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A type 3r ab 4 Hydrogen storage alloy and its preparation method and application

A technology for hydrogen storage alloys and alloys, which can be used in nickel storage batteries, structural parts, circuits, etc., and can solve problems such as poor cycle stability, alloy capacity attenuation, and mismatching

Active Publication Date: 2019-09-03
YANSHAN UNIV
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  • Application Information

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Problems solved by technology

Although people have prepared AB containing 3R type 4 However, the reported alloys are all multi-phase structures, and studies have shown that there is a serious mismatch between the phase structures of multi-phase hydrogen storage alloys during the hydrogen absorption and desorption process. After repeated hydrogen absorption and desorption cycles , the capacity of the alloy decays rapidly, resulting in poor cycle stability

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  • A type 3r ab <sub>4</sub> Hydrogen storage alloy and its preparation method and application
  • A type 3r ab <sub>4</sub> Hydrogen storage alloy and its preparation method and application
  • A type 3r ab <sub>4</sub> Hydrogen storage alloy and its preparation method and application

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[0038] The present invention also provides the described 3R type AB 4 A method for preparing a hydrogen storage alloy, comprising the following steps:

[0039] Mix the metal elements corresponding to the alloying elements and conduct induction melting to obtain multi-element cast alloys;

[0040] Annealing the multi-element as-cast alloy to obtain 3R type AB 4 Hydrogen storage alloys.

[0041] The present invention mixes the metal elements corresponding to the alloying elements and conducts induction melting to obtain a multi-element cast alloy; the present invention does not have any special limitation on the mixing, and the mixing process can be carried out by using a mixing process well known to those skilled in the art.

[0042] In the present invention, when mixing the simple metals corresponding to the alloying elements, it is preferable to weigh an amount slightly higher than the composition of the alloying elements. In the present invention, the amount slightly high...

Embodiment 1

[0059] Press La 0.40 SM 0.30 Mg 0.30 Ni 4.0 The ratio of La, Sm, Mg, Ni was weighed and mixed, and vacuum induction melting was carried out at 1200 ° C to obtain La-Sm-Mg-Ni-based multi-element cast alloy;

[0060] The La-Sm-Mg-Ni-based multi-element cast alloy was placed in a vacuum annealing furnace at 6×10 -3 Under the condition of Pa, the temperature was raised from room temperature to 600°C at a rate of 5°C / min; then the temperature was raised from 600°C to 1000°C at a rate of 1°C / min, and kept for 8 hours; finally, the temperature was lowered to room temperature with the furnace to obtain a 3R super Stacked La 0.40 SM 0.30 Mg 0.30 Ni 4.0 alloy.

[0061] the La 0.40 SM 0.30 Mg 0.30 Ni 4.0 After the alloy is pulverized, pass through a 400-mesh sieve, and the sieved La 0.40 SM 0.30 Mg 0.30 Ni 4.0 The alloy was tested by XRD. figure 1 In order to adopt the Rietveld method for La 0.40 SM 0.30 Mg 0.30 Ni 4.0 The full-spectrum fitting of the XRD pattern of th...

Embodiment 2

[0064] Press La 0.70 SM 0.05 Mg 0.25 Ni 3.72 al 0.10 The ratio of La, Sm, Mg, Ni, Al was weighed and mixed, and vacuum induction melting was carried out at 1400 ° C to obtain La-Sm-Mg-Ni-Al-based multi-element cast alloy;

[0065] The La-Sm-Mg-Ni-Al based multi-element as-cast alloy was placed in a vacuum annealing furnace at 6×10 -3 Under the condition of Pa, the temperature was raised from room temperature to 600 °C at a rate of 8 °C / min; then the temperature was raised from 600 °C to 1005 °C at a rate of 1 °C / min, and kept for 12 hours; finally, the temperature was lowered to room temperature with the furnace to obtain a 3R super Stacked La 0.70 SM 0.05 Mg 0.25 Ni 3.72 al 0.10 alloy.

[0066] the La 0.70 SM 0.05 Mg 0.25 Ni 3.72 al 0.10 After the alloy is pulverized, pass through a 400-mesh sieve, and the sieved La 0.70 SM 0.05 Mg 0.25 Ni 3.72 al 0.10 The alloy was tested by XRD. figure 2 In order to use the Rietveld method for La 0.70 SM 0.05 Mg 0....

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Abstract

The invention provides a 3R type AB4 hydrogen storage alloy. Nd, Gd, Y or Pr replaces La in La-Mg-Ni-series alloy, and Co, Mn or Al replaces Ni in the La-Mg-Ni-series alloy, and adding amount of ND, Gd, Y or Pr as well as Co, Mn or Al is controlled, so that comprehensive electrochemical properties of the alloy are improved to certain extent. According to the record of the embodiment, the 3R type AB4 hydrogen storage alloy has only a 3R type super-stack structure. High-rate discharge performance and cycling stability of the La-Mg-Ni-series alloy are improved. The invention further provides a preparation method for the 3R type AB4 hydrogen storage alloy, and the preparation method is simple, is convenient to operate, is easy in production condition control, is suitable for large-scale production, and industrial benefits are realized.

Description

technical field [0001] The invention relates to the technical field of nickel metal hydride battery anode materials, in particular to a 3R type AB 4 Hydrogen storage alloy and its preparation method and application. Background technique [0002] Since the beginning of the 21st century, the global economy has developed rapidly, and fossil fuels such as coal, oil, and natural gas have been burned in large quantities, causing serious environmental pollution. In order to protect the environment, people actively seek new green energy to replace traditional fossil energy and develop energy-saving technologies. As an important secondary energy source, hydrogen energy has a wide range of sources and good combustion performance. It is a clean, green and environmentally friendly energy source. However, there are still deficiencies in the transportation and storage of hydrogen energy, so hydrogen storage materials have become a key issue in the utilization of hydrogen energy. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C19/03C22F1/10H01M4/38H01M10/30
CPCC22C1/023C22C19/03C22C2202/04C22F1/10H01M4/383H01M10/30Y02E60/10
Inventor 韩树民王文凤刘晓雪张爽张璐赵雨萌
Owner YANSHAN UNIV
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