Method for preparing RE-Mg-Ni-M series hydrogen storage alloy

A hydrogen storage alloy and alloy technology are applied in the field of preparation of RE-Mg-Ni-M hydrogen storage alloys, which can solve the problems of uneven alloy composition and structure, difficult control of composition uniformity, and difficulty in realizing large-scale production. Achieve the effect of uniform Mg composition, convenient and fast smelting process, and easy control of volatilization

Active Publication Date: 2008-01-30
GRIMAT ENG INST CO LTD
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Problems solved by technology

The alloy of this system is prepared by powder sintering method, the experiment cycle is long, the alloy composition and structure are not uniform, the oxygen content is easy to exceed the standard, and it is difficult to realize large-scale production
The induction melting method is to melt Mg, RE, Ni and other metals together in a crucible, and the Mg metal must be in excess to a certain extent. However, due to the serious volatilization of Mg and the large difference in density and melting point from other metals, it is difficult to prepare The composition of the alloy meets the design requirements, and the uniformity of the composition is difficult to control; at the same time, there are safety problems such as dust explosion and fire induced by floating Mg metal dust

Method used

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  • Method for preparing RE-Mg-Ni-M series hydrogen storage alloy
  • Method for preparing RE-Mg-Ni-M series hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] According to the designed composition La 0.7 Mg 0.3 (Ni 0.85 co 0.15 ) 3.5 , prepare La (purity>99.5%), nickel-magnesium master alloy (Mg content 10~20%, Ni+Mg total content>99%), Ni (purity>99.5%), Co (purity>99.5%) altogether 70 grams , where the Mg content is designed to be over 20%. First put Ni and Co into the crucible, vacuumize to 0.1-1Pa, fill with high-purity argon (purity is 99.999%), repeat this 2-3 times, adjust the power of the equipment to 26.1KW for heating, and refine for 1 minute , fully cool down and take out the nickel-cobalt alloy ingot; then put the rare earth metal La into the crucible, evacuate to 0.1-1Pa, fill with high-purity argon, repeat this 2-3 times, and adjust the power of the equipment to 19.2KW Heating, refining for 1 minute, fully cooling and taking out the La ingot; then put the above two ingots together into the crucible, wherein the nickel-cobalt alloy ingot is placed at the bottom of the crucible, vacuumize to 0.1-1Pa, and fill...

Embodiment 2

[0060] According to the designed composition La 0.7 Mg 0.3 (Ni 0.79 co 0.15 al 0.06 ) 3.4 , prepare La (purity > 99.5%), nickel-magnesium master alloy (Mg content 10-20%, Ni+Mg total content > 99%), Ni (purity > 99.5%), Co (purity > 99.5%), Al ( Purity > 99.5%) totals 70 grams, wherein the Mg content is designed to exceed 20%. The smelting and preparation process was the same as in Example 1, and an as-cast La-Mg-Ni-Co-Al hydrogen storage alloy sample was obtained. Using the ICP-AES method to measure the content of each component element in the alloy (as shown in Table 2), the error is within ±4.0%, and the error of the Mg content is -3.67%, which can meet the requirements of the electrochemical performance test for the alloy composition. Electrochemical performance tests show that the maximum discharge capacity of the as-cast alloy sample reaches 367.9mAh / g, which is higher than that of the traditional RE-Ni system AB 5 Type hydrogen storage alloys are 10-20% higher. ...

Embodiment 3

[0064] The design components are the same as in Example 1, wherein the Mg content is designed to be in excess of 30%. The as-cast sample preparation process is the same as in Example 1. Take part of the as-cast alloy sample, wrap it with nickel tape and put it in an alumina ceramic crucible (60mm×20 / 30mm×15mm), put it into a muffle furnace together, and spread a layer of RE-Ni powder around it As an oxygen-absorbing agent, under the protection of an industrial-grade argon (99.99% pure, slightly positive pressure) atmosphere, heat treatment at 900°C for 8 hours, and then cool in the furnace to obtain a heat-treated sample of La-Mg-Ni-Co hydrogen storage alloy. The Mg element content in the sample was determined by ICP-AES method (as shown in Table 3), and the error was -2.13%, which can meet the requirements of the electrochemical performance test on the alloy composition. The electrochemical performance test shows that the maximum discharge capacity of the heat-treated sample...

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Abstract

The invention relates to a preparation method of RE-Mg-Ni-M based hydrogen storage alloy. Under the protection of inert gases, the as-cast condition products of the RE-Mg-Ni-M based hydrogen storage alloy are smelted through using a cold-crucible magnetic-suspension furnace; heat-treated products are obtained by heat treatment of the as-cast condition products. The method has the steps that: (1) material is prepared; (2) metal Ni and M are smelted together; (3) metal RE is smelted; (4) the casting ingots obtained from step (2) and step (3) are smelted; (5) the ingot obtained from step (4) is overturned and smelted to obtain alloy solution, then master alloy of magnesium is added into the alloy solution to obtain the as-cast condition products of the RE-Mg-Ni-M based hydrogen storage alloy by cooling; (6) heat treatment is carried out to the as-cast condition products to get the heat-treated product. The single weight of the as-cast condition products and heat-treated products is 50-1000g; the content of magnesium in the products is close to designed content; the components of the as-cast condition products are uniform and have high hydrogen storage capacity; the structure and components of the heat-treated products are uniform and also have high hydrogen storage capacity and long cycling life.

Description

technical field [0001] The invention relates to a preparation method of RE-Mg-Ni-M series hydrogen storage alloy. technical background [0002] Hydrogen storage alloys are metal hydrogen storage materials, because they can absorb and release hydrogen safely and reversibly in a large amount (the hydrogen storage density is higher than liquid hydrogen) under appropriate temperature and pressure, and the hydrogen absorption and desorption process is accompanied by certain thermal effects , so it has attracted attention as an energy conversion material and energy storage material related to clean energy-hydrogen energy. As a new type of functional material, the application fields of hydrogen storage alloys are as follows: (1) storage of hydrogen energy and thermal energy; (2) separation, recovery and purification of hydrogen; (3) separation of hydrogen isotopes; (4) civil or electric Negative electrode active materials for automotive nickel-metal hydride secondary batteries (he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22B9/00C22C19/03C22F1/02
Inventor 周增林宋月清崔舜林晨光闫震宇
Owner GRIMAT ENG INST CO LTD
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