A high-performance borohydride composite hydrogen storage material, its preparation method and application

Abstract

This invention relates to a high-performance borohydride composite hydrogen storage material, its preparation method, and its applications. The main components are a mixture of LiBH4, nano-BaTiO3, and carbon nanotube (CNT) powders. The composite material of this invention begins to release hydrogen at 223 °C, releasing 8.2 wt% of hydrogen gas, with the peak hydrogen release temperature decreasing to 353 °C. The hydrogen release capacity after the sixth cycle is 4.1 wt%. This provides a reference for improving on-board hydrogen storage efficiency and the efficiency of other new energy coupled energy storage systems.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen storage materials technology, and relates to a high-performance borohydride composite hydrogen storage material, its preparation method and application. Background Technology

[0002] Hydrogen energy, due to its high calorific value, pollution-free combustion products, and wide availability, is considered one of the most promising new energy sources to replace traditional fossil fuels. However, its widespread application is hampered by the lack of safe and efficient hydrogen storage methods. Currently, solid-state hydrogen storage, with its high storage capacity, has attracted significant attention from researchers.

[0003] Among them, borohydrides have significantly higher hydrogen storage capacity than other solid hydrogen storage materials, especially LiBH4, which has a theoretical hydrogen storage capacity of up to 18.5 wt% (weight percentage) and 121 g L. -1 (Volume percentage) It holds promise for large-scale application. However, the decomposition temperature of LiBH4 is as high as 300℃, exceeding the operating temperature of hydrogen fuel cells. Therefore, researchers have proposed many methods to improve its hydrogen storage performance: adding catalysts, nano-confining, and constructing composite systems with other hydrides. Furthermore, the re-hydrogenation of LiBH4 decomposition products requires harsh reaction conditions (600℃, 35 MPa), which also limits its application in practical scenarios. The large-scale hydrogen release phase of LiBH4 occurs in a liquid state; melting leads to particle agglomeration, a significant reason for its poor cycle stability.

[0004] Existing research indicates that various transition metals and their compounds can effectively destabilize LiBH4, especially bimetallic oxides, which show even better modification effects; while carbon materials with high specific surface area can effectively improve the cycling performance of LiBH4. Therefore, the simultaneous addition of both can achieve a synergistic catalytic effect, which is expected to better improve the hydrogen storage performance of LiBH4, providing a new perspective and optimization path for the modification research of LiBH4.

[0005] Chinese patent application CN201110328128.7 discloses a method for improving the hydrogen storage performance of lithium borohydride. First, under vacuum or inert gas protection, lithium borohydride is mixed with alkaline earth metal-aluminum hydride in a molar ratio of 2:1 to 10:1. Then, the mixed powder of lithium borohydride and alkaline earth metal-aluminum hydride is heated to a certain temperature, causing the alkaline earth metal-aluminum hydride to decompose into alkaline earth metal hydride, aluminum, or aluminum alloy. This method achieves the dual effect of in-situ and synergistic catalysis of the hydrogen desorption and resorption processes of lithium borohydride by alkaline earth metal-aluminum hydride, thereby significantly reducing the hydrogen desorption temperature of lithium borohydride and improving its hydrogen absorption and desorption kinetics. However, the hydrogen storage material provided by this patent has relatively poor cycle performance. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art by providing a high-performance borohydride composite hydrogen storage material, its preparation method, and its application, which has lower hydrogen absorption / desorption temperatures, faster kinetic performance, and excellent cycle retention rate.

[0007] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a high-performance borohydride composite hydrogen storage material, which is obtained by ball milling and mixing LiBH4 powder with BaTiO3 and CNTs powder, wherein the total mass content of BaTiO3 and CNTs powder does not exceed 50% and is not 0.

[0008] Furthermore, the mass content of BaTiO3 is 0-50%. When the mass content of BaTiO3 is 0%, it means that no BaTiO3 is added at this time. Preferably, it is not 0. For example, it can be 10%, 20%, 30%, 40%, etc. The mass content of CNT powder is 0-40%. When the mass content of CNT powder is 0%, it means that no CNT powder is added at this time. Preferably, it is not 0. For example, it can be 10%, 20%, 30%, 40%, etc. Thus, it can be defined as LiBH4+. x wt% BaTiO3 + y wt% CNTs, x is 0~50, y is 0~40.

[0009] Furthermore, the total mass content of BaTiO3 and CNTs powder is 10-50%.

[0010] In a second aspect, this invention provides a method for preparing high-performance borohydride composite hydrogen storage materials. LiBH4 powder is mixed with BaTiO3 and CNTs powder, then added to a ball mill jar for ball milling to obtain the high-performance borohydride composite hydrogen storage material. In this invention, LiBH4, BaTiO3, and CNTs are ball-milled together. During this process, the raw materials are thoroughly mixed, resulting in a smaller size and an increased surface area. Furthermore, a large number of defects are introduced, which can improve the subsequent reaction rate.

[0011] Furthermore, during the ball milling process, the ball-to-material ratio is 45~55:1, the ball milling speed is 380~420 rpm, and the time is 14~18h.

[0012] In a third aspect, the present invention provides the application of high-performance borohydride composite hydrogen storage materials in vehicle-mounted hydrogen storage and new energy coupled hydrogen storage.

[0013] Compared with the prior art, the present invention has the following advantages: (1) The high-performance borohydride composite hydrogen storage material prepared has a lower hydrogen absorption / desorption temperature, a faster hydrogen absorption / desorption rate, and higher cycle stability.

[0014] (2) The raw materials are common LiBH4 powder, BaTiO3 and CNTs, which are simple and readily available. The preparation method is simple, requiring only ball milling and powder mixing. The process is mature and can efficiently obtain solid hydrogen storage materials with high purity and excellent performance, making it easy to achieve mass production. Attached Figure Description

[0015] Figure 1 The LiBH4+ prepared in Examples 1, 2, 3 and Comparative Example 1 x wt% BaTiO3 ( x = 0,20, 40) + y wt% CNTs ( x = 0, 20, 40) SEM images of powders after the first hydrogen release, where (a) is a SEM image of LiBH4 after the first hydrogen release after ball milling, (b) is a SEM image of LiBH4 + 40 wt% CNTs after the first hydrogen release, (c) is a SEM image of LiBH4 + 40 wt% BaTiO3 after the first hydrogen release, and (d) is a SEM image of LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs after the first hydrogen release.

[0016] Figure 2 The LiBH4+ prepared in Examples 1, 2, 3 and Comparative Example 1 x wt% BaTiO3 ( x = 0,20, 40) + y wt% CNTs ( x = 0, 20, 40) Hydrogen storage performance test curves of composite hydrogen storage materials, where (a) is the hydrogen storage performance test curve of LiBH4 + x wt% BaTiO3 ( x = 0, 20, 40) + y wt% CNTs ( x (a) shows the temperature-dependent hydrogen desorption curves of the composite material (= 0, 20, 40), (b) shows the corresponding TPD differential curve, (c) shows the isothermal hydrogen desorption curves of LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs at 300, 350, and 400 °C, (d) shows the temperature-dependent hydrogen absorption curves of ball-milled LiBH4 and LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs, and (e) shows the temperature-dependent hydrogen absorption curves of LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs. x wt% BaTiO3 ( x = 0, 20, 40) + y wt% CNTs ( x=0, 20, 40) are the hydrogen desorption curves under two different temperatures, and (f) are the hydrogen desorption curves of LiBH4 after ball milling and LiBH4 + 20 wt% BaTiO3 + 20wt% CNTs.

[0017] Figure 3 The LiBH4+ prepared in Examples 1, 2, 3 and Comparative Example 1 x wt% BaTiO3 ( x = 0,20, 40) + y wt% CNTs ( x = 0, 20, 40) XRD patterns of composite hydrogen storage materials, where (a) is the XRD pattern after ball milling, (b) is the XRD pattern after hydrogen release, (c) is the XRD pattern after hydrogen absorption, (d) is the XRD pattern after secondary hydrogen release, (A) is ball-milled LiBH4, (B) is LiBH4 + 40 wt% CNTs, (C) is LiBH4 + 40 wt% BaTiO3, (D) is LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs.

[0018] Figure 4 Images of LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs prepared in Example 1, wherein (a) is a TEM image of LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs after the sixth hydrogen release, (b) is a SAED image, and (c) is an energy dispersive spectroscopy image.

[0019] Figure 5 The temperature-dependent hydrogen desorption curves are shown for LiBH4 + 40 wt% BaTiO3, ball-milled LiBH4, and LiBH4 + 40 wt% NaNbO3 prepared in Example 2, Comparative Example 1, and Comparative Example 2.

[0020] Figure 6 The temperature-dependent hydrogen desorption curves are for LiBH4 + 40 wt% CNTs in Example 3 and Comparative Example 1, for ball-milled LiBH4 and LiBH4 + 40 wt% Graphene. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0023] As used herein, the terms "and / or," "or / and," and "and / or" encompass any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected using at least two conjunctions selected from "and / or," "or / and," and "and / or," it should be understood that, in this application, the technical solution undoubtedly includes solutions connected by "logical AND," and also undoubtedly includes solutions connected by "logical OR."

[0024] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0025] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0026] This document only specifically discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0027] Unless otherwise specified, the temperature parameters in this application may be either constant temperature processing or processing within a certain temperature range. The constant temperature processing allows temperature fluctuations within the precision range controlled by the instrument, such as ±5°C, ±4°C, ±3°C, ±2°C, or ±1°C.

[0028] In this document, the term "suitable" as used in phrases such as "suitable combination," "suitable method," and "any suitable method" refers to the ability to implement the technical solution of this application, solve the technical problem of this application, and achieve the expected technical effect of this application.

[0029] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0030] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it means that it is selected from either "with" or "without." If there are multiple "optional" entries in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, each "optional" entry shall be independent.

[0031] In the description of the application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] Unless otherwise specified, all preparations and tests described herein took place at 25°C.

[0033] The terms “comprising,” “including,” “containing,” “having,” “comprising,” or other variations thereof are intended to cover non-closed inclusion, and no distinction is made between these terms. The term “comprising” means that other steps and ingredients may be added without affecting the final result. The compositions and methods / processes of the present invention comprise, consist of, and substantially consist of the essential elements and limitations described herein, as well as any additional or optional ingredients, components, steps, or limitations described herein. No distinction is made between the terms “efficacy,” “performance,” “effect,” and “potency” herein.

[0034] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0035] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, but sequentially is preferred.

[0036] In the following embodiments, the lithium borohydride powder (LiBH4, 98%, Alfaesa); the barium titanate nanoparticle powder (BaTiO3, 99.9% purity, Aladdin); the carbon nanotube powder (CNTs, 95% purity, Pioneer Nano) used, and other raw materials unless otherwise specified, are all commercially available products in the art.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0038] As used herein, the terms "and / or," "or / and," and "and / or" encompass any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected using at least two conjunctions selected from "and / or," "or / and," and "and / or," it should be understood that, in this application, the technical solution undoubtedly includes solutions connected by "logical AND," and also undoubtedly includes solutions connected by "logical OR."

[0039] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0040] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0041] This document only specifically discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0042] Unless otherwise specified, the temperature parameters in this application may be either constant temperature processing or processing within a certain temperature range. The constant temperature processing allows temperature fluctuations within the precision range controlled by the instrument, such as ±5°C, ±4°C, ±3°C, ±2°C, or ±1°C.

[0043] In this document, the term "suitable" as used in phrases such as "suitable combination," "suitable method," and "any suitable method" refers to the ability to implement the technical solution of this application, solve the technical problem of this application, and achieve the expected technical effect of this application.

[0044] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0045] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it means that it is selected from either "with" or "without." If there are multiple "optional" entries in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, each "optional" entry shall be independent.

[0046] In the description of the application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] Unless otherwise specified, all preparations and tests described herein took place at 25°C.

[0048] The terms “comprising,” “including,” “containing,” “having,” “comprising,” or other variations thereof are intended to cover non-closed inclusion, and no distinction is made between these terms. The term “comprising” means that other steps and ingredients may be added without affecting the final result. The compositions and methods / processes of the present invention comprise, consist of, and substantially consist of the essential elements and limitations described herein, as well as any additional or optional ingredients, components, steps, or limitations described herein. No distinction is made between the terms “efficacy,” “performance,” “effect,” and “potency” herein.

[0049] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0050] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, but sequentially is preferred.

[0051] In the following embodiments, the lithium borohydride powder (LiBH4, 98%, Alfaesa); the barium titanate nanoparticle powder (BaTiO3, 99.9% purity, Aladdin); the carbon nanotube powder (CNTs, 95% purity, Pioneer Nano) used, and other raw materials unless otherwise specified, are all commercially available products in the art.

[0052] Example 1: This embodiment provides a method for preparing a high-performance LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs high-performance borohydride composite hydrogen storage material. The specific steps are as follows: (1) Take 300 mg LiBH4, 60 mg BaTiO3 and 60 mg CNTs and place them together in a 100 mL ball mill jar. The mass ratio of the ball to the powder is 50:1. The mixture is ball milled at 400 rpm for 16 h to obtain a composite hydrogen storage material: LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs.

[0053] Figure 4 The images show SAED and HRTEM images of the high-performance borohydride composite hydrogen storage material LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs prepared in Example 1 above. In Figure (a), lattice fringes corresponding to the LiH (200), TiO2 (101), BaB6 (110), (210), and (211) crystal planes can be observed, indicating the presence of multiple crystalline phases in the sample. The ring diffraction pattern in Figure (b) indicates that the sample has a polycrystalline structure, and the diffraction rings belonging to the TiO2 (101) and BaB6 (210) crystal planes can be clearly identified. Figure (c) shows the elemental distribution of the hydrogen desorption products, and C, O, Ti, and Ba elements were detected. The sample exhibits the structural characteristics of amorphous Li3BO3 phase encapsulating crystalline LiH, BaB6, and TiO2 particles, in which BaB6 acts as a nucleation site and TiO2 acts as a catalyst, jointly promoting the reversible hydrogen absorption and desorption reaction.

[0054] Example 2 The preparation method of LiBH4 + 40 wt% BaTiO3 borohydride composite hydrogen storage material provided in this embodiment includes the following specific steps: (1) Take 300 mg LiBH4 and 120 mg BaTiO3 materials and place them together in a 100 mL ball mill jar. The mass ratio of the ball milling ball to the powder is 50:1. Mill at 400 rpm for 16 h to obtain a composite hydrogen storage material, LiBH4 + 40 wt% BaTiO3.

[0055] Example 3 The preparation method of LiBH4 + 40 wt% CNTs borohydride composite hydrogen storage material provided in this embodiment includes the following specific steps: (1) Take 300 mg LiBH4 and 120 mg CNTs materials and place them together in a 100 mL ball mill jar. The mass ratio of the ball milling ball to the powder is 50:1. Mill at 400 rpm for 16 h to obtain a composite hydrogen storage material, LiBH4 + 40 wt% CNTs.

[0056] Comparative Example 1 (1) Take 300 mg of LiBH4 material and place it in a 100 mL ball mill jar. The mass ratio of the ball milling ball to the powder is 50:1. Mill the powder at 400 rpm for 16 h to obtain the composite hydrogen storage material, which is LiBH4 treated by ball milling.

[0057] Figure 1 Figures (a), (b), (c), and (d) provide the LiBH4+ obtained in Examples 1, 2, 3, and Comparative Example 1. x wt% BaTiO3 ( x = 0, 20, 40) + y wt% CNTs ( x Images of the powder after the initial hydrogen release (0, 20, 40) show that the LiBH4 dehydrogenation product without CNTs exhibits severe agglomeration, forming large bulk structures. The sample with added CNTs shows a more dispersed particle distribution and smaller size, without significant melting and re-solidification of bulk materials. This indicates that the introduction of carbon materials inhibits the melting and agglomeration of LiBH4 after dehydrogenation to some extent. This is because carbon materials provide a confined space and dispersion support for LiBH4, increasing its specific surface area and thus accelerating the hydrogen diffusion process.

[0058] Figure 2 Figures (a), (b), (c), (d), (e), and (f) provide the LiBH4+ obtained in Examples 1, 2, 3, and Comparative Example 1. x wt% BaTiO3 ( x = 0, 20, 40) + y wt% CNTs ( x The hydrogen storage performance test results of the composite hydrogen storage materials (= 0, 20, 40) show that the initial hydrogen release temperature of LiBH4 + 20 wt% BaTiO3 + 20 wt% CNTs decreased to 223 °C, and 8.2 wt% hydrogen was released. The peak hydrogen release temperature decreased to 353 °C, and the hydrogen release capacity in the sixth test was 4.1 wt%, indicating a significant improvement in hydrogen storage performance.

[0059] Figure 3Figures (a), (b), (c), and (d) provide the LiBH4+ obtained in Examples 1, 2, 3, and Comparative Example 1. x wt% BaTiO3 ( x = 0, 20, 40) + y wt% CNTs ( x XRD patterns of the composite hydrogen storage material (= 0, 20, 40) show that LiBH4 reacts with BaTiO3 to form Li3BO3, BaB6, and TiO2 phases in situ. These phases, in synergy with CNTs, significantly improve the hydrogen absorption / desorption kinetics and cycling stability of LiBH4.

[0060] Comparative Example 2: The two examples are largely the same as in Example 2, except that the BaTiO3 powder is replaced with an equal mass of NaNbO3 powder. Figure 5 The additives used in Examples 2, 1, and 2 were LiBH4 + 40 wt% BaTiO3, ball-milled LiBH4, and LiBH4 + 40 wt% NaNbO3. The hydrogen desorption performance of Example 2 was significantly higher than that of Comparative Example 2, which in turn was higher than that of Comparative Example 1. Therefore, the hydrogen desorption performance of Example 2 was significantly higher than that of Comparative Example 1. This demonstrates that, even with the same bimetallic oxide as an additive, BaTiO3 exhibits a much higher catalytic effect than NaNbO3.

[0061] Comparative Example 3: Most of the components are the same as in Example 3, except that the CNT powder is replaced with an equal mass of graphene powder. Figure 6 Examples 3 and Comparative Example 1, specifically LiBH4 + 40 wt% CNTs in Comparative Example 3, and ball-milled LiBH4 and LiBH4 + 40 wt% Graphene were prepared. The hydrogen desorption performance of Example 3 was higher than that of Comparative Example 3, which in turn was higher than that of Comparative Example 1. Therefore, the hydrogen desorption performance of Example 3 was significantly higher than that of Comparative Example 1. This demonstrates that, even with carbon materials as additives, CNTs exhibit a higher catalytic effect than graphene.

[0062] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A high-performance borohydride composite hydrogen storage material, characterized in that, It is obtained by ball milling and mixing LiBH4 powder with BaTiO3 and CNTs powder, wherein the total mass content of BaTiO3 and CNTs powder does not exceed 50%.

2. The high-performance borohydride composite hydrogen storage material according to claim 1, characterized in that, The mass content of BaTiO3 is 0~50%, and the mass content of CNTs powder is 0~40%.

3. The high-performance borohydride composite hydrogen storage material according to claim 1, characterized in that, The total mass content of BaTiO3 and CNTs powder is 10-50%.

4. The high-performance borohydride composite hydrogen storage material according to claim 1, characterized in that, The mass content of BaTiO3 is 20%, and the mass content of CNTs powder is 20%.

5. The method for preparing the high-performance borohydride composite hydrogen storage material according to any one of claims 1-4, characterized in that, LiBH4 powder was mixed with BaTiO3 and CNTs powder and then added to a ball mill jar for ball milling to obtain a high-performance borohydride composite hydrogen storage material.

6. The method for preparing the high-performance borohydride composite hydrogen storage material according to claim 5, characterized in that, During the ball milling process, the ball-to-material ratio is 45~55:

1.

7. The method for preparing the high-performance borohydride composite hydrogen storage material according to claim 5, characterized in that, During the ball milling process, the ball milling speed is 380~420 rpm.

8. The method for preparing the high-performance borohydride composite hydrogen storage material according to claim 5, characterized in that, During the ball milling process, the milling time is 14~18 hours.

9. The application of the high-performance borohydride composite hydrogen storage material according to any one of claims 1-4 in vehicle-mounted hydrogen storage and new energy coupled hydrogen storage.

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