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A nano-magnesium-based composite hydrogen storage material and its preparation method

A hydrogen storage material, nano-magnesium technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as uneven material composition, achieve the effect of improving ball milling efficiency, excellent performance, and overcoming the effect of sticking to the wall

Active Publication Date: 2020-11-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium has a certain degree of plasticity and toughness, and it will adhere to the grinding ball and the tank wall during the mechanical ball milling process, resulting in uneven material composition.

Method used

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  • A nano-magnesium-based composite hydrogen storage material and its preparation method
  • A nano-magnesium-based composite hydrogen storage material and its preparation method
  • A nano-magnesium-based composite hydrogen storage material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 1kg of pure magnesium ingots (purity greater than 99%) and 0.15kg (15wt%) of misch metal into the magnesia crucible of the vacuum induction melting furnace, and evacuate to 2.0×10 -2 Pa below, and then filled with 0.04-0.06MPa pressure of high-purity argon (purity 99.999Vol.%). Adjust the power of the intermediate frequency induction coil to 8-10kW, heat the metal raw material, and after all the metal blocks are completely melted, continue to keep warm for 10-15 minutes to homogenize the alloy composition. After the smelting is completed, the alloy melt is poured into a circular ingot with a diameter of 30mm in a cast iron mold, and the magnesium-rare earth alloy ingot is obtained after cooling to room temperature. Cross 100 mesh standard sieves after the alloy ingot is mechanically pulverized, then get magnesium-rare earth alloy powder 5g, carbonyl nickel powder 0.25g (5wt%), graphite powder 0.15g (3wt%), organic liquid grinding aid tetrahydrofuran 5g (100wt%) ) p...

Embodiment 2

[0039] The other steps of the material preparation method in the present embodiment are the same as in Example 1, except that the ball milling time is 5 hours, the carbonyl nickel powder in the ball milling process is 0.5g (10wt%), and the graphite powder is 0.25g (5wt%) , the grinding aid is ethanol, and the grinding aid addition is 2.5g (50wt%).

[0040] No obvious wall sticking phenomenon was found in the material after ball milling, and the material recovery rate was about 94%. The hydrogen absorption kinetic curve of the composite material after five times of hydrogen absorption and desorption activation is shown in the attached Image 6 shown. It can be seen that the saturated hydrogen absorption capacity of the material after 5 minutes at 300° C. is about 5.2 wt%, which is slightly lower than that of Example 1. The material also has good hydrogen absorption kinetics at 100°C, and the hydrogen absorption amount can reach more than 5wt% within 30 seconds.

Embodiment 3

[0042] The other steps of the material preparation method in this embodiment are the same as in Example 1, except that the amount of rare earth added in the alloy smelting process is 0.1kg (10wt%), and the quality of carbonyl nickel powder in the ball milling process is 0.15g (3wt%) , the graphite powder quality is 0.05g (1wt%), and the grinding aid is n-heptane.

[0043] The material after ball milling has obvious wall sticking phenomenon, and the sample recovery rate is about 68%. The SEM microstructure of the composite material of this embodiment is as attached figure 2 As shown, the material is also made of fine particle clusters, and the large particle size is 10-70 microns. The hydrogen absorption kinetic curve of the material after five times of hydrogen absorption and desorption activation is shown in the attached Figure 7 shown. It can be seen that the saturated hydrogen absorption capacity of the material after 5 minutes at 300°C is about 6.3wt%, but the hydroge...

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Abstract

The invention relates to a nano-magnesium-based composite hydrogen storage material and a preparation method thereof. The material comprises a main component of magnesium, and simultaneously comprisesa plurality of catalysts of mixed rare earth, carbonyl nickel powder and graphite so as to improve the low-temperature hydrogen absorption performance of the material. The material has a nanocrystalstructure, the grain size is 20-50 nanometer, and the material has excellent low-temperature hydrogen absorption dynamics performance. The preparation method comprises the following steps of firstly,carrying out vacuum smelting on pure magnesium and a certain amount of mixed rare earth by adopting a vacuum induction melting method to prepare a brittle magnesium-rare earth alloy ingot with magnesium doped with rare earth elements in situ; and then mixing the obtained alloy with carbonyl nickel powder, graphite powder and inert organic grinding aid, and further preparing a high-capacity magnesium-based composite hydrogen storage material through a mechanical ball milling method. The preparation method of the material overcomes a wall sticking phenomenon in a mechanical ball milling processof the magnesium-based hydrogen storage alloy, so that the material recovery rate is improved, and the high-capacity magnesium-based composite hydrogen storage material with excellent low-temperaturehydrogen absorption performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, in particular to a high-capacity magnesium-based hydrogen storage material with excellent low-temperature hydrogen absorption kinetic performance and a preparation method. Background technique [0002] As a clean, efficient, abundant and sustainable ideal secondary energy, hydrogen energy is regarded as the energy material with the most development potential, and has attracted widespread attention worldwide. Safe and efficient hydrogen storage technology is one of the key links in the process of hydrogen energy utilization. The metal hydride method for hydrogen storage has the advantages of high bulk density, good reversibility, and high safety, and is considered to be the most promising hydrogen storage material. The reversible hydrogen storage capacity of magnesium is as high as 7.6wt.%. In addition, magnesium has the advantages of abundant resources, low price, and environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/05H01M4/38H01M4/46
CPCC22C1/05C22C23/06H01M4/383H01M4/466Y02E60/10
Inventor 杨泰王鹏李强梁春永夏超群王洪水
Owner HEBEI UNIV OF TECH
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