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Hydrogen storage alloy, electrode, nickel-metal hydride storage battery and manufacturing method of hydrogen storage alloy

一种贮氢合金、制造方法的技术，应用在贮氢合金领域，能够解决不能充分提高贮氢合金耐腐蚀性等问题，达到提高耐腐蚀性的效果

Active Publication Date: 2017-03-01
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, the corrosion resistance of the hydrogen storage alloy cannot be sufficiently improved.

Method used

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  • Hydrogen storage alloy, electrode, nickel-metal hydride storage battery and manufacturing method of hydrogen storage alloy
  • Hydrogen storage alloy, electrode, nickel-metal hydride storage battery and manufacturing method of hydrogen storage alloy
  • Hydrogen storage alloy, electrode, nickel-metal hydride storage battery and manufacturing method of hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0071] The chemical composition is in accordance with the situation described in the following Table 1. Weigh the raw material ingot with a specified amount, add Ni and Y to the crucible after adding La and Al, and use a high-frequency melting furnace under a reduced-pressure argon atmosphere to heat and melt to 1500 ℃, and then put in MgNi 2 , Ca melting. After melting, the melt spinning method is used for rapid cooling, and the alloy is solidified at 1000°C / sec. Then, the obtained alloy was heat-treated at 970° C. for 5 hours in an argon atmosphere, and then pulverized to obtain a hydrogen storage alloy powder having an average particle diameter (D50) of 50 μm.

Embodiment 6～10、 comparative example 4～6

[0094] The chemical composition is in accordance with the situation described in the following Table 2. Each raw material ingot is weighed with a specified amount, and after adding La, Ce, Pr, Nd, Al, Mn, Ni, Co, Y are added to the crucible, and the Under the use of high-frequency melting furnace heating to 1500 ℃, melting material. After melting, cooling was performed using a water-cooled mold at 50° C. / second to solidify the alloy. Then, the obtained alloys were heat-treated at 1000° C. for 5 hours in an argon atmosphere, and then pulverized to obtain hydrogen storage alloy powders with an average particle diameter (D50) of 50 μm. It should be noted,

[0095] The average particle diameter was measured using an MT3000 device manufactured by Microtrak.

reference example 1、2

[0099] The chemical composition is as described in the following Table 2. Weigh each raw material ingot with a specified amount, add Ni and Y to the crucible after adding La and Al, and heat and melt it to 1500 °C in a high-frequency melting furnace under a reduced-pressure argon atmosphere. ℃, and then put in MgNi 2 , Ca melting. After melting, the melt spinning method is used for rapid cooling, and the alloy is solidified at 1000°C / sec. Next, the obtained alloys were heat-treated at 970° C. for 5 hours in an argon atmosphere, and then pulverized to obtain hydrogen storage alloy powders with an average particle diameter (D50) of 50 μm.

[0100] (2) Determination of concentration distribution of Y

[0101] After the hydrogen storage alloy ingot is resin-fixed, it is ground and cleaned with sandpaper. It should be noted that instead of ingots, powders or nickel metal hydride storage battery electrode groups may be used. Grind in such a way that the cross-section of the ingo...

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Abstract

The present invention provides a hydrogen storage alloy excellent in corrosion resistance, an electrode and a nickel-metal hydride storage battery using the same, and a method for producing the hydrogen storage alloy. A hydrogen storage alloy, which contains La, Ni, and, Y or heavy rare earth elements and has at least two phases, the first phase has the general formula R1aR2bR3cNidR4e (wherein, R1 is at least one element with La as an essential component , R2 is at least one element selected from Y and heavy rare earth elements, R3 is Ca and / or Mg, R4 is at least one element selected from Co, Mn and Al, a, b, c, d and e is a value that satisfies a+b+c=1, 0≤b≤0.3, 0≤c≤0.4, 3.0<d+e<4.0, 0≤e≤1.) The composition shown, Y or heavy rare earth The concentration of the element is second higher than that of the first phase and dispersed in the first phase.

Description

technical field [0001] This invention relates to a hydrogen storage alloy excellent in corrosion resistance, an electrode and a nickel-metal hydride storage battery using the same, and a method for producing the hydrogen storage alloy. Background technique [0002] Hydrogen storage alloys are materials that can store hydrogen safely and easily, are expected as green energy sources, and are attracting attention as new energy storage and conversion materials. [0003] Although the application fields of such hydrogen storage alloys involve storage and transportation of hydrogen, storage and transportation of heat, conversion of thermo-mechanical energy, separation and purification of hydrogen, separation of hydrogen isotopes, nickel-metal hydride batteries, catalysts in synthetic chemistry, temperature Among them, nickel-metal hydride storage batteries using hydrogen storage alloys as negative electrode active materials are in increasing demand due to their advantages of small ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/24H01M10/30
CPCC22C19/03C22F1/10C01B3/0057B22F9/04C22C1/0433H01M4/383H01M10/345Y02E60/32Y02E60/10H01M4/242H01M4/0471H01M10/30
Inventor 金本学奥田大辅儿玉充浩
Owner GS YUASA INT LTD
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