Preparation process of wide-temperature energy storage type hydrogen storage material

Abstract

The application discloses a kind of wide temperature energy storage type hydrogen storage material preparation process, it is related to hydrogen storage material preparation field, comprising: S1, raw material pretreatment;S2, magnetic doping and composition design;S3, magnetic field assisted mechanical alloying;S4, magnetic crystallization treatment;S5, magnetron sputtering coating;S6, magnetic polishing treatment;The present application is through the deep integration of magnetic material crystallization treatment and hydrogen storage alloy preparation process, systematically solves the core problems such as traditional hydrogen storage material temperature adaptability, dynamics slow, short cycle life, provides the revolutionary material solution scheme with high energy density, fast response, high safety, long life for low-altitude economy unmanned aerial vehicle and wide temperature energy storage field, with significant technical advancement and broad market application prospect.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydrogen storage material preparation, and in particular to a wide-temperature energy storage type hydrogen storage material preparation process. BACKGROUND

[0002] With the rapid development of low-altitude economy, unmanned aerial vehicles (UAVs) are increasingly widely used in fields such as logistics distribution, emergency rescue and military reconnaissance. However, the existing UAVs generally use lithium batteries as power sources, and have problems such as low energy density (<300 Wh / kg), poor low-temperature performance (capacity attenuation >50% at -20℃), and short endurance time (usually <2 hours), which seriously limit the operation radius and task capability of the UAVs.

[0003] Hydrogen storage materials are considered to be an ideal choice for the next generation of energy systems due to their high theoretical energy density (hydrogen 120 kJ / g, about 3 times that of gasoline) and environmental friendliness. Metal hydride hydrogen storage alloys (such as Mg2Ni, TiFe, LaNi5, etc.) have high hydrogen storage capacity, but have the following technical difficulties: 1. Poor temperature adaptability: traditional hydrogen storage alloys have a sharp deterioration in hydrogen absorption and desorption kinetics below 0℃, and have problems such as high hydrogen desorption plateau pressure and decreased cycle stability above 80℃, which makes it difficult to meet the all-weather (-40℃~80℃) flight requirements of UAVs; 2. Slow hydrogen absorption and desorption rate: the bulk diffusion resistance is large, and the hydrogen atom migration activation energy in the alloy is high (usually >50 kJ / mol), resulting in a long hydrogen absorption time of tens of minutes, which cannot meet the rapid hydrogen charging response requirements of UAVs; 3. Insufficient cycle life: repeated hydrogen absorption and desorption causes lattice expansion and contraction (volume change rate >10%), which leads to alloy pulverization and capacity attenuation, and the capacity retention rate is <80% after 50 cycles; 4. Lack of interface engineering: the thin film deposition in the early stage (<10 nm) is easily affected by high-energy ion bombardment, forming interface defects and affecting device performance, and the traditional sputtering system lacks effective ion suppression means.

[0004] Although some progress has been made in recent years through means such as nanocrystallization, surface catalysis and alloying, the existing technology mainly has the following deficiencies: First, although simple mechanical ball milling can refine the grain size, impurities and oxidation are easily introduced, and grain growth is difficult to inhibit; Second, surface plating technologies (such as chemical plating and sputtering plating) have poor uniformity, high cost and weak bonding force with the substrate; Third, magnetic field treatment is mainly used for magnetic materials, and its application in hydrogen storage alloys lacks systematic research, and the mechanism of magnetic-hydrogen synergistic regulation is not clear; Fourth, there is a lack of special hydrogen storage material preparation processes for low-altitude UAVs and wide-temperature energy storage battery application scenarios.

[0005] To address these issues, we provide a process for preparing wide-temperature energy storage hydrogen storage materials. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a process for preparing wide-temperature energy storage hydrogen storage materials. By deeply integrating magnetic material crystallization treatment with hydrogen storage alloy preparation technology, this invention systematically solves the core problems of traditional hydrogen storage materials, such as poor temperature adaptability, slow kinetics, and short cycle life. It provides a revolutionary material solution for low-altitude economic drones and wide-temperature energy storage fields, which combines high energy density, fast response, high safety, and long life, and has significant technological advancements and broad market application prospects.

[0007] To achieve the above objectives, the present invention employs a wide-temperature energy storage type hydrogen storage material preparation process, comprising the following steps: S1, Raw material pretreatment: Select magnesium powder, nickel powder and iron powder with a purity of ≥99.9%. Pre-treat magnesium powder by ball milling under argon protection, with a ball-to-material ratio of 15:1, a rotation speed of 300 rpm and a time of 2 hours; reduce nickel powder and iron powder in a hydrogen atmosphere at 400℃ for 2 hours. S2, Magnetic Doping and Composition Design: Based on Stoichiometry of Mg 0.80 Ni 0.15 Fe 0.05 Prepare the raw materials, add 2wt% graphene nanosheets and 0.5wt% TiH2, and mix in an argon-protected glove box for 30 min; S3, Magnetic field-assisted mechanical alloying: The mixed raw materials are loaded into a stainless steel ball mill jar with a ball-to-material ratio of 20:1. 10mm, 6mm and 3mm hard alloy balls are used. The ball milling is carried out in a planetary ball mill with a main disc speed of 350rpm, a rotation-to-revolution ratio of 2:1, intermittent operation, and a total ball milling time of 50h. 0.5MPa hydrogen gas is introduced into the jar to achieve in-situ hydrogenation. S4, Magnetic crystallization treatment: The ball-milled powder is loaded into a quartz tube, vacuum sealed, and placed in a magnetic field heat treatment furnace for secondary crystallization treatment. Level 1: Keep warm at 220℃ for 4 hours, and apply a 2T steady magnetic field; Second stage: Keep warm at 350℃ for 6 hours, and apply a 5T steady magnetic field; S5, Magnetron sputtering coating: Depositing a 5-10 nm thick Fe coating on the surface of crystallized powder. 0.40 Co 0.30 Ni 0.30 Magnetic thin film, sputtering power 80W, Ar gas pressure 0.5Pa, substrate bias -50V, time 3min; S6, Magnetic polishing treatment: Place the coating powder in a magnetic polishing device, use 1mm diameter zirconia balls as the medium, the ball-to-powder ratio is 3:1, and the polishing time is 2 hours.

[0008] As a further optimization of the above scheme, the particle sizes of the magnesium powder, nickel powder and iron powder are ≤50μm, ≤10μm and ≤5μm, respectively.

[0009] As a further optimization of the above scheme, the mass ratio of 10mm, 6mm and 3mm cemented carbide balls in the S3 magnetic field-assisted mechanical alloying is 3:5:2; When running intermittently, the ball mill is stopped for 10 minutes after 30 minutes.

[0010] As a further optimization of the above scheme, the magnesium powder is pretreated and then dried in a vacuum drying oven at 150°C for 4 hours during the processing of raw material S1, with a vacuum degree ≤10-2Pa.

[0011] As a further optimization of the above scheme, a Helmholtz coil structure is arranged outside the ball mill in the S3 magnetic field-assisted mechanical alloying process. The coil diameter is 300mm, the number of turns is 500, and the alternating magnetic field frequency is 50Hz with an intensity of 0.5T.

[0012] As a further optimization of the above scheme, in S5, the magnetron sputtering coating uses an Fe0.40Co0.30Ni0.30 alloy target, and a 0.2T parallel magnetic field is applied during the sputtering process to induce magnetic anisotropy.

[0013] As a further optimization of the above scheme, the magnetic polishing device in the magnetic polishing process adopts a 100Hz, 0.3T alternating magnetic field. After polishing, the sphericity of the powder increases from 0.75 to 0.92, and the surface roughness Ra decreases from 150nm to 30nm.

[0014] This invention also provides an application of a wide-temperature energy storage hydrogen storage material preparation process, which is applied to the manufacture of fuel cells for low-altitude unmanned aerial vehicles or wide-temperature energy storage batteries.

[0015] The present invention provides a process for preparing a wide-temperature energy storage hydrogen storage material, which has the following beneficial effects: This invention discloses a wide-temperature energy storage hydrogen storage material preparation process, which achieves ultra-fine grain size and good structural stability. Through magnetic field-assisted mechanical alloying and secondary crystallization treatment, the grain size of the hydrogen storage alloy is refined from >80nm in traditional processes to 30-50nm, a refinement of more than 50%. The magnetic field-induced magnetocrystalline anisotropy effectively suppresses grain growth, and the nanocrystalline structure shows no significant coarsening after being held at 200℃ for 100h, exhibiting excellent thermal stability. The core-shell structure design (Mg2Ni@FeCoNi) enhances the alloy's ability to buffer volume changes during hydrogen absorption and desorption cycles, with a capacity retention rate of >95% after 1000 cycles, which is 20-30 percentage points higher than that of traditional alloys. Breakthrough in wide-temperature hydrogen storage performance; maintaining 4.2wt% hydrogen absorption capacity at -40℃ with a hydrogen absorption time of only 300 seconds, 50% shorter than unmagnetized alloys; achieving 5.9wt% hydrogen release capacity at 80℃ with a controllable hydrogen release plateau pressure below 0.82MPa, avoiding high-temperature and high-pressure safety risks; achieving effective operation within a wide temperature range of -40℃ to 80℃, meeting the stringent requirements of all-weather drone flight and wide-temperature energy storage batteries; low-temperature capacity retention >70%, solving the problem of rapid performance degradation of traditional materials below 0℃; The kinetic performance is significantly improved; the magnetic field promotes element diffusion and surface catalytic activity, increasing the hydrogen absorption rate from 45 mL / g·min to 158 mL / g·min, an increase of 252%; the hydrogen release activation energy is reduced from 58.2 kJ / mol to 38.4 kJ / mol, and the hydrogen atom diffusion coefficient is increased by 3-5 times; the initial activation cycle is reduced from the traditional 8-10 times to 1-3 times, significantly shortening the material's start-up time. Enhanced magneto-hydrogen synergy; the introduction of Fe, Co, and Ni magnetic elements increases the alloy's saturation magnetization to 25-45 emu / g, and the magnetocaloric effect (MCE) generates a local temperature rise in the phase transition region, accelerating hydrogen molecule dissociation; the magnetic coating acts as a micro-magnetic field source, guiding hydrogen atoms to diffuse rapidly along the magnetic field gradient, forming "magnetic hydrogen channels"; the Ni-rich surface layer formed by magnetopolishing provides high-density catalytic active sites, reducing the hydrogen molecule dissociation energy barrier by 30%; As a negative electrode material for solid-state hydrogen storage batteries, it has a discharge capacity of 620mAh / g at -40℃, a capacity retention rate of 78%, and a coulombic efficiency of 95.2%, solving the problem of low-temperature failure in traditional batteries.

[0016] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope as a result, and that the embodiments of the present invention include many changes, modifications and equivalents within the spirit and scope of the appended claims. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the preparation process of the wide-temperature energy storage hydrogen storage material of the present invention. Detailed Implementation

[0018] Please refer to the instruction manual appendix. Figure 1 This invention provides a technical solution: a wide-temperature energy storage hydrogen storage material preparation process. By deeply integrating magnetic material crystallization treatment with hydrogen storage alloy preparation process, this invention systematically solves the core problems of traditional hydrogen storage materials, such as poor temperature adaptability, slow kinetics, and short cycle life. It provides a revolutionary material solution for low-altitude economic drones and wide-temperature energy storage fields, which has high energy density, fast response, high safety, and long life. It has significant technological advancement and broad market application prospects.

[0019] This invention specifically discloses a magnetic field-assisted mechanical alloying preparation process for magnesium-based magnetic nanocrystalline hydrogen storage alloys. This embodiment discloses a Mg 1-x Ni x Fe y The preparation process of hydrogen storage alloy, where x=0.15-0.25, y=0.02-0.05, Mg is magnesium, Ni is nickel, and Fe is iron, achieves precise control of nanocrystalline structure by introducing Fe magnetic element and applying alternating magnetic field during mechanical alloying, thereby obtaining hydrogen storage material with high hydrogen absorption and desorption kinetics performance in a wide temperature range of -40℃ to 80℃.

[0020] Step 1: Raw material preparation and pretreatment; Magnesium powder (particle size ≤ 50 μm), nickel powder (particle size ≤ 10 μm), and iron powder (particle size ≤ 5 μm) with a purity ≥ 99.9% were selected as raw materials. First, the magnesium powder was pre-treated by ball milling in an argon-protected glove box with a ball-to-particle ratio of 15:1, a rotation speed of 300 rpm, and a time of 2 hours to remove the oxide layer on the surface of the magnesium powder and activate the surface. The pre-treated magnesium powder then needed to be dried in a vacuum drying oven at 150℃ for 4 hours with a vacuum degree ≤ 10. -2 Pa, nickel powder and iron powder were reduced at 400℃ for 2 hours in a hydrogen atmosphere with a hydrogen flow rate of 50 mL / min to remove surface oxides.

[0021] The second step is magnetic doping and composition design. According to stoichiometry Mg 0.80 Ni 0.15 Fe 0.05 The raw materials were prepared in a total mass of 200g. To improve the overall performance of the alloy, 2WT% of graphene nanosheets (thickness ≤5nm, sheet diameter 1-5μm) were added as a conductive additive, and 0.5WT% of Tih2 was added as a grain refiner. All raw materials were mixed in an argon-protected glove box for 30min. The argon purity was ≥99.999%, and the water and oxygen content was ≤0.1ppm.

[0022] The third step is magnetic field-assisted mechanical alloying; The mixed raw materials are loaded into a 500mL stainless steel ball mill jar with a ball-to-material ratio of 20:1. The grinding balls are cemented carbide balls with diameters of 10mm, 6mm and 3mm respectively, with a mass ratio of 3:5:2. After sealing, the ball mill jar is installed in a planetary ball mill, and an electromagnetic coil system is arranged outside the ball mill.

[0023] Magnetic field device design: A Helmholtz coil structure is adopted, with a coil diameter of 300mm and 500 turns. An alternating magnetic field with a frequency of 50Hz and an intensity of 0.5T is introduced. The direction of the magnetic field is perpendicular to the rotation axis of the ball mill jar to generate Lorentz force to promote powder mixing.

[0024] Ball milling process parameters: main disc speed 350 rpm, rotation-to-revolution ratio 2:1, ball milling process is intermittent, stop for 10 minutes to cool down after every 30 minutes of ball milling, total ball milling time is 50 hours, hydrogen gas with a purity of 99.999% is introduced into the tank at 0.5 MPa during ball milling to achieve in-situ hydrogenation reaction, alternating magnetic field is applied throughout the ball milling process, and element diffusion and nanocrystal formation are promoted through the magnetostrictive effect induced by the magnetic field.

[0025] The fourth step is magnetic crystallization treatment; The alloy powder (particle size ≤ 5μm) obtained by ball milling is loaded into a quartz tube, vacuum sealed, and then placed in a magnetic field heat treatment furnace for secondary crystallization treatment. The magnetic field heat treatment furnace is equipped with a superconducting magnet, which can generate a stable magnetic field with an intensity of up to 9T.

[0026] First-stage crystallization: Temperature 220℃, hold for 4 hours, apply a 2T magnetic field with the direction of the magnetic field parallel to the direction of powder compaction. This stage promotes the transformation of the amorphous phase to the nanocrystalline phase, forming Mg2Ni, MgNi2 and Fe3Ni2 magnetic phases with grain size controlled at 10-20nm. The heating rate is 5℃ / min. The application of the magnetic field inhibits grain growth and at the same time causes the magnetic phases to align along the direction of the magnetic field.

[0027] Second-stage crystallization: Temperature 350℃, hold for 6 hours, apply 5T magnetic field. In this stage, the deep diffusion of alloying elements and phase structure optimization are completed, forming a composite phase with a core-shell structure. Among them, Mg2Ni is the main hydrogen storage phase and Fe3Ni2 is the magnetic catalytic phase. The grain size is finally controlled at 30-50nm. The magnetic field-induced magnetocrystalline anisotropy significantly improves the thermal stability of nanocrystals.

[0028] Step 5: Magnetron sputtering coating and surface modification; The crystallized alloy powder is deposited with a 5-10 nm thick FeCoNi magnetic film on its surface by magnetron sputtering technology to further enhance the surface catalytic activity and anti-pulverization ability.

[0029] Sputtering parameters: using Fe 0.40 Co 0.30 Ni 0.30 Alloy target, sputtering power 80W, Ar gas pressure 0.5Pa, substrate bias -50V, sputtering time 3min, target and powder distance 80mm, the powder is uniformly fluidized in the sputtering cavity by a vibration device, a 0.2T parallel magnetic field is applied during the sputtering process to induce thin film magnetic anisotropy.

[0030] Step 6: Magnetic polishing. The coated powder is placed in a magnetic polishing device, which consists of an alternating magnetic field generator and a stainless steel polishing tank. The magnetic field frequency is 100 Hz and the intensity is 0.3 T. The polishing medium is zirconia balls with a diameter of 1 mm, the ball-to-powder ratio is 3:1, and the polishing time is 2 hours.

[0031] During the magnetic polishing process, the magnetic powder collides and rubs against the grinding ball under the drive of an alternating magnetic field, effectively removing surface burrs and microcracks. The sphericity of the powder increases from 0.75 to 0.92, and the surface roughness Ra decreases from 150 nm to 30 nm. At the same time, the magnetic field induces the rearrangement of surface atoms to form a Ni-rich catalytic layer, which significantly improves the hydrogen absorption and desorption kinetics.

[0032] Step 7: Performance testing and characterization; Microstructure characterization: XRD analysis of the alloy showed that the main phase was Mg2Ni and the secondary phase was Fe3Ni2. The grain size was calculated to be 35 nm using the Scherrer formula. Transmission electron microscopy (TEM) shows that the powder has a core-shell structure, with the core region being a Mg2Ni hydrogen storage phase and the shell being a 5-8 nm FeCoNi magnetic thin film. Mössbauer spectroscopy analysis showed that the Fe ion was in the +2 valence in the crystal lattice and exhibited ferromagnetism with a saturation magnetization Ms = 25 emu / g; Hydrogen storage performance test: The test was conducted on a SieVerT hydrogen storage tester with a sample mass of 2g. The activation conditions were 300℃ and 4MPa hydrogen pressure, and the test was repeated 3 times.

[0033] Table 1: Hydrogen storage performance data of the alloy in Example 1 at different temperatures

[0034] Table 2: Comparison of the effects of magnetic treatment on alloy properties

[0035] Step 8: Low-altitude drone application testing; The prepared hydrogen storage alloy powder was mixed with 1 wt% polytetrafluoroethylene (PTFE) binder, and a cylindrical hydrogen storage device with a diameter of 50 mm, a thickness of 8 mm, and a volume of 15.7 cm³ was prepared by cold pressing. 3 Weighing 35g, the device is integrated into the battery compartment of a low-altitude drone.

[0036] Hydrogen storage device performance: Hydrogen storage capacity: 6.1WT% × 35g = 2.14gh2 ≈ 71.3LSTP hydrogen; Energy density: 2.14g×120kJ / g÷0.035kg=7.34kWh / kg (considering a 60% fuel cell conversion efficiency, the actual effective energy density is 4.4kWh / kg). Operating temperature range: -40℃~80℃, meeting the all-weather flight requirements of UAVs; Drone flight test: At an altitude of 2000m and an ambient temperature of -20℃, the drone equipped with this hydrogen storage device (with a 500W fuel cell) achieved continuous flight for 8.5 hours, which is 240% longer than the traditional lithium battery (2.5 hours).

[0037] Table 3: Measured data on the wide-temperature performance of hydrogen storage devices on UAVs

[0038] Step 9: Application of wide-temperature energy storage batteries; Hydrogen storage alloy powder was mixed with 5 WT of copper fiber and 3 WT of graphite powder and pressed into a composite hydrogen storage electrode with a thickness of 100 μm. The electrode was then assembled with a solid electrolyte (Li3PS4) to form a solid hydrogen storage battery. The battery was subjected to charge-discharge cycle tests in a wide temperature range of -40℃ to 80℃.

[0039] Table 4: Electrochemical performance of hydrogen storage alloy electrodes in wide-temperature energy storage batteries

[0040] In summary, this invention achieves precise control of nanocrystalline structure through magnetic field-assisted mechanical alloying, reducing grain size by more than 50% compared to traditional methods; secondary magnetic field heat treatment effectively regulates the precipitation and orientation of magnetic phases; magnetron sputtering coating constructs a core-shell structure, increasing surface magnetization by 70%; magnetopolishing significantly improves surface quality, increasing hydrogen absorption rate by 252%; and ultimately achieves a breakthrough in low-altitude UAV applications with a 240% increase in endurance, and in wide-temperature energy storage battery applications with excellent capacity retention of >70% at -40℃.

Claims

1. A process for preparing a wide-temperature energy storage hydrogen storage material, characterized in that, Includes the following steps: S1, Raw material pretreatment: Select magnesium powder, nickel powder and iron powder with a purity of ≥99.9%. Pre-treat magnesium powder by ball milling under argon protection, with a ball-to-material ratio of 15:1, a rotation speed of 300 rpm and a time of 2 hours; reduce nickel powder and iron powder in a hydrogen atmosphere at 400℃ for 2 hours. S2, Magnetic Doping and Composition Design: Based on Stoichiometry of Mg 0.80 Ni 0.15 Fe 0.05 Prepare the raw materials, add 2wt% graphene nanosheets and 0.5wt% TiH2, and mix in an argon-protected glove box for 30 min; S3, Magnetic field-assisted mechanical alloying: The mixed raw materials are loaded into a stainless steel ball mill jar with a ball-to-material ratio of 20:

1. 10mm, 6mm and 3mm hard alloy balls are used. The ball milling is carried out in a planetary ball mill with a main disc speed of 350rpm, a rotation-to-revolution ratio of 2:1, intermittent operation, and a total ball milling time of 50h. 0.5MPa hydrogen gas is introduced into the jar to achieve in-situ hydrogenation. S4, Magnetic crystallization treatment: The ball-milled powder is loaded into a quartz tube, vacuum sealed, and placed in a magnetic field heat treatment furnace for secondary crystallization treatment. Level 1: Keep warm at 220℃ for 4 hours, and apply a 2T steady magnetic field; Second stage: Keep warm at 350℃ for 6 hours, and apply a 5T steady magnetic field; S5, Magnetron sputtering coating: Depositing a 5-10 nm thick Fe coating on the surface of crystallized powder. 0.40 Co 0.30 Ni 0.30 Magnetic thin film, sputtering power 80W, Ar gas pressure 0.5Pa, substrate bias -50V, time 3min; S6, Magnetic polishing treatment: Place the coating powder in a magnetic polishing device, use 1mm diameter zirconia balls as the medium, the ball-to-powder ratio is 3:1, and the polishing time is 2 hours.

2. The preparation process of a wide-temperature energy storage hydrogen storage material according to claim 1, characterized in that: The particle sizes of the magnesium powder, nickel powder, and iron powder are ≤50μm, ≤10μm, and ≤5μm, respectively.

3. The preparation process of a wide-temperature energy storage hydrogen storage material according to claim 1, characterized in that: In the S3 magnetic field-assisted mechanical alloying, the mass ratio of 10mm, 6mm and 3mm cemented carbide balls is 3:5:

2. When running intermittently, the ball mill is stopped for 10 minutes after 30 minutes.

4. The preparation process of a wide-temperature energy storage hydrogen storage material according to claim 1, characterized in that: The S1 raw material is pretreated with magnesium powder and then dried in a vacuum drying oven at 150°C for 4 hours, with a vacuum degree ≤10. -2 Pa.

5. The preparation process of a wide-temperature energy storage hydrogen storage material according to claim 1, characterized in that: In the S3 magnetic field-assisted mechanical alloying process, a Helmholtz coil structure is arranged outside the ball mill. The coil has a diameter of 300 mm, 500 turns, and an alternating magnetic field frequency of 50 Hz and an intensity of 0.5 T.

6. The preparation process of a wide-temperature energy storage hydrogen storage material according to claim 1, characterized in that: In S5, magnetron sputtering coating uses Fe... 0.40 Co 0.30 Ni 0.30 For the alloy target, a parallel magnetic field of 0.2T is applied during the sputtering process to induce magnetic anisotropy.

7. The preparation process of a wide-temperature energy storage hydrogen storage material according to claim 1, characterized in that: In the magnetic polishing process, the magnetic polishing device uses a 100Hz, 0.3T alternating magnetic field. After polishing, the sphericity of the powder increases from 0.75 to 0.92, and the surface roughness Ra decreases from 150nm to 30nm.

8. The application of a wide-temperature energy storage hydrogen storage material preparation process, characterized in that: The process for preparing a wide-temperature energy storage hydrogen storage material according to any one of claims 1-7 is applied to the manufacture of fuel cells for low-altitude unmanned aerial vehicles or wide-temperature energy storage batteries.

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