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Magnesium base hydrogen storage material and its mechanical-alloying preparation method

A technology of mechanical alloying and hydrogen storage materials, applied in electrical components, circuits, battery electrodes, etc., can solve the problems of poor cycle stability, high working temperature, difficult activation, etc., achieve stable performance, fast hydrogen absorption and desorption, and storage The effect of a large amount of hydrogen

Active Publication Date: 2006-10-25
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium-based hydrogen storage materials obtained by these methods have disadvantages such as high working temperature, poor cycle stability or difficult activation to varying degrees.

Method used

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  • Magnesium base hydrogen storage material and its mechanical-alloying preparation method
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  • Magnesium base hydrogen storage material and its mechanical-alloying preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] Firstly, La and Ni are melted according to RE by traditional smelting method. 2-x m x (x=0.5) ratio, in an argon protective atmosphere, use an electric arc furnace to melt repeatedly 6 times to ensure that the alloy composition of the material is uniform. The alloy is crushed and passed through a 400-mesh sieve under the protection of argon, and packed in a vacuum seal.

[0029] La 1.5 Ni 0.5 and Mg metal powders according to La 1.5 Ni 0.5 Mg 17 Mix evenly, place in a sealed stainless steel ball mill tank, the ball-to-material ratio is 15:1, the ball quality is stainless steel, first vacuumize to 10 -3 Pa, and then filled with 5MPa hydrogen as a protective atmosphere. The Spex-8000 ball mill is used for ball milling, the speed of the ball mill is 1750 rpm, the ball milling time is 20-80 hours, and air cooling is carried out at the same time. The finally obtained magnesium-based hydrogen storage materials were measured by XRD, SEM, TEM, hydrogen storage capacity ...

Embodiment 2

[0032] La and Ni are made into LaNi alloy by smelting method, except La and Ni according to RE 2-x m x Except that the proportioning of (x=1) is different from embodiment 1, all the other smelting processes are all the same as embodiment 1.

[0033] Then LaNi and Mg metal powders were mixed according to LaNiMg 17Mix evenly, place in Spex-8000 type ball mill for ball milling, the ball mill speed is 1750 rpm, the ball to material ratio is 15:1, the ball milling time is 80 hours, the ball milling process is carried out under the protection of hydrogen at 5MPa, and the material The preparation and hydrogenation processes are combined and completed at one time. PCT, XRD and hydrogen absorption and desorption rate were measured for the material. PCT curve such as Figure 1-a As shown, the material can absorb 5.23wt% hydrogen at 280°C under 1MPa hydrogen gas. It can also absorb hydrogen up to 2.31wt% at 100°C.

[0034] When the temperature is between 150 and 300°C, the material...

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Abstract

The chemical components of the magnesium-base hydrogen storage material is La2-xMxMg17, in which M is selected from Cu, al, Ni, Fe, Co, Mn, V, Cr, Zn, Ca and Sn etc..., and 0<x<2. its production steps are: 1) preparing alloy La2-xMx by using traditional smelting method; 2) La2-xMx alloy and Mg powder are ball-milled under the atmosphere of hydrogen and argon gas. Said ball-mill procedure is conducted under the protection by hydrogen at 0.3-20.0. MPa to make the material preparation and hydrgenation procedure completed in one time.

Description

technical field [0001] The invention relates to a method for preparing a magnesium-based hydrogen storage material by a mechanical alloying method and the magnesium-based hydrogen storage material. Background technique [0002] Currently, hydrogen is a high-energy-density, high-efficiency clean energy, one of the most attractive forms of energy, and is considered an effective option to replace fossil fuels. Since the 1970s, many countries in the world have begun extensive research. According to the prediction of energy experts, hydrogen is expected to become a major secondary energy source at the end of the oil age. Using hydrogen storage materials to store and transport hydrogen, the structure is compact, safe and reliable, not only has no danger of explosion, but also can provide high-purity hydrogen. The standard for future new hydrogen storage materials determined by the International Energy Agency (1EA) is that the hydrogen storage capacity is greater than 5wt.%, and i...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/04H01M4/46H01M4/86
CPCY02E60/10Y02E60/50
Inventor 蒋利军李谦林勤周国治詹锋郑强杜军尉秀英李法兵王树茂
Owner GRIMAT ENG INST CO LTD
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