulator and alkaline accumulator manufacturing method, which is characterized in that as the negative electrode, one containing at least rare earth elements, magnesium, nickel and aluminum is used, and Cu-Kα rays are used as the X-ray In the X-ray diffraction measurement of the source, the strongest peak intensity I appears in the range of 2θ = 31 to 33° A And the strongest peak intensity I in the range of 2θ=40~44° B The intensity ratio I A / I B The hydrogen storage alloy powder is 0.1 or more, so that the hydrogen storage alloy can be prevented from deteriorating due to the reaction with the alkaline electrolyte, and the cycle life of the alkaline storage battery can be improved. Background technique [0002] Conventionally, nickel and cadmium storage batteries have generally been used as alkaline storage batteries. However, in recent years, nickel-hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/24H01M10/30C22C19/00C01B3/00C01B6/24H01M4/32H01M4/52
CPCC01B3/0057Y02E60/124H01M4/32H01M10/345H01M10/28Y02E60/327H01M4/242Y02E60/10Y02E60/32Y10T29/49108Y02P70/50
Inventor 石田润安冈茂和
Owner SANYO ELECTRIC CO LTD
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