CN115261675A - Single-phase or multi-phase AB4La-Y-Ni based superlattice hydrogen storage alloy and preparation method thereof - Google Patents

Single-phase or multi-phase AB4La-Y-Ni based superlattice hydrogen storage alloy and preparation method thereof Download PDF

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CN115261675A
CN115261675A CN202210858839.3A CN202210858839A CN115261675A CN 115261675 A CN115261675 A CN 115261675A CN 202210858839 A CN202210858839 A CN 202210858839A CN 115261675 A CN115261675 A CN 115261675A
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王辉
万常鹏
赵世谦
杨黎春
欧阳柳章
朱敏
姜伟
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South China University of Technology SCUT
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Abstract

The invention provides a single-phase or multi-phase AB4La-Y-Ni based superlattice hydrogen storage alloy, preparation method thereof, application of the hydrogen storage alloy in nickel-hydrogen electrodes, and nickel-hydrogen electrodes containing the hydrogen storage alloy. The chemical composition of the superlattice hydrogen storage alloy is La1‑ xYxNi4‑yMnyWherein x and y represent molar ratios, and the numerical ranges are as follows: x is more than or equal to 0.5 and less than or equal to 0.6, y is more than or equal to 0 and less than or equal to 0.33, and the superlattice hydrogen storage alloy is single-phase AB4Type superlattice hydrogen storage alloy or use AB4Multiphase AB with type phase as main phase4Type superlattice hydrogen storage alloys. The invention has simple process condition and low cost, and the prepared single-phase or multi-phase AB is4The superlattice alloy has the characteristics of high discharge capacity, long cycle life and good large-current discharge performance, and shows application potential as a nickel-hydrogen battery cathode material.

Description

Single-phase or multi-phase AB4La-Y-Ni based superlattice hydrogen storage alloy and preparation method thereof
Technical Field
The invention relates to the field of nickel-metal hydride batteries, in particular to a single-phase or multi-phase AB battery4La-Y-Ni based superlattice hydrogen storage alloy and preparation method thereof.
Background
Research on a novel hydrogen storage alloy having high capacity and long cycle life in a negative electrode material of a nickel metal hydride (Ni-MH) battery has received much attention. With conventional LaNi5Compared with the base anode material, the RE-Mg-Ni base (RE is a rare earth element) superlattice hydrogen storage alloy shows better discharge capacity (up to 414 mAh/g), activation performance and high-rate discharge performance because the superlattice structure of the alloy has the characteristics that n:1 (n =1, 2, 3 or 4) [ AB5 ]]And [ A2B4]The subunits are stacked alternately along the c-axis to form AB3Type A2B7Type A5B19Type or AB4A molding phase. RE-Mg-Ni based alloys have become the negative electrode material of third generation nickel-metal hydride batteries.
Research has shown that the Y element plays a similar role as the Mg element in the La-Ni-based superlattice alloy, and can inhibit hydrogen from causing amorphization in the hydrogen absorption/desorption process. In addition, the substitution of Y for Mg in the superlattice alloy can avoid the volatilization of Mg in high-temperature preparation. Yan et al prepared a2B7Type LaY2Ni9.7Mn0.5Al0.3Alloy of Ce2Ni7Type major phase and small amount of Gd2Co7Phase of the alloy, maximum discharge capacity of the alloyThe amount is 385.7mAh/g, and the discharge capacity retention rate after 300 cycles is 76.6 percent, which shows that the Y alloying can improve the hydrogen storage capacity of the alloy and the structural stability in the absorption/dehydrogenation process. Liu et al prepared Ce as the predominant phase2Ni7Form and Gd2Co7La of type3-xYxNi9.7Mn0.5Al0.3(x =1,1.5,1.75,2,2.25, 2.5) alloy, with increasing Y content, the maximum discharge capacity increased from 279.3mAh/g (x = 1) to 383.8mAh/g (x = 2.5). Therefore, the La-Y-Ni based alloy is expected to be a candidate material for a negative electrode of a high-capacity nickel-hydrogen battery.
The electrochemical properties of the alloy are closely related to the crystal structure. The unit cell volume of the alloy is adjusted by partial substitution of elements, and the unit cell volume has important influence on improving the hydrogen absorption/desorption plateau pressure and electrochemical discharge capacity of the hydrogen storage alloy. Wei et al prepared A2B7Type LaY2Ni10.5-xMnx(x =0.0,0.5,1.0, 2.0) alloy, the x =0.5 alloy achieved a maximum discharge capacity of 392.9mAh/g, much higher than the x =0 alloy 207.5mAh/g. Shi et al report on La5.42Y18.50Ni76.08-xMnx(x =0,2,4,6) alloy, laY2Ni9The phase abundance of the phases increased with increasing Mn content, increasing the discharge capacity from 275.2mAh/g to 379.6mAh/g. Therefore, the addition of Mn element is considered to be suitable for adjusting the thermodynamic properties of the La-Y-Ni-based hydrogen occluding alloy.
In the known superlattice structure, AB4Type superlattice structure of [ AB5]/[A2B4]The highest packing ratio, 44The formation of the matrix phase is difficult and usually crystallizes into a multiphase structure. Currently, single-phase AB is prepared only on the La-Mg-Ni base4Type alloys, e.g. Wang et al for La0.63Nd0.16Mg0.21Ni3.53Al0.11Annealing the alloy at 1010 ℃ for 24 hours to prepare trigonal AB4And (4) a phase structure. And AB in the La-Y-Ni based alloy4Type single phase structures have never been reported. Thus, study of Single-phase or multiphase AB4The preparation method and the electrochemical performance of the La-Y-Ni based superlattice hydrogen storage alloy are favorable for realizing the application of the La-Y-Ni based superlattice hydrogen storage alloy as nickel-hydrogen batteryApplication potential of the new material of the pool cathode.
Disclosure of Invention
In view of the above technical problems, it is a first object of the present invention to provide a single-phase or multi-phase AB having high capacity, long life and high current discharge performance4The specific technical scheme of the La-Y-Ni based superlattice hydrogen storage alloy is as follows:
AB4The La-Y-Ni based superlattice hydrogen storage alloy is characterized in that the chemical composition of the superlattice hydrogen storage alloy is La1-xYxNi4-yMnyWherein x and y represent molar ratios, and the numerical ranges are as follows: x is more than or equal to 0.5 and less than or equal to 0.6, y is more than or equal to 0 and less than or equal to 0.33, and the superlattice hydrogen storage alloy is single-phase AB4Type superlattice hydrogen storage alloy or use AB4Multiphase AB with type phase as main phase4Type superlattice hydrogen storage alloys.
The AB is4The space group of the type phase is R-3m, the abundance ratio of the phase is 74.9wt.% to 100wt.%, and the abundance ratio of the phase is AB4The XRD diffraction pattern of the type phase has a diffraction peak in the ranges of 2 theta = 31.46-31.54 degrees, 32.62-32.71 degrees, 35.95-36.04 degrees, 41.78-41.89 degrees, 42.60-42.71 degrees and 45.06-45.17 degrees, and the intensity ratio of six diffraction peaks is 26.6:9.2:37.7:29.2:100:20.7.
the AB is4The La-Y-Ni based superlattice hydrogen storage alloy is single-phase AB4Type La0.5Y0.5Ni3.67Mn0.33Superlattice hydrogen-storage alloy or multiphase AB4Type La0.4Y0.6Ni3.67Mn0.33A superlattice hydrogen storage alloy.
The single phase AB4Type La0.5Y0.5Ni3.67Mn0.33The maximum discharge capacity of the superlattice hydrogen storage alloy is 345.6mAh/g, and the capacity retention rate S is after 200 times of charge/discharge cycles20070.12%, and a discharge performance HRD600 of 84.03% at a current density of 600 mA/g; the multiphase AB4Type La0.4Y0.6Ni3.67Mn0.33The maximum discharge capacity of the superlattice hydrogen storage alloy is 312.8mAh/g, and the capacity retention rate S is 200 times of charge/discharge cycles20067.1% at 600mA/g electricityHigh rate capability HRD of flow density600The content was found to be 83.02%.
It is a second object of the present invention to provide an AB4The preparation method of the La-Y-Ni-based superlattice hydrogen storage alloy is characterized by comprising the following steps of:
(1) Selecting corresponding metal simple substances as raw materials according to the chemical composition of the superlattice hydrogen storage alloy for proportioning, considering the volatilization loss of La, Y and Mn in the smelting process, adding excessive La by 3 percent, Y by 1 percent and Mn by 5 percent in proportioning so as to compensate the burning loss, then preparing alloy ingots by adopting an electric arc smelting method, and in order to ensure the uniformity of the components of the ingots, each ingot is turned and remelted for 3-8 times;
(2) Sealing the alloy ingot obtained in the step (1) in a vacuum degree lower than 10-3A bar quartz tube, and then quenching: firstly, heating from room temperature to 600 ℃; then heating to 900 ℃, wherein the heating time of each temperature interval is 1.5h, and the heat preservation time of each temperature point is 1h; then continuously heating from 900 ℃ to 1050-1150 ℃ for 1h and preserving heat for 72h; finally water quenching is carried out to obtain AB4La-Y-Ni based superlattice hydrogen storage alloy.
It is a third object of the present invention to provide an AB4The La-Y-Ni based superlattice hydrogen storage alloy is applied to a nickel-hydrogen electrode.
The fourth object of the present invention is to provide a nickel-metal hydride electrode, characterized in that the nickel-metal hydride electrode is formed of the above AB4The La-Y-Ni based superlattice hydrogen storage alloy is prepared by the following specific steps of4Polishing the La-Y-Ni-based superlattice hydrogen storage alloy to remove a surface oxide layer, mechanically crushing the alloy in a glove box, grinding the crushed alloy into powder, sieving the powder by a 200-mesh sieve to obtain alloy powder, uniformly mixing the alloy powder and nickel powder, cold-pressing the mixture into an electrode plate with the diameter of 10mm under the pressure of 20MPa, coating the electrode plate in a foamed nickel substrate, and performing spot welding by using nickel strips to prepare the nickel-hydrogen electrode.
Compared with the prior art, the invention has the following beneficial effects:
(1) AB of the invention4The La-Y-Ni based superlattice hydrogen storage alloy not only inhibits hydrogen amorphization, but also can avoid the volatilization of Mg in high-temperature preparation by replacing Mg with Y. By passingThe alloy ingot obtained by arc melting is optimized in heat treatment temperature, and the alloy composition and AB are effectively controlled4The formation of a superlattice structure realizes single-phase or multi-phase AB4Preparing hydrogen storage alloy with type superlattice structure. The method has the advantages of simple operation and equipment, stable and easily-controlled process conditions, and convenience for industrial production and application.
(2) Single phase AB of the invention4The superlattice La-Y-Ni based hydrogen storage alloy has higher discharge capacity and good cycle stability, the maximum discharge capacity is 345.6mAh/g, and the capacity retention rate S is 200 times of charge/discharge cycles20070.12%, discharge performance HRD at a current density of 600mA/g600The content was 84.03%.
(3) Single-phase or multiphase AB of the invention4The superlattice La-Y-Ni based hydrogen storage alloy has low cost and excellent electrochemical performance, and can be widely used as a new material of a negative electrode of a nickel-metal hydride battery with high capacity, long service life and high-current discharge performance.
Drawings
FIG. 1 is a Rietveld full spectrum fit chart of La-Y-Ni based hydrogen storage alloy prepared in example 1 of the present invention.
FIG. 2 is a Rietveld full spectrum fit chart of the La-Y-Ni based hydrogen storage alloy prepared in example 2 of the present invention.
FIG. 3 is a Rietveld full spectrum fit chart of the La-Y-Ni based hydrogen storage alloy prepared in example 3 of the present invention.
FIG. 4 is a scanning electron microscope image of La-Y-Ni based hydrogen occluding alloys prepared in examples 1, 2 and 3 of the present invention.
FIG. 5 is an electrochemical cycle curve of La-Y-Ni based hydrogen occluding alloys prepared in examples 1, 2 and 3 of the present invention.
FIG. 6 is a high rate performance curve of La-Y-Ni based hydrogen occluding alloys prepared in examples 2 and 3 of the present invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Preparation of AB4The La-Y-Ni based superlattice hydrogen storage alloy is used for electrochemical performance test, and the electrochemical test method is as follows：
AB4The electrochemical test method of the La-Y-Ni based superlattice hydrogen storage alloy comprises the following steps: weighing a sample (0.1 g), uniformly mixing with nickel powder (0.4 g), cold-pressing into an electrode plate with the diameter of 10mm under the pressure of 20MPa, coating the electrode plate in a foamed nickel substrate, and performing spot welding by using a nickel strip to prepare the nickel-hydrogen working electrode.
The electrochemical test uses a working electrode (M/MH), a counter electrode (NiOOH/Ni (OH)2) And a reference electrode (Hg/HgO), the electrolyte being a 6mol/L KOH solution, all electrochemical tests being carried out in a 25 ℃ incubator. And testing the electrochemical charge-discharge cycle and high-rate discharge performance of the alloy electrode by using a LAND-CT2001A battery testing system.
AB4The electrochemical charge-discharge cycle test method of the La-Y-Ni-based superlattice hydrogen storage alloy comprises the following steps: the test electrode is kept stand for 1h at 6mol/KOH before electrochemical cycle test, charged for 8h at a current density of 60mA/g, kept stand for 10min, then discharged to a cut-off potential of-0.6V (vs. Hg/HgO) at a current density of 60mA/g, and kept stand for 10min, and then the next cycle is carried out until 300 electrochemical cycles are completed.
Example 1:
single-phase AB4Type La0.5Y0.5Ni4Preparing a superlattice hydrogen storage alloy:
the alloy comprises the following components: la0.5Y0.5Ni4Selecting metal simple substances La, Y and Ni as raw materials, adding excessive La 3% and Y1% during compounding to compensate for burning loss in consideration of volatilization loss of La and Y during smelting, and then preparing alloy ingots by arc smelting, and remelting each ingot by turning over for 5 times to ensure uniformity of ingot components; then sealing the alloy ingot to a vacuum degree of less than 10-3Quenching the bar quartz tube: firstly, heating from room temperature to 600 ℃; then heating to 900 ℃, wherein the heating time of each temperature interval is 1.5h, and the heat preservation time of each temperature point is 1h; then continuously heating from 900 ℃ to 1120 ℃ for 1h, and preserving the heat for 72h; and finally water quenching.
Polishing the heat-treated La-Y-Ni-based hydrogen storage alloy to remove a surface oxide layer, and then putting the alloy in a glove boxThe alloy was mechanically crushed and sieved through a grinding sieve, wherein the powder sieved through a 400 mesh sieve was used for X-ray powder diffraction (XRD) under the test conditions: cu-Kalpha rays are adopted, the power is 45KV multiplied by 40mA, the step length is 0.02 degrees, and the test range is 10-120 degrees. Quantitative analysis is carried out on the XRD result of the alloy by a Rietveld full-spectrum fitting analysis method, the fitting result is shown in figure 1, and the alloy is single-phase AB4Type superlattice alloy, AB4Space group of the phase structure is R-3m, and phase content is 100wt.%. The back-scattered image of the alloy was observed by means of a scanning electron microscope (SEM, zeiss Supra 40/VP), and the alloy was AB as shown in FIG. 4 (a)4The product is single-phase and has uniform phase composition.
The electrochemical performance test is carried out on the alloy powder with the particle size of 200-400 meshes, and the test result shows that the maximum discharge capacity of the alloy is 61.9mAh/g (shown in table 1 and figure 5).
Example 2:
single-phase AB4Type La0.5Y0.5Ni3.67Mn0.33Preparing the superlattice hydrogen storage alloy:
the alloy comprises the following components: la0.5Y0.5Ni3.67Mn0.33Selecting the metallic elements La, Y, ni and Mn as raw materials, adding an excess of 3% La, 1% Y and 5% Mn in compounding in consideration of volatilization loss of La, Y and Mn during melting to compensate for the burning loss, and then preparing an alloy ingot by an arc melting method, each ingot being turned over and remelted 5 times in order to secure uniformity of the ingot components; then sealing the alloy ingot to a vacuum degree of less than 10-3Quenching the bar quartz tube: firstly, heating from room temperature to 600 ℃; then heating to 900 ℃, wherein the heating time of each temperature interval is 1.5h, and the heat preservation time of each temperature point is 1h; then continuously heating from 900 ℃ to 1088 ℃ for 1h, and preserving heat for 72h; and finally water quenching.
Polishing the heat-treated La-Y-Ni-based hydrogen storage alloy to remove a surface oxide layer, then mechanically crushing the alloy in a glove box, and sieving the crushed alloy by a grinding sieve, wherein the powder sieved by a 400-mesh sieve is used for X-ray powder diffraction (XRD), and the test conditions are as follows: adopting Cu-Kalpha ray, the power is 45KV multiplied by 40mA, the step length is 002 degrees and the test range is 10 to 120 degrees. Quantitative analysis is carried out on the XRD result of the alloy by a Rietveld full-spectrum fitting analysis method, the fitting result is shown in figure 1, and the alloy is single-phase AB4Type superlattice alloy, AB4Space group of the phase structure is
Figure BDA0003755475080000051
The phase content was 100wt.%. The back-scattered image of the alloy was observed by means of a scanning electron microscope (SEM, zeiss Supra 40/VP), and the alloy was AB as shown in FIG. 4 (b)4The product is single-phase and has uniform phase composition.
The alloy powder of 200-400 meshes is taken for electrochemical performance test, and the test result shows that the maximum discharge capacity of the alloy is 345.6mAh/g, and the capacity retention rate S after 200 times of charge/discharge cycles20070.12%, high rate capability HRD at 600mA/g current density600The content was 84.03%. (see table 1, fig. 5, 6).
Example 3:
multiphase AB4Type La0.4Y0.6Ni3.67Mn0.33Preparing a superlattice hydrogen storage alloy:
the alloy comprises the following components: la0.4Y0.6Ni3.67Mn0.33Selecting the metallic elements La, Y, ni and Mn as raw materials, adding an excess of 3% La, 1% Y and 5% Mn in compounding in consideration of volatilization loss of La, Y and Mn during melting to compensate for the burning loss, and then preparing an alloy ingot by an arc melting method, each ingot being turned over and remelted 5 times in order to secure uniformity of the ingot components; then sealing the alloy ingot in a vacuum degree of less than 10-3Quenching the bar quartz tube: firstly, heating from room temperature to 600 ℃; then heating to 900 ℃, wherein the heating time of each temperature interval is 1.5h, and the heat preservation time of each temperature point is 1h; then continuously heating from 900 ℃ to 1120 ℃ for 1h, and preserving heat for 72h; and finally water quenching. Polishing the heat-treated La-Y-Ni-based hydrogen storage alloy to remove a surface oxide layer, then mechanically crushing the alloy in a glove box, and sieving the crushed alloy by a grinding sieve, wherein the powder sieved by a 400-mesh sieve is used for X-ray powder diffraction (XRD), and the test conditions are as follows: miningCu-Kalpha rays are used, the power is 45KV multiplied by 40mA, the step length is 0.02 degrees, and the test range is 10-120 degrees. Quantitative analysis is carried out on the XRD result of the alloy by a Rietveld full-spectrum fitting analysis method, the fitting result is shown in figure 1, and the alloy is multiphase AB4Type La0.4Y0.6Ni3.67Mn0.33Superlattice hydrogen storage alloy with main phase AB4Type phase, AB4Space group of the phase structure is
Figure BDA0003755475080000061
Phase content 74.9wt.%, further comprising 2H-A5B19Form phase, 2H-A5B19Space group of the type phase structure is P63/mmc, and the phase content is 25.1wt.%. The back-scattered image of the alloy was observed by means of a scanning electron microscope (SEM, zeiss Supra 40/VP), and the alloy contained two phases, AB, each, predominantly dark gray and slightly light gray, as shown in FIG. 4 (c)4And A5B19A molding phase.
The alloy powder of 200-400 meshes is taken to carry out electrochemical performance test, and the test result shows that the maximum discharge capacity of the alloy is 312.8mAh/g, the capacity retention rate S200 after 200 times of charge/discharge cycles is 67.1 percent, and the high rate performance HRD600 at 600mA/g current density is 83.02 percent. (see table 1, fig. 5, 6).
TABLE 1 AB4Electrochemical test performance of La-Y-Ni based superlattice hydrogen storage alloy
Figure BDA0003755475080000062
Figure BDA0003755475080000071
(1) TABLE 1 comparison of examples 2-3 with example 1 shows that AB4After Mn is added into the La-Y-Ni based superlattice hydrogen storage alloy, the maximum discharge capacity, the charge-discharge cycle performance and the high rate performance of the electrode are improved to a great extent;
(2) TABLE 1 comparison of examples 2-3 shows that the single phaseAB4Type La0.5Y0.5Ni3.67Mn0.33Superlattice hydrogen storage alloy more than multiphase AB4Type La0.5Y0.5Ni3.67Mn0.33The electrochemical performance of the superlattice hydrogen storage alloy is more excellent.

Claims (7)

1. AB4La-Y-Ni based superlattice hydrogen storage alloy, characterized in that the chemical composition of the superlattice hydrogen storage alloy is La1-xYxNi4-yMnyWherein x and y represent molar ratios, and the numerical ranges are as follows: x is more than or equal to 0.5 and less than or equal to 0.6, y is more than or equal to 0 and less than or equal to 0.33, and the superlattice hydrogen storage alloy is single-phase AB4Type superlattice hydrogen storage alloy or use AB4Multiphase AB with type phase as main phase4Type superlattice hydrogen storage alloys.
2. The superlattice hydrogen storage alloy as recited in claim 1 wherein said AB is4The space group of the type phase is R-3m, the abundance ratio of the phase is 74.9wt.% to 100wt.%, and the abundance ratio of the phase is AB4The XRD diffraction pattern of the type phase has a diffraction peak in the ranges of 2 theta = 31.46-31.54 degrees, 32.62-32.71 degrees, 35.95-36.04 degrees, 41.78-41.89 degrees, 42.60-42.71 degrees and 45.06-45.17 degrees, and the intensity ratio of six diffraction peaks is 26.6:9.2:37.7:29.2:100:20.7.
3. the superlattice hydrogen storage alloy according to claim 1 or 2, wherein AB is said AB4The La-Y-Ni based superlattice hydrogen storage alloy is single-phase AB4Type La0.5Y0.5Ni3.67Mn0.33Superlattice hydrogen-storage alloy or multiphase AB4Type La0.4Y0.6Ni3.67Mn0.33A superlattice hydrogen storage alloy.
4. The superlattice hydrogen storage alloy as recited in claim 3 wherein said single phase AB is selected from the group consisting of4Type La0.5Y0.5Ni3.67Mn0.33The maximum discharge capacity of the superlattice hydrogen storage alloy is 345.6mAh/g after 200 times of charge/discharge cyclesCapacity retention rate S20070.12%, discharge performance HRD at a current density of 600mA/g60084.03 percent; the multiphase AB4Type La0.4Y0.6Ni3.67Mn0.33The maximum discharge capacity of the superlattice hydrogen storage alloy is 312.8mAh/g, and the capacity retention rate S is 200 times of charge/discharge cycles20067.1%, high rate capability HRD at 600mA/g current density600The content was found to be 83.02%.
5. An AB as claimed in any one of claims 1 to 44The preparation method of the La-Y-Ni-based superlattice hydrogen storage alloy is characterized by comprising the following steps of:
(1) Selecting the corresponding metal elements as raw materials according to the alloy chemical composition of claim 1, compounding by adding an excess of 3% La, 1% Y and 5% Mn in consideration of volatilization loss of La, Y and Mn during melting to compensate for the burning loss, and then preparing alloy ingots by an arc melting method, each ingot being re-melted by being turned over 3 to 8 times in order to ensure uniformity of ingot composition;
(2) Sealing the alloy ingot obtained in the step (1) in a vacuum degree lower than 10-3A quartz tube in bar, then quenching: firstly, heating from room temperature to 600 ℃; then heating to 900 ℃, wherein the heating time of each temperature interval is 1.5h, and the heat preservation time of each temperature point is 1h; then continuously heating from 900 ℃ to 1050-1150 ℃ for 1h and preserving heat for 72h; finally water quenching is carried out to obtain AB4La-Y-Ni based superlattice hydrogen storage alloy.
6. AB4The application of the La-Y-Ni-based superlattice hydrogen storage alloy in a nickel-hydrogen electrode is characterized in that the AB is4The La-Y-Ni based superlattice hydrogen storage alloy is AB as defined in any one of claims 1 to 44Type La-Y-Ni based superlattice hydrogen storage alloy or AB as defined in claim 54AB prepared by preparation method of La-Y-Ni based superlattice hydrogen storage alloy4La-Y-Ni based superlattice hydrogen storage alloy.
7. A nickel-hydrogen electrode, characterized in that it is a nickel-hydrogen electrodeAB according to any of claims 1 to 44La-Y-Ni based superlattice hydrogen storage alloy or AB as defined in claim 54AB prepared by preparation method of La-Y-Ni-based superlattice hydrogen storage alloy4The La-Y-Ni based superlattice hydrogen storage alloy is prepared by the following specific steps of4Polishing the La-Y-Ni-based superlattice hydrogen storage alloy to remove a surface oxide layer, mechanically crushing the alloy in a glove box, grinding the crushed alloy into powder, sieving the powder by a 200-mesh sieve to obtain alloy powder, uniformly mixing the alloy powder and nickel powder, cold-pressing the mixture into an electrode plate with the diameter of 10mm under the pressure of 20MPa, coating the electrode plate in a foamed nickel substrate, and performing spot welding by using nickel strips to prepare the nickel-hydrogen electrode.
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