A high-hydrogen-storage-performance AB5 alloy, its preparation method and application

Abstract

The application relates to an AB5 type alloy with high hydrogen storage performance and a preparation method and application thereof. 0.6 Ni 3.45 Mg a Nd b ; wherein a=0.2-0.4, b=0.1-0.2. The preparation method comprises the following steps: (1) ingredients are prepared according to the formula, and then mixed materials are obtained by smelting in a vacuum arc furnace; (2) the mixed materials obtained in the step (1) are absorbed into a water-cooled copper mold by a vacuum suction casting method to obtain a rod-shaped alloy, namely the obtained alloy. The high hydrogen storage performance alloy provided by the application optimizes the alloy performance by adjusting the element ratio and changing the preparation process, significantly improves the effective hydrogen release amount, hydrogen absorption and release kinetics and hydrogen absorption rate, and has the advantages of simple and rapid preparation method, low preparation cost, large-scale production and application.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage alloy technology, specifically to an AB5 type alloy with high hydrogen storage performance, its preparation method, and its application. Background Technology

[0002] With the increasing global demand for clean and sustainable energy, hydrogen energy has attracted widespread attention as a promising clean energy solution. Hydrogen storage technology plays a crucial role in hydrogen energy applications, serving as a bridge between upstream hydrogen production and downstream hydrogen consumption. Among hydrogen storage technologies, AB5-type hydrogen storage alloys have become a research hotspot due to their advantages such as easy activation, good cycle stability, and low cost. However, their relatively low hydrogen storage density (approximately 1.4 wt%) limits their application in the hydrogen storage field. Therefore, further research and development are ongoing to improve the performance and application range of AB5-type hydrogen storage alloys. For example, CN115948678A discloses a method for preparing AB5-type hydrogen storage alloys and the application of Ce and Al elements. The chemical composition of this hydrogen storage alloy is La. x Ce y Ca z Ni a Al b Where x, y, z, a, and b represent the mole fractions of La, Ce, Ca, Ni, and Al, respectively. The following conditions must be met: 0.35 ≤ x ≤ 0.42, 0.35 ≤ y ≤ 0.5, 0.1 ≤ z ≤ 0.25, and x + y + z = 1; 4.8 ≤ a ≤ 4.95, 0.05 ≤ b ≤ 0.2, and 4.9 ≤ a + b ≤ 5.1. The method for preparing this alloy includes the following steps: melting the metal raw materials to obtain an alloy billet, and then annealing it under an inert atmosphere for 12–20 hours to obtain an AB5 type hydrogen storage alloy with a single CaCu5 structure, but does not involve the technique of rapidly solidifying the alloy through vacuum casting to improve hydrogen storage performance.

[0003] For example, CN113881872A discloses a method for preparing a hydrogen storage alloy with a CaCu5 structure as the main component using vacuum induction melting, with the general formula La. (1-x-y-z) Ce x Y y Zr z Ni a Co b Mn c Al dIn the formula, the numerical ranges of x, y, z, a, b, c, and d are: 0.2≤x≤0.4, 0.02≤y≤0.04, 0.02≤z≤0.04, 4.4≤a≤4.7, 0.1≤b≤0.3, 0.1≤c≤0.3, 0.2≤d≤0.4, and 5.0≤a+b+c+d≤5.3. The preparation method involves placing the prepared raw materials in a vacuum induction melting furnace for induction heating and melting; then, the hydrogen storage alloy is obtained by rapid cooling and spinning. This hydrogen storage alloy has a low hydrogen release plateau pressure and low hydrogen storage capacity. However, it does not involve suction casting or element substitution to adjust the lattice parameters of the alloy to improve hydrogen storage performance.

[0004] To address the problems faced by existing technologies, this invention provides an AB5-type alloy with high hydrogen storage performance. The hydrogen storage performance of the alloy is improved by controlling the lattice parameters and the proportion of the LaNi5 phase in the alloy through raw material ratio and element substitution, and by using vacuum casting to rapidly solidify the alloy and reduce crystal segregation. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides an AB5 type alloy with high hydrogen storage performance, its preparation method and application. The AB5 type alloy with high hydrogen storage performance provided by the present method has a high hydrogen storage capacity and a fast hydrogen absorption and desorption rate. The preparation process is simple and the preparation cost is low.

[0006] To achieve the objective, the present invention adopts the following technical solution:

[0007] One objective of this invention is to provide an AB5-type alloy with high hydrogen storage performance. The elemental composition of the AB5-type alloy with high hydrogen storage performance provided by this invention is La. 0.6 Ni 3.45 Mg a Nd b Where a = 0.2 - 0.4, b = 0.1 - 0.2.

[0008] The high hydrogen storage performance alloy provided by this invention optimizes the alloy performance by adjusting the element ratio and changing the preparation process, significantly improving the effective hydrogen release capacity, hydrogen absorption and desorption kinetics and hydrogen absorption rate. The preparation method is simple, fast and low in cost.

[0009] The AB5-type alloy with high hydrogen storage performance provided by this invention has an elemental composition of La. 0.6 Ni 3.45 Mg a Nd b ;

[0010] Where a = 0.2 - 0.4, b = 0.1 - 0.2.

[0011] The a value described in this invention is 0.2-0.4, for example, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, or 0.4, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0012] The value of b in this invention is 0.1-0.2, such as 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19 or 0.2, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0013] As a preferred embodiment of the present invention, the AB5-type alloy with high hydrogen storage performance provided by the present invention has an elemental composition of La. 0.6 Ni 3.45 Mg a Nd b ;

[0014] Where a = 0.25 - 0.3, b = 0.12 - 0.18.

[0015] The a value described in this invention is 0.25-0.3, such as 0.25, 0.26, 0.27, 0.28, 0.29 or 0.3, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0016] The value of b in this invention is 0.12-0.18, such as 0.12, 0.13, 0.14, 0.15, 0.16, 0.17 or 0.18, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0017] A second objective of this invention is to provide a method for preparing the AB5-type alloy with high hydrogen storage performance as described in the first objective, the method comprising the following steps:

[0018] (1) Batching: Weigh the elemental metals according to the atomic ratio and mix them to obtain a mixture;

[0019] (2) Smelting: The mixture described in step (1) is smelted to obtain alloy ingots;

[0020] (3) Crushing: The alloy ingots described in step (2) are crushed and screened, and about 2g of alloy ingots are taken out for suction casting;

[0021] (4) Vacuum casting: Vacuum casting is performed on the approximately 2g alloy ingot described in step (3) to obtain the hydrogen storage alloy.

[0022] The preparation method described in this invention is based on a specific atomic ratio for ingredient formulation. By adjusting the element ratio and changing the preparation process, the alloy properties are optimized, which significantly improves the effective hydrogen storage capacity, hydrogen absorption and desorption kinetics, and hydrogen absorption rate, making it suitable for any of the following applications: large-scale hydrogen energy storage, aerospace, hydrogen fuel cells, portable electronic devices, or hydrogen storage and transportation.

[0023] The purity of the elemental metal in step (1) of this invention is above 99.9%, including La, Mg, Ni and Nd.

[0024] The melting in step (2) of this invention is carried out under the protection of a protective gas, which can be a gas that does not react with the raw materials, such as nitrogen or an inert gas. After melting, the alloy is allowed to cool to room temperature with the copper crucible, then turned over and melted again.

[0025] As a preferred technical solution of the present invention, the current in the melting process in step (2) is 140-240A, such as 140A, 150A, 160A, 170A, 180A, 190A, 200A, 210A or 220A, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable, preferably 160-220A.

[0026] Preferably, the single melting time in step (2) is 120-240s, such as 120s, 130s, 140s, 150s, 160s, 170s, 180s, 190s, 200s, 210s, 220s, 230s or 240s, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable, preferably 120-180s.

[0027] Preferably, the melting process in step (2) involves 3-6 melting cycles, and more preferably 4-5 melting cycles.

[0028] Preferably, the melting in step (2) is carried out in a vacuum electric arc furnace or a vacuum induction melting furnace.

[0029] As a preferred technical solution of the present invention, the alloy ingot in step (2) includes the LaNi5 phase.

[0030] As a preferred technical solution of the present invention, the average particle size of the AB5 alloy with high hydrogen storage performance obtained by sieving in step (3) is 0.4-0.6 cm, for example 0.4 cm, 0.45 cm, 0.5 cm, 0.55 cm, or 0.6 cm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0031] As a preferred technical solution of the present invention, the current in the vacuum casting in step (4) is 90-140A, for example, it can be 90A, 95A, 100A, 105A, 110A, 115A, 120A, 125A, 130A, 135A or 140A, but is not limited to the listed values. Other unlisted values ​​in this range are also applicable, preferably 100-120A.

[0032] Preferably, the vacuum casting time in step (4) is 8-20s, for example, it can be 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s or 20s, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable, preferably 10-15s.

[0033] The preparation method includes the following steps:

[0034] (1) Batching: Weigh the elemental metals according to the atomic ratio and mix them to obtain a mixture;

[0035] (2) Melting: The mixture described in step (1) is melted. The current during melting is 140-240A, the melting time is 160-220s, and the melting is repeated 3-6 times to obtain alloy ingots.

[0036] The alloy ingot includes the LaNi5 phase;

[0037] (3) Crushing: The alloy ingots described in step (2) are crushed and screened to obtain an average particle size of 0.4-0.6 cm. Approximately 2 g of alloy ingots are taken.

[0038] (4) Vacuum casting: The alloy ingots described in step (3) are vacuum cast sequentially to obtain the hydrogen storage alloy;

[0039] A third objective of this invention is to provide an application of the AB5 alloy with high hydrogen storage performance described in one objective, and to use the AB5 alloy with high hydrogen storage performance in any one of large-scale hydrogen energy storage, aerospace, hydrogen fuel cells, portable electronic devices, and hydrogen storage and transportation.

[0040] Preferably, the AB5 alloy with high hydrogen storage performance is used in fuel cells and / or hydrogen energy storage.

[0041] Compared with existing technical solutions, the present invention has at least the following beneficial effects:

[0042] (1) The AB5 alloy with high hydrogen storage performance described in this invention has good performance. The maximum hydrogen absorption at room temperature can reach more than 1.70 wt%, and the maximum hydrogen release at room temperature can reach more than 1.50 wt%. It is simple to prepare and has a relatively low cost.

[0043] (2) The preparation method described in this invention is based on a specific atomic ratio for ingredient formulation. By adjusting the element ratio and changing the preparation process, the alloy properties are optimized, significantly improving the effective hydrogen storage capacity, hydrogen absorption and desorption kinetics, and hydrogen absorption rate. The preparation method is simple, rapid, and low in cost. It has broad application prospects in large-scale hydrogen energy storage, aerospace, hydrogen fuel cells, portable electronic devices, and hydrogen storage and transportation. Attached Figure Description

[0044] Figure 1 These are the XRD patterns of the hydrogen storage alloys described in Examples 1-4 of this invention;

[0045] Figure 2 These are the hydrogen absorption kinetic curves of the hydrogen storage alloy described in Embodiment 1 and Comparative Example 1 of the present invention;

[0046] Figure 3 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Embodiment 1 of the present invention;

[0047] Figure 4 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Embodiment 1 of the present invention;

[0048] Figure 5 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Embodiment 2 of the present invention;

[0049] Figure 6 This is the hydrogen desorption kinetics curve of the hydrogen storage alloy described in Example 2 of the present invention;

[0050] Figure 7 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Example 3 of the present invention;

[0051] Figure 8 This is the hydrogen desorption kinetics curve of the hydrogen storage alloy described in Example 3 of the present invention;

[0052] Figure 9 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Example 4 of the present invention;

[0053] Figure 10 This is the hydrogen desorption kinetics curve of the hydrogen storage alloy described in Example 4 of the present invention;

[0054] Figure 11 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Comparative Example 1 of the present invention;

[0055] Figure 12 This is the hydrogen desorption kinetics curve of the hydrogen storage alloy described in Comparative Example 1 of the present invention;

[0056] Figure 13 This is the hydrogen absorption kinetics curve of the hydrogen storage alloy described in Comparative Example 2 of the present invention;

[0057] Figure 14 This is the hydrogen desorption kinetics curve of the hydrogen storage alloy described in Comparative Example 2 of the present invention; Detailed Implementation

[0058] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0059] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0060] Example 1

[0061] This embodiment provides an AB5-type alloy with high hydrogen storage performance, wherein the elemental composition of the AB5-type alloy with high hydrogen storage performance is La. 0.6 Ni 3.45 Mg 0.3 Nd 0.1 ;

[0062] It is prepared using the following method:

[0063] (1) Batching: Weigh out elemental metals with a purity of ≥99.9% according to atomic ratio and mix them to obtain a mixture;

[0064] (2) Melting: The mixture described in step (1) is loaded into a water-cooled copper mold of a non-consumable vacuum arc furnace, and then placed in a vacuum arc furnace for melting under the protection of argon. The current in the melting is 180A, and the melting time is 120s. After the melting, the alloy is allowed to cool to room temperature with the copper crucible, then turned over and a new melting is carried out. The melting is repeated 4 times to obtain alloy ingots.

[0065] The alloy ingot includes the LaNi5 phase;

[0066] (3) Crushing: The alloy ingots described in step (2) are crushed and screened to obtain alloy particles with an average particle size of 0.5 cm.

[0067] (4) Vacuum casting: The alloy particles described in step (3) are vacuum cast. The current of vacuum casting is 110A and the time is 12s to obtain the alloy.

[0068] In this embodiment, the suction-cast alloy was ground into powder, and the phase structure of the alloy powder was analyzed by XRD. The XRD pattern of the AB5 alloy with high hydrogen storage performance is shown below. Figure 1 As shown, it was confirmed to be the LaNi5 phase. The sample was placed in a stainless steel reaction vessel, and hydrogen gas at 8 MPa was introduced. Complete activation was achieved by repeating hydrogen absorption and desorption once. Finally, the hydrogen absorption and desorption kinetics were analyzed at 25 °C. The hydrogen absorption kinetic curve is shown in the figure. Figure 2 and Figure 3As shown ("(a)" represents "first hydrogen absorption", "(b)" represents "second hydrogen absorption", and "(c)" represents "third hydrogen absorption"), the hydrogen release kinetic curve is as follows: Figure 4 As shown ("(a)" represents "first hydrogen release", "(b)" represents "second hydrogen release", "(c)" represents "third hydrogen release"), the maximum hydrogen absorption for the first hydrogen absorption is 1.70 wt%, and the effective hydrogen release is 1.41 wt%. The maximum hydrogen absorption for the second hydrogen absorption is 1.72 wt%, and the effective hydrogen release is 1.48 wt%. The maximum hydrogen absorption for the third hydrogen absorption is 1.68 wt%, and the effective hydrogen release is 1.52 wt%.

[0069] Example 2

[0070] This embodiment provides an AB5-type alloy with high hydrogen storage performance, wherein the elemental composition of the AB5-type alloy with high hydrogen storage performance is La. 0.6 Ni 3.45 Mg 0.3 Nd 0.15 That is, change "b=0.1" in Example 1 to "b=0.15", and keep all other conditions exactly the same as in Example 1.

[0071] The XRD pattern of the high hydrogen storage performance AB5 alloy described in this embodiment is as follows: Figure 1 As shown, it was confirmed to be the LaNi5 phase. The sample was placed in a stainless steel reaction vessel, and hydrogen gas at 8 MPa was introduced. Complete activation was achieved by repeating hydrogen absorption and desorption once. Finally, the hydrogen absorption and desorption kinetics were analyzed at 25 °C. The hydrogen absorption kinetic curve is shown in the figure. Figure 5 As shown ("(a)" represents "first hydrogen absorption", "(b)" represents "second hydrogen absorption", and "(c)" represents "third hydrogen absorption"), the hydrogen release kinetic curve is as follows: Figure 6 As shown ("(a)" represents "first hydrogen release", "(b)" represents "second hydrogen release", "(c)" represents "third hydrogen release"), the maximum hydrogen absorption for the first hydrogen absorption is 1.61 wt%, and the effective hydrogen release is 1.26 wt%. The maximum hydrogen absorption for the second hydrogen absorption is 1.61 wt%, and the effective hydrogen release is 1.38 wt%. The maximum hydrogen absorption for the third hydrogen absorption is 1.63 wt%, and the effective hydrogen release is 1.41 wt%.

[0072] Example 3

[0073] This embodiment provides an AB5-type alloy with high hydrogen storage performance, wherein the elemental composition of the AB5-type alloy with high hydrogen storage performance is La. 0.6 Ni 3.45 Mg 0.35 Nd 0.15That is, in Example 1, "a = 0.3" is changed to "a = 0.35" and "b = 0.1" is changed to "b = 0.15", and other conditions are exactly the same as in Example 1.

[0074] The XRD pattern of the high hydrogen storage performance AB5 alloy described in this embodiment is as follows: Figure 1 As shown, it was confirmed to be the LaNi5 phase. The sample was placed in a stainless steel reaction vessel, and hydrogen gas at 8 MPa was introduced. Complete activation was achieved by repeating hydrogen absorption and desorption once. Finally, the hydrogen absorption and desorption kinetics were analyzed at 25 °C. The hydrogen absorption kinetic curve is shown in the figure. Figure 7 As shown ("(a)" represents "first hydrogen absorption", "(b)" represents "second hydrogen absorption", and "(c)" represents "third hydrogen absorption"), the hydrogen release kinetic curve is as follows: Figure 8 As shown ("(a)" represents "first hydrogen release", "(b)" represents "second hydrogen release", "(c)" represents "third hydrogen release"), the maximum hydrogen absorption for the first hydrogen absorption is 1.62 wt%, and the effective hydrogen release is 1.24 wt%. The maximum hydrogen absorption for the second hydrogen absorption is 1.61 wt%, and the effective hydrogen release is 1.34 wt%. The maximum hydrogen absorption for the third hydrogen absorption is 1.54 wt%, and the effective hydrogen release is 1.38 wt%.

[0075] Example 4

[0076] This embodiment provides an AB5-type alloy with high hydrogen storage performance, wherein the elemental composition of the AB5-type alloy with high hydrogen storage performance is La. 0.6 Ni 3.45 Mg 0.4 Nd 0.15 That is, in Example 1, "a = 0.3" is changed to "a = 0.4" and "b = 0.1" is changed to "b = 0.15", and other conditions are exactly the same as in Example 1.

[0077] The XRD pattern of the high hydrogen storage performance AB5 alloy described in this embodiment is as follows: Figure 1 As shown, it was confirmed to be the LaNi5 phase. The sample was placed in a stainless steel reaction vessel, and hydrogen gas at 8 MPa was introduced. Complete activation was achieved by repeating hydrogen absorption and desorption once. Finally, the hydrogen absorption and desorption kinetics were analyzed at 25 °C. The hydrogen absorption kinetic curve is shown in the figure. Figure 9 As shown ("(a)" represents "first hydrogen absorption", "(b)" represents "second hydrogen absorption", and "(c)" represents "third hydrogen absorption"), the hydrogen release kinetic curve is as follows: Figure 10As shown ("(a)" represents "first hydrogen release", "(b)" represents "second hydrogen release", "(c)" represents "third hydrogen release"), the maximum hydrogen absorption for the first hydrogen absorption is 1.58 wt%, and the effective hydrogen release is 1.24 wt%. The maximum hydrogen absorption for the second hydrogen absorption is 1.60 wt%, and the effective hydrogen release is 1.35 wt%. The maximum hydrogen absorption for the third hydrogen absorption is 1.65 wt%, and the effective hydrogen release is 1.36 wt%.

[0078] Comparative Example 1

[0079] This comparative example provides an AB5 hydrogen storage alloy, the elemental composition of which is La. 0.6 Ni 3.45 Mg 0.3 Nd 0.1 The only difference from Example 1 is that vacuum casting is not performed.

[0080] The alloy described in this comparative example was placed in a stainless steel reaction vessel, and hydrogen gas at 8 MPa was introduced. Complete activation was achieved by repeating hydrogen absorption and desorption once. Finally, the hydrogen absorption and desorption kinetics were tested at 25°C, and the hydrogen absorption kinetic curve is shown below. Figure 11 As shown ("(a)" represents "first hydrogen absorption", "(b)" represents "second hydrogen absorption", and "(c)" represents "third hydrogen absorption"), the hydrogen release kinetic curve is as follows: Figure 2 and Figure 12 As shown ("(a)" represents "first hydrogen release", "(b)" represents "second hydrogen release", "(c)" represents "third hydrogen release"), the maximum hydrogen absorption for the first hydrogen absorption is 1.59 wt%, and the effective hydrogen release is 1.16 wt%; the maximum hydrogen absorption for the second hydrogen absorption is 1.38 wt%, and the effective hydrogen release is 1.19 wt%; and the maximum hydrogen absorption for the third hydrogen absorption is 1.58 wt%, and the effective hydrogen release is 1.27 wt%.

[0081] Comparative Example 2

[0082] This comparative example provides an AB5 hydrogen storage alloy, the elemental composition of which is La. 0.6 Ni 3.45 Mg 0.3 The only difference from Example 1 is that the Nd element is not added.

[0083] The alloy described in this comparative example was placed in a stainless steel reaction vessel, and hydrogen gas at 8 MPa was introduced. Complete activation was achieved by repeating hydrogen absorption and desorption once. Finally, the hydrogen absorption and desorption kinetics were tested at 25°C, and the hydrogen absorption kinetic curve is shown below. Figure 13 As shown ("(a)" represents "first hydrogen absorption", "(b)" represents "second hydrogen absorption"), the hydrogen release kinetic curve is as follows: Figure 14As shown ("(a)" represents "first hydrogen release", "(b)" represents "second hydrogen release"), the maximum hydrogen absorption capacity of the first hydrogen absorption is 1.45 wt%, and the effective hydrogen release capacity is 1.21 wt%. The maximum hydrogen absorption capacity of the second hydrogen absorption is 1.40 wt%, and the effective hydrogen release capacity is 1.21 wt%.

[0084] As can be seen from the above embodiments and comparative results, the hydrogen storage alloy provided by the present invention employs specific raw material ratios and preparation processes. By adjusting the element ratios and changing the preparation process, the alloy performance is optimized, significantly improving the effective hydrogen release capacity and hydrogen absorption / desorption kinetics. The preparation method is simple, rapid, and low in cost. The high-hydrogen-storage-performance AB5 alloy is applicable to large-scale hydrogen energy storage, aerospace, hydrogen fuel cells, portable electronic devices, and hydrogen storage and transportation, providing a safe and efficient solid-state hydrogen source for fuel cells.

[0085] The applicant hereby declares that the above embodiments are only used to illustrate the structural features of the present invention in detail, but do not limit the present invention to be implemented solely based on these specific structural features. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of selected components, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0086] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited to the specific details of the above embodiments. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, and all such simple modifications fall within the protection scope of the present invention.

[0087] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner, provided that they are not contradictory. To avoid repetition, this invention will not describe various possible combinations separately.

[0088] Furthermore, various embodiments of the present invention can be combined arbitrarily, and as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An AB5-type alloy with high hydrogen storage performance, characterized in that, The elemental composition of the high hydrogen storage capacity AB5 alloy is La0.6Ni3.45MgaNdb; where a=0.2-0.4, b=0.1-0.2; Its preparation method includes the following steps: (1) Batching: Weigh the elemental metals according to the atomic ratio and mix them to obtain a mixture; (2) Melting: The mixture described in step (1) is melted. The current during melting is 140-240A, the melting time is 140-240s, and the melting is repeated 3-6 times to obtain an alloy ingot. The alloy ingot includes the LaNi5 phase. (3) Crushing: The alloy ingots described in step (2) are crushed and screened, and the alloy ingots are taken out for suction casting; (4) Vacuum casting: The alloy ingots described in step (3) are vacuum cast. The current in the vacuum casting is 90-140A to obtain the hydrogen storage alloy.

2. The AB5 type alloy with high hydrogen storage performance according to claim 1, characterized in that, The current during the smelting process in step (2) is 160-220A.

3. The AB5 type alloy with high hydrogen storage performance according to claim 1, characterized in that, Step (3) involves sieving to obtain AB5 alloy with high hydrogen storage performance, with an average particle size of 0.4-0.6 cm.

4. The AB5 type alloy with high hydrogen storage performance according to claim 1, characterized in that, The current in the vacuum casting process described in step (4) is 100-120A.

5. The application of the AB5 type alloy with high hydrogen storage performance as described in claim 1, characterized in that, The AB5 alloy with high hydrogen storage performance can be used in any of the following applications: large-scale hydrogen energy storage, aerospace, hydrogen fuel cells, portable electronic devices, or hydrogen storage and transportation.

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