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High capacity Mg2Ni-type hydrogen storing alloy amorphous band and preparation method thereof

A technology of hydrogen storage alloy and amorphous strip, which is applied in the field of hydrogen storage alloy materials, can solve the problem that the powder particle size does not meet the requirements of Ni-MH battery use, the alloy composition design and spraying process are not well matched, and the alloy electrochemical Poor cycle stability and other problems, to achieve the effects of good cycle hydrogen storage and release stability, high electrochemical cycle stability, and high production efficiency

Active Publication Date: 2007-11-28
CENT IRON & STEEL RES INST
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  • Abstract
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Problems solved by technology

However, the preparation efficiency of mechanical alloying is very low, the particle size of the obtained powder does not meet the requirements of Ni-MH batteries, and the electrochemical cycle stability of the alloy is extremely poor, which is far from meeting the requirements of practical application.
In addition, the ultrafine powder obtained by mechanical alloying is very easy to oxidize, which reduces the other electrochemical properties of the alloy.
Mg has been prepared by rapid quenching method at home and abroad 2 According to reports on Ni alloy amorphous flakes, the alloy composition is mainly composed of rare earth elements such as Mm, Y, Nd, etc., but no continuous amorphous strip with uniform thickness is formed, mainly because the composition design of the alloy and the spraying process are not good enough. good match

Method used

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  • High capacity Mg2Ni-type hydrogen storing alloy amorphous band and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] Select bulk metal magnesium, metal nickel and metal lanthanum with a purity ≥ 99.8%. According to the chemical formula Mg 18 La 2 Ni 10 Chemical dose ratio weighing. Weigh 369.6g of metal magnesium, 405.8g of metal nickel, and 224g of metal lanthanum, place them in a magnesium oxide crucible equipped with an intermediate frequency induction furnace, then cover the furnace cover, and vacuumize for about 40 minutes to a vacuum degree of 5×10 -3 Above Pa, then fill helium protective gas until the air pressure reaches 0.04MPa negative pressure, adjust the power to 4.5kw, control the temperature at 650°C to melt the metal Mg, then adjust the power to 25kw, and control the temperature at 1000°C to make the metal nickel and lanthanum melting. After the metal is melted, keep it under the melting condition for 5 minutes, and finally pour the melt into the ingot mould, and when pouring into the ingot mould, adjust the power to 8.2kw. After cooling for 20 minutes under a heli...

Embodiment 2

[0025] The preparation composition is: Mg 16 La 4 Ni 10 Mg 2 Ni-type hydrogen storage alloy amorphous strip; Weigh 279.4g of metal magnesium, 383.2g of metal nickel, and 380.8g of metal lanthanum, place them in a magnesia crucible equipped with an intermediate frequency induction furnace, then cover the furnace cover, and vacuumize for about 40 minutes to vacuum 5×10 -3 Above Pa, then fill helium protective gas until the air pressure reaches 0.04MPa negative pressure, adjust the power to 4.5kw, control the temperature at 650°C to melt the metal Mg, then adjust the power to 25kw, and control the temperature at 1000°C to make the metal nickel and lanthanum melting. After the metal is melted, keep it under the melting condition for 5 minutes, and finally pour the melt into the ingot mould, and when pouring into the ingot mould, adjust the power to 8.2kw. After cooling for 20 minutes under a helium protective atmosphere, it is released from the oven

[0026] Put about 100g o...

Embodiment 3

[0028] The preparation composition is: Mg 14 La 6 Ni 10 Mg 2 Ni-type hydrogen storage alloy amorphous strip; Weigh 212.6g of metal magnesium, 333.4g of metal nickel, and 569g of metal lanthanum, place them in a magnesia crucible equipped with an intermediate frequency induction furnace, then cover the furnace cover, and vacuumize for about 40 minute to vacuum 5×10 -3 Above Pa, then fill helium protective gas until the air pressure reaches 0.04MPa negative pressure, adjust the power to 4.5kw, control the temperature at 650°C to melt the metal Mg, then adjust the power to 25kw, and control the temperature at 1000°C to make the metal nickel and lanthanum melting. After the metal is melted, keep it under the melting condition for 5 minutes, and finally pour the melt into the ingot mould, and when pouring into the ingot mould, adjust the power to 8.2kw. After cooling for 20 minutes under a helium protective atmosphere, it is released from the oven

[0029] Put about 100g of t...

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Abstract

This patent belongs to hydrogen storage alloy technology field, and it provides a kind of Mg2Ni type hydrogen storage alloy amorphous zonal material and the method to prepare it. The chemical formula of this amorphous zonal material is Mg20-xLaxNi10-yZry. In the formula: 0.5<=x<=10, 0<=y<=5. The preparation method of the above amorphous zonal material is as following (1)To weigh material according to the chemical formula Mg20-xLaxNi10-yZry. (2) To melt the raw material, which has been weighed, and Mg20-xLaxNi10-yZry alloy can be obtained. (3) To make it into Mg2Ni type hydrogen storage alloy fast quenched thin strip, the thickness of which is between 20 and 35 mu m, and the breadth of which is between 1and 20mm, according to fast quenching blast strip technology. The Mg2Ni type hydrogen storage alloy amorphous zonal material in this patent owns high electrochemistry capability and favorable stability to season hydrogen cycle. The preparation technology is stable and easy to operate, the efficiency of it is high, and it is suitable to produce in batches, the thickness of the amorphous zonal material prepared by the method is uniform and the length of it is continuous.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, and in particular provides a high-capacity Mg 2 Ni-type hydrogen storage alloy amorphous strip and its preparation method. Background technique [0002] Magnesium-based alloys have the characteristics of light weight, high hydrogen storage density, and abundant resources, and are currently recognized as the most promising hydrogen storage materials for application and development. Especially Mg 2 Ni-type hydrogen storage alloy has a very high theoretical electrochemical capacity (up to 999mAh / g), but the crystalline Mg 2 Ni alloys have almost no reversible ability to absorb and desorb hydrogen at room temperature. Amorphous Mg can be obtained by mechanical alloying 2 Ni powder greatly improves the hydrogen storage kinetics of the alloy. However, the preparation efficiency of mechanical alloying is very low, the particle size of the obtained powder does not meet the r...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22C45/04C22C1/00C22C1/02B22D21/00B22D27/04
Inventor 张羊换赵栋梁王新林李平庞在广
Owner CENT IRON & STEEL RES INST
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