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3R type AB4 hydrogen storage alloy as well as preparation method and application thereof

A hydrogen storage alloy and alloy technology, applied in electrical components, circuits, battery electrodes, etc., can solve the problems of alloy capacity decay, poor cycle stability, mismatch, etc.

Active Publication Date: 2018-12-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • 3R type AB4 hydrogen storage alloy as well as preparation method and application thereof
  • 3R type AB4 hydrogen storage alloy as well as preparation method and application thereof
  • 3R type AB4 hydrogen storage alloy as well as preparation method and application thereof

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preparation example Construction

[0038] The invention also provides the 3R type AB 4 The preparation method of hydrogen storage alloy includes the following steps:

[0039] Mix the metal elements corresponding to the alloying elements and perform induction melting to obtain a multi-element as-cast alloy;

[0040] The multi-element as-cast alloy is annealed to obtain 3R type AB 4 Hydrogen storage alloy.

[0041] The present invention mixes the metal elements corresponding to the alloying elements and performs induction smelting to obtain a multi-element as-cast alloy; the present invention does not have any special restrictions on the mixing, and the mixing process is well known to those skilled in the art.

[0042] In the present invention, it is preferable to weigh an amount slightly higher than the composition of the alloy element when mixing elemental metals corresponding to the alloy elements. In the present invention, the amount slightly higher than the alloying element composition is preferably controlled withi...

Embodiment 1

[0059] Press La 0.40 Sm 0.30 Mg 0.30 Ni 4.0 Weigh and mix La, Sm, Mg, Ni, and conduct vacuum induction melting at 1200°C to obtain La-Sm-Mg-Ni-based multi-element cast alloy;

[0060] Put the La-Sm-Mg-Ni-based multi-element as-cast alloy in a vacuum annealing furnace at a temperature of 6×10 -3 Under the condition of Pa, the temperature is increased from room temperature to 600°C at a rate of 5°C / min; the temperature is increased from 600°C to 1000°C at a rate of 1°C / min for 8 hours; La stacked structure 0.40 Sm 0.30 Mg 0.30 Ni 4.0 alloy.

[0061] Will the La 0.40 Sm 0.30 Mg 0.30 Ni 4.0 The alloy is crushed and passed through a 400 mesh sieve, and the La 0.40 Sm 0.30 Mg 0.30 Ni 4.0 The alloy is subjected to XRD testing. figure 1 In order to adopt the Rietveld method to La 0.40 Sm 0.30 Mg 0.30 Ni 4.0 The full spectrum fitting performed on the XRD pattern of the alloy is determined by figure 1 It can be seen that the La 0.40 Sm 0.30 Mg 0.30 Ni 4.0 Alloy is 3R type AB 4 Super stacking ...

Embodiment 2

[0064] Press La 0.70 Sm 0.05 Mg 0.25 Ni 3.72 Al 0.10 Weigh and mix La, Sm, Mg, Ni, Al, and conduct vacuum induction smelting at 1400°C to obtain La-Sm-Mg-Ni-Al-based multi-element cast alloy;

[0065] Put the La-Sm-Mg-Ni-Al-based multi-element as-cast alloy in a vacuum annealing furnace at a temperature of 6×10 -3 Under the condition of Pa, the temperature is increased from room temperature to 600°C at a rate of 8°C / min; then the temperature is increased from 600°C to 1005°C at a rate of 1°C / min for 12 hours; Stacked La 0.70 Sm 0.05 Mg 0.25 Ni 3.72 Al 0.10 alloy.

[0066] Will the La 0.70 Sm 0.05 Mg 0.25 Ni 3.72 Al 0.10 The alloy is crushed and passed through a 400 mesh sieve, and the La 0.70 Sm 0.05 Mg 0.25 Ni 3.72 Al 0.10 The alloy is subjected to XRD testing. figure 2 In order to adopt the Rietveld method to La 0.70 Sm 0.05 Mg 0.25 Ni 3.72 Al 0.10 The full spectrum fitting of the XRD pattern of the alloy is obtained by figure 2 It can be seen that the La 0.70 Sm 0.05 Mg 0.25 Ni...

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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 present invention relates to the technical field of nickel-hydrogen 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 burned in large quantities, causing serious environmental pollution. In order to protect the environment, people are actively seeking new green energy to replace traditional fossil energy and developing 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 shortcomings in the transportation and storage of hydrogen energy, so hydrogen storage materials have become a key issue for hydrogen energy utilization. [0003] As ...

Claims

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Application Information

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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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