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Magnesium-based complex phase hydrogen storage material and preparation thereof

A hydrogen storage material and hydrogen technology, which can be applied to various metal hydrides and other directions, can solve the problems of unsatisfactory thermodynamics and kinetic properties of hydrogen absorption and desorption, and achieve the effects of mild conditions, simple equipment and fast speed.

Inactive Publication Date: 2008-10-08
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at preparing magnesium-based coordination hydride Mg(AlH 4 ) 2 The disadvantages of the method, and the magnesium-based hydride MgH 2 To solve the problem of unsatisfactory thermodynamic and kinetic properties of hydrogen absorption and desorption, provide a new type of high-capacity magnesium-based composite hydrogen storage material, and propose a synthesis method for preparing magnesium-based composite hydrogen storage material by "melting casting-ball milling hydrogenation reaction synthesis"

Method used

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  • Magnesium-based complex phase hydrogen storage material and preparation thereof
  • Magnesium-based complex phase hydrogen storage material and preparation thereof
  • Magnesium-based complex phase hydrogen storage material and preparation thereof

Examples

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Embodiment 1

[0023] Embodiment 1: a kind of preparation method of magnesium-based composite phase hydrogen storage material, concrete steps are as follows:

[0024] (1) According to the composition of lithium 14%, aluminum 1.0%, and magnesium as the balance, the Mg-Li-Al alloy is smelted in an induction furnace under the protection of argon, and poured into an ingot by a water-cooled mold. This step can be done in a conventional way.

[0025] (2) Mill the above-mentioned Mg-Li-Al alloy ingot into 15-20 mm square fine chips with a milling machine, and then ball mill it in a planetary ball mill for 10 hours under the protection of argon (atmospheric pressure). figure 1 It is the X-ray diffraction pattern of the powder after fine ball milling for 2 hours, and the pattern shows that the powder is mainly composed of two phases of Li(Mg) solid solution and Mg(Li) solid solution.

[0026] (3) Reactive ball milling was carried out under a hydrogen atmosphere. First, vacuumize the ball mill syste...

Embodiment 2

[0029] Example 2: A preparation method of a magnesium-based multiphase hydrogen storage material, the specific steps are the same as in Example 1. Wherein the difference is that in the step (1), according to the weight percent content of lithium 21%, aluminum 3.0%, and the balance being magnesium, the Mg-Li-Al alloy is smelted under the protection of argon in an induction furnace, and cast in a water-cooled mold ; In addition, in step (2), the ball milling time is 6 hours, and the reaction ball milling time in step (3) is 8 hours; the hydrogen pressure is 0.2MPa.

Embodiment 3

[0030] Example 3: A preparation method of a magnesium-based composite hydrogen storage material, the specific steps are the same as in Example 1. Wherein the difference is that in the step (1), according to the weight percentage content of lithium 9%, aluminum 1.5%, and the balance being magnesium, the Mg-Li-Al alloy is smelted under the protection of argon in an induction furnace, and the water-cooled mold is poured. ; In addition, in step (2), the ball milling time is 16 hours, and the reaction ball milling time in step (3) is 12 hours; the hydrogen pressure is 0.8MPa.

[0031] By adopting the fusion casting-ball milling hydrogenation reaction synthesis method of the present invention, the magnesium-based coordination hydride is reacted and synthesized while the material is modified, and the hydrogen storage performance of the magnesium-based hydrogen storage material is further improved. The magnesium-based composite hydrogen storage material is nano-scale black powder, suc...

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PUM

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Abstract

The invention provides high-volume mg-based multiphase hydrogen storage material and a preparation method thereof. A fusion casting and ball milling method is adopted, which comprises the specific steps: (1) under vacuum or argon protection, Mg-Li-Al alloy ingot is melted and cast in an induction furnace; (2) the ingot is milled into fines with a milling machine and is thinning ground in a ball milling machine for 2-20 hours; (3) reaction milling is carried out under hydrogen atmosphere; the hydrogen pressure is 0.1-1 MPa; hydrogen is filled in a ball milling tank to the initial value of the hydrogen pressure at short intervals during the ball milling process; and the way of compulsory cooling is adopted to control the working temperature in the ball milling tank less than 50-60 DEG C; then the mg-based multiphase hydrogen storage material is prepared after argon packaging. The preparation process of the method and modification of the material are accomplished simultaneously. The initial hydrogen desorption peak temperature of the prepared hydrogen storage material is only 62 DEG C and the hydrogen storage amount is as high as 10.6wt percent. The hydrogen storage material is black nano-powder and has large hydrogen storage amount, low temperature and rapid speed for hydrogen desorption. The material can be used for hydrogen fuel vehicles, rechargeable batteries and fuel cells, etc. The method has moderate preparation condition, simple device and convenient operation.

Description

technical field [0001] The invention relates to a modified coordination magnesium-based hydride composite material and a preparation method thereof, belonging to the field of hydrogen storage materials. Background technique [0002] At present, human beings are facing multiple pressures such as resource scarcity and environmental pollution. The research and development of clean energy is one of the key ways to solve or alleviate the above problems. Hydrogen energy is recognized as clean energy. As one of the alternative energy sources that may replace traditional energy sources, hydrogen energy has shown great advantages in terms of reversibility, storage and environmental friendliness. The utilization of hydrogen energy depends on the development and application of hydrogen storage materials with superior performance and high safety. Metal hydrogen storage materials have been paid attention to as one of the ways of hydrogen supply. The US Department of Energy's 2010 hydr...

Claims

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Application Information

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IPC IPC(8): C01B6/24
Inventor 张静白晨光潘复生
Owner CHONGQING UNIV
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