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A nanocrystalline magnesium-aluminum-based hydrogen storage material and its preparation method

A hydrogen storage material and a magnesium-aluminum-based technology, which is applied in the field of nanocrystalline magnesium-aluminum-based hydrogen storage materials and preparation, can solve the problems such as the inability to meet the requirements of the energy storage density of the vehicle-mounted hydrogen storage system, poor mechanical properties, and difficulty in breaking. The ability to absorb and release hydrogen quickly, save production time, and reduce labor

Active Publication Date: 2019-01-18
CENT IRON & STEEL RES INST
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the only large-scale production of LaNi 5 The theoretical hydrogen storage capacity of the type hydrogen storage alloy is only 1.36wt.%, which is far from meeting the energy storage density requirements of the on-board hydrogen storage system and hydrogen refueling station
The compound formed by metal magnesium and metal aluminum has a high hydrogen storage capacity, but the alloy prepared by the traditional casting method has poor hydrogen absorption and desorption kinetics, and at the same time has good toughness and is difficult to break

Method used

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  • A nanocrystalline magnesium-aluminum-based hydrogen storage material and its preparation method
  • A nanocrystalline magnesium-aluminum-based hydrogen storage material and its preparation method
  • A nanocrystalline magnesium-aluminum-based hydrogen storage material and its preparation method

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preparation example Construction

[0037] The preparation method of the magnesium-aluminum base hydrogen storage alloy of the present invention comprises the following steps:

[0038] A. By chemical composition: Mg 100-x Al x +y(wt.%)C Weigh raw materials. In the formula, x is the atomic ratio, y is the mass percentage, and 10≤x≤30, 0≤y≤8. Choose 80-mesh magnesium grains and 200-mesh aluminum powder, and the purity of the metal used is >99%.

[0039]B. The magnesium particles and the aluminum powder are weighed and mixed according to the mass percentage, and the mixture is mixed with 1-8wt.% nano-graphite powder and put into a stainless steel ball mill jar. Add a certain mass ratio of stainless steel quenched grinding balls, the ball to material ratio is 20:1, and fill with high-purity argon as a protective gas. Set the rotating speed to 350r / min, start ball milling in the ball mill mode of 0.5h ball milling, rest 0.5h, and the total ball milling time is 10h. After ball milling, the powder was taken out an...

Embodiment 1

[0045] Example 1 Mg 90 Al 10

Embodiment 2

[0046] Example 2 Mg 90 Al 10 +1(wt.%)C

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Abstract

The invention relates to a nanocrystalline magnesium-aluminum-based hydrogen storage material and a preparation method thereof, the chemical formula of which is: Mg100-xAlx+y(wt.%)C. In the formula, x is the atomic ratio, y is the mass percentage, and 10≤x≤30, 1≤y≤8. The preferred alloy composition is Mg90Al10+5wt.%C. The preparation method is prepared by mixing and ball-milling magnesium particles, aluminum powder and nano-graphite powder in a planetary ball mill under the protection of high-purity argon. The main feature of the invention is that Mg and Al, which are abundant in nature and cheap in price, are used as constituent elements in the composition design, and a small amount of nano-graphite powder is added for mixed ball milling. The above-mentioned component materials prepared by this process have a nanocrystalline structure, the main phase is Mg phase, and a small amount of Al phase is also included. The material has fast hydrogen absorption and desorption performance and is easy to break. The maximum hydrogen storage capacity reaches 6.41wt.%, and the fastest time for saturated hydrogen absorption and desorption is only 600s. It is suitable for vehicle-mounted hydrogen storage systems or hydrogen refueling stations.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloys, in particular to a nanocrystalline magnesium-aluminum-based hydrogen storage material and a preparation method thereof. Background technique [0002] Hydrogen fuel cell vehicles (HFCV) are considered to be the ultimate form of future vehicles due to their advantages such as short recharge time, no secondary pollution, long cruising range, and easy maintenance. Japan, the United Kingdom, the United States, and South Korea are in a leading position in the research and development of HFCV. However, compared with the rapid development of electric vehicles (EV, HEV), HFCV has not yet reached the level of large-scale application. The main factor limiting its development is the lack of safe and efficient hydrogen storage methods in addition to higher prices. The existing high-pressure gaseous hydrogen storage and low-temperature liquefied hydrogen storage technologies cannot meet user ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/46
CPCB22F1/0003C22C23/02C22C32/0084B22F9/04B22F2009/045B22F2009/043C22C2202/04B22F1/068
Inventor 李亚琴尚宏伟祁焱郭世海张羊换赵栋梁
Owner CENT IRON & STEEL RES INST
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