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Hydrogen storage composite material of lithium borate-doped lithium borohydride and preparation method of hydrogen storage composite material

A composite material, lithium borohydride technology, applied in the field of hydrogen storage composite materials and its preparation, can solve the problems of unfavorable practical application, harsh reversible conditions, harsh hydrogen desorption conditions, etc., and achieve excellent reversible hydrogen storage performance, hydrogen absorption/desorption The effect of fast speed and simple preparation process

Active Publication Date: 2015-11-04
中骅飞天(北京)企业管理咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiBH 4 As a hydrogen storage material, there are two main problems: one is harsh hydrogen desorption conditions, the initial hydrogen desorption temperature is higher than 400 ° C, and only about half of the hydrogen can be released at 600 ° C; the second is difficult to achieve reversibility, and the reversible temperature is as high as 600 ℃ and hydrogen pressure up to 35MPa
[0004] Chinese patent (application number: 201310075690.2) discloses a LiBH 4 Hydrogen storage composite material doped with metal sulfide and its preparation method, the LiBH involved in this patent 4 -20wt.%MoS 2 The hydrogen storage composite system has the same amount of hydrogen absorbed in the two hydrogen absorption tests, and has good cycle reversibility, but its operating temperature is as high as 550 ° C, which is not conducive to practical application
In the research paper [X.B.Yu, D.M.Grant, and G.S.Walker. Dehydrogenation of LiBH 4 Destabilized with Various Oxides.J.Phys.Chem.C,2009,113:17945-17949], LiBH 4 Doped with Fe 2 o 3 Finally, the initial hydrogen desorption temperature of the hydrogen storage composite system is lower than 100°C, and the hydrogen desorption amount is about 6wt.% at 200°C. Although the hydrogen desorption rate is significantly reduced, the hydrogen absorption performance of the system is poor.
[0005] Although the composites prepared above, LiBH 4 The hydrogen storage performance has been improved to some extent, but there are still disadvantages such as poor hydrogen absorption performance or harsh reversible conditions.

Method used

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  • Hydrogen storage composite material of lithium borate-doped lithium borohydride and preparation method of hydrogen storage composite material
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  • Hydrogen storage composite material of lithium borate-doped lithium borohydride and preparation method of hydrogen storage composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Will Li 3 BO 3 0.34g with LiBH 4 1.66 g is placed in a ball milling tank after uniform mixing, 80 g of stainless steel balls are put into it, and high-energy ball milling is carried out under the protection of an argon (99.99%, 1 atm) atmosphere. for 1 h, after the ball milling was completed, it was naturally cooled to room temperature, and then compressed and packaged in an argon atmosphere.

[0018] Hydrogen desorption performance test: Take a small amount of the hydrogen storage composite material prepared above and put it into a P-C-T (pressure-composition-temperature) tester for temperature programmed desorption (TPD) test. The test results are as follows: figure 1 Shown, LiBH 4 -Li 3 BO 3 The initial dehydrogenation temperature of hydrogen storage composites and pure LiBH 4 The same as that of LiBH, but the amount of hydrogen released is from pure LiBH 4 8.0wt.% increased to 10.0wt.%.

Embodiment 2

[0020] Will Li 3 BO 3 1.00g with LiBH 4 1.00g is mixed evenly and placed in a ball mill jar, 60g of stainless steel balls are put in, and high-energy ball milling is carried out under the protection of an argon (99.99%, 1 atm) atmosphere. After the ball milling was completed, it was naturally cooled to room temperature, and then compressed into tablets and packaged in an argon atmosphere.

[0021] Hydrogen absorption / desorption performance test: Take a small amount of the hydrogen storage composite material prepared above and put it into a sample tube for cyclic hydrogen absorption / desorption rate test. The test results are as follows: figure 2 As shown, the reversible performance of the hydrogen storage composite at 400 °C and 5.0 MPa is comparable to that of pure LiBH 4 Significantly improved compared to. After 5 hydrogen absorption / desorption tests, the reversible hydrogen absorption capacity of the composite remained around 3.2 wt.%, which was higher than that of pu...

Embodiment 3

[0023] Will Li 3 BO 3 0.80g with LiBH 4 1. 20g is uniformly mixed and placed in a ball mill jar, 20g of stainless steel balls are put into it, and high-energy ball milling is carried out under the protection of an argon (99.99%, 1atm) atmosphere. After the ball milling was completed, it was naturally cooled to room temperature, and then compressed into tablets and packaged in an argon atmosphere.

[0024] Hydrogen desorption performance test: Take a small amount of compressed samples and put them into the sample tube for hydrogen desorption kinetics test. A hydrogen pressure of 3.0 MPa was given when the temperature was raised to prevent the sample from releasing hydrogen before 400°C. Test results such as image 3 Shown, LiBH 4 -Li 3 BO 3 The hydrogen release rate of the composite material is significantly improved, and the hydrogen release amount reaches 1.8wt.% at 1500S, which is pure LiBH 4 More than three times the amount of hydrogen released under the same cond...

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Abstract

The invention relates to a hydrogen storage composite material of lithium borate-doped lithium borohydride. The hydrogen storage composite material is composed of Li3BO3 and LiBH4 in a mass ratio of 0.2: 1 to 1: 1. A preparation method for the hydrogen storage composite material comprises the steps: under argon shield protection, putting LiBH4 and Li3BO3 which are uniformly mixed in a mass ratio in a ball-milling tank for ball-milling treatment, wherein the ball-milling time is 1-5 hours, the ratio of grinding media to material is 10: 1 to 40: 1, the rotary speed is 200-500 r / min, and ball-milling is carried out for 15 minutes at an interval of 15 minutes; and after ball-milling, naturally cooling the mixture to room temperature, taking out the mixture under argon protection, and hermetically packaging the mixture. The prepared hydrogen storage composite material is large in reverse absorption / hydrogen desorption amount and high in hydrogen absorption / desorption rate. In addition, according to the material provided by the invention, the raw materials are easily available, the cost is low, the preparation process is simple, and industrialized batch production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a hydrogen storage composite material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of social economy, human beings' demand for energy is increasing day by day, leading to the depletion of non-renewable energy sources such as fossil fuels, and the energy crisis is becoming more and more serious. At the same time, the extensive use of fossil fuels has also aggravated environmental pollution and seriously threatened the living environment of human beings. Therefore, in today's low-carbon and sustainable development, the research and development of new green renewable energy has become a consensus. [0003] Due to its abundant resources, high energy efficiency, and no pollution, hydrogen energy is one of the most ideal clean energy sources to replace fossil energy in the future. However, since hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 韩树民马雨飞刘婷刘洋郭亮亮
Owner 中骅飞天(北京)企业管理咨询有限公司