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High-capacity reversible hydrogen storage composite material of LiBH4 doped fluoride, and preparation method thereof

A composite material and fluoride technology, applied in the field of materials, can solve the problems of poor cycle hydrogen discharge performance and high hydrogen discharge temperature, and achieve the effect of simple process and good cycle hydrogen discharge ability

Inactive Publication Date: 2015-11-11
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite material of the present invention can effectively solve LiBH 4 The existing problems such as high dehydrogenation temperature and poor cycle dehydrogenation performance can effectively improve LiBH 4 Hydrogen storage performance, the composite material can be used in electric vehicles, electronic products, military equipment and other fields, and has a good application prospect

Method used

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  • High-capacity reversible hydrogen storage composite material of LiBH4 doped fluoride, and preparation method thereof
  • High-capacity reversible hydrogen storage composite material of LiBH4 doped fluoride, and preparation method thereof
  • High-capacity reversible hydrogen storage composite material of LiBH4 doped fluoride, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] LiBH 4 Doped NbF 5 Preparation of high-capacity reversible hydrogen storage composites

[0032] In a glove box filled with flowing high-purity argon, weigh LiBH at a molar ratio of 5:1 4 and NbF 5The two components are then put into a stainless steel ball mill tank with a volume of 100ml. Under a ball-to-material ratio of 30:1, a rotating speed of 300rpm and an argon atmosphere, use a high-energy planetary ball mill for ball milling for 1min to obtain a ball-milled mixture, namely for LiBH 4 Doped NbF 5 The high-capacity reversible hydrogen storage composite material, its XRD pattern is as follows figure 1 Shown in curve a.

[0033] From figure 1 It can be seen from the XRD figure of a that under the conditions of the present embodiment, LiBH 4 and NbF 5 Only simple uniform mixing occurs, and the phase diffraction peaks of the two are clearly visible.

Embodiment 2

[0035] LiBH 4 Doped NbF 5 Hydrogen desorption of high-capacity reversible hydrogen storage composites

[0036] In a glove box filled with flowing high-purity argon, weigh LiBH at a molar ratio of 5:1 4 and NbF 5 Put the two components into a stainless steel ball mill tank, and use a high-energy planetary ball mill to mill for 1 minute at a ball-to-material ratio of 40:1, a speed of 400 rpm, and an argon atmosphere to obtain a milled mixture, which is 5LiBH 4 -NbF 5 High-capacity reversible hydrogen storage composites.

[0037] The 5LiBH prepared in this embodiment 4 -NbF 5 The curve of the hydrogen release capacity of the high-capacity reversible hydrogen storage composite material as a function of temperature is as follows: figure 2 shown, from figure 2 As can be seen in the 5LiBH 4 -NbF 5 The initial hydrogen desorption temperature of the composite is about 60 °C, while the undoped NbF 5 LiBH 4 The initial hydrogen desorption temperature is about 270°C. Through...

Embodiment 3

[0040] LiBH 4 Doped NbF 5 DSC-MS results of high-capacity reversible hydrogen storage composites

[0041] In a glove box filled with flowing high-purity argon, weigh LiBH at a molar ratio of 5:1 4 and NbF 5 The two components are put into a stainless steel ball mill jar with a volume of 100ml, and are ball milled with a high-energy planetary ball mill for 1min at a ball-to-material ratio of 30:1, a rotating speed of 400rpm and an argon atmosphere to obtain a ball-milled mixture, namely 5LiBH 4 -NbF 5 High-capacity reversible hydrogen storage composites.

[0042] The 5LiBH prepared in this embodiment 4 -NbF 5 The hydrogen release amount of the complex changes with temperature DSC-MS (ie, differential thermal-mass spectrometry curve) results are as follows image 3 As shown, it can be seen from the MS (mass spectrum) curve that the signal of hydrogen gas can be detected at about 60°C, indicating that 5LiBH 4 -NbF 5 The complex starts to release hydrogen at this tempera...

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Abstract

The invention discloses a high-capacity reversible hydrogen storage composite material of LiBH4 doped fluoride, and a preparation method thereof. The purpose of the invention is to solve the problems of high hydrogen desorption temperature, slow hydrogen desorption dynamics, strict afresh hydrogen absorption conditions, low generation rate and poor circularity of LiBH4 as a hydrogen storage material. A determination result shows that the hydrogen storage composite material can desorb hydrogen at about 60DEG C, and the hydrogen desorption amount at about 250DEG C can be greater than 4wt%; and the hydrogen desorption amount after multi-time cycle is still higher than 4.4wt%, so the hydrogen storage composite material has good cycle hydrogen desorption ability. The composite material can effectively solve the problems of high hydrogen desorption temperature and poor cycle hydrogen desorption performance of LiBH4, and effectively improves the hydrogen storage performance of LiBH4. The composite material can provide hydrogen for fuel cells and hydrogen-powered cells as a hydrogen source, can be widely used in the fields of electric automobiles, electronic products and military equipment, and can also be used to make mobile and portable power supplies. The preparation method has the advantages of simple process, high efficiency, reliability, and facilitation of industrial batch production.

Description

technical field [0001] The invention relates to the field of materials, especially the field of modification of hydrogen storage materials, specifically a LiBH 4 High-capacity reversible hydrogen storage composite material doped with fluoride and its preparation method. The invention uses fluoride doping to improve LiBH 4 A composite hydrogen storage material with good hydrogen release and reversible performance is prepared, which has the advantages of low production cost and good reversible performance, and has a good market application prospect. Background technique [0002] In recent years, with the depletion of fossil energy and the increasing environmental pollution, the development of a new type of renewable clean energy has become the focus of the world's common attention. As an ideal secondary energy carrier, hydrogen energy has the advantages of wide sources, cleanliness, and high efficiency, and is considered to be an important part of the future energy system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 寇化秦桑革黄志勇罗文华王小英张光辉
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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