Nanocrystalline-amorphous high-capacity hydrogen storage electrode alloy and preparation method thereof

An electrode alloy and nanocrystalline technology, which is applied in the field of hydrogen storage alloy materials, can solve the problems of poor cycle stability of Ni-type hydrogen storage alloys, long-term preparation of amorphous, and difficulty in mass production, etc., to achieve electrochemical hydrogen storage at room temperature The effect of improved capacity, reduced thermal stability, and good low-temperature hydrogen absorption and desorption performance

Active Publication Date: 2014-03-19
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

[0008] However, Mg prepared by mechanical alloying 2 The cycle stability of Ni-type hydrogen storage alloy is very poor, and mechanical ball milling has some insurmountable shortcomings, such as it takes a long time to prepare amorphous, it is difficult to carry out mass production, and it is inevitable to cause balls and tanks to collide during the ball milling process. material contamination

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  • Nanocrystalline-amorphous high-capacity hydrogen storage electrode alloy and preparation method thereof

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Embodiment 1

[0031] According to the chemical formula (Mg 23.5 Zr 0.5 Ni 10 co 2 ) 0.9 Nd 0.1 , choose bulk metal magnesium, metal zirconium, metal nickel, metal cobalt and metal neodymium as raw materials, and the purity of all metals is ≥99.5%. The crucible capacity of the melting furnace is about 2kg, and the ingredients are calculated as 2kg per furnace. Weigh 922.4g of metal magnesium, 68.2g of metal zirconium, 877.6g of metal nickel, 176.2g of metal cobalt, and 25.2g of metal neodymium according to the chemical dosage ratio, and place them in the magnesia crucible of the intermediate frequency induction furnace, then cover the furnace cover and vacuumize About 40min to vacuum 5×10 -3 Above Pa, refill helium until the gas pressure reaches 0.04MPa, adjust the power to 4.5 kW, control the temperature at 650°C to melt magnesium metal, then adjust the power to 25 kW, control the temperature at 1600°C to melt other metals. After all the metals are melted, keep it under the melting c...

Embodiment 2

[0034] The composition of the alloy is: (Mg 23.5Zr 0.5 Ni 10 co 2 ) 0.8 Nd 0.2 Take by weighing metal magnesium 908.8g, metal zirconium 67.2g, metal nickel 864.6g by stoichiometric ratio, metal cobalt 173.6g, metal neodymium 55.8g, prepare alloy according to the method for example 1, difference is that the quenching speed of adopting is 10 m / s. The XRD test results show that the alloy has a nanocrystalline-amorphous structure, and the results are shown in figure 1 ; The electrochemical capacity and cycle stability of the alloy were tested with a program-controlled analog battery tester, and the results are shown in Table 1.

Embodiment 3

[0036] The composition of the alloy is (Mg 23.5 Zr 0.5 Ni 10 co 2 ) 0.95 Nd 0.05 Take by weighing metal magnesium 1008.7g, metal zirconium 74.6g, metal nickel 959.7g by stoichiometric ratio, metal cobalt 192.7g, metal neodymium 13.0g, prepare alloy according to the method for example 1, XRD test result shows that alloy has nanocrystal-non- crystal structure, see figure 1 ; The electrochemical capacity and cycle stability of the alloy were tested with a program-controlled analog battery tester, and the results are shown in Table 1.

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Abstract

The invention discloses a nanocrystalline-amorphous high-capacity hydrogen storage electrode alloy and a preparation method thereof. The alloy has a chemical formula (Mg[24-x]ZrxNi[12-y]Coy)[1-z]Ndz, wherein x, y and z are atomic ratios; x is more than 0 and less than 2, y is more than 1 and less than 4, and z is more than 0.05 and less than 0.20. The preparation method comprises the following steps of performing induction heating melting under the protection of inert gas, and injecting a molten alloy into a copper casting mold to obtain a cylindrical cast ingot; placing the cast ingot in a quartz tube, performing induction heating melting, and continuously spraying the molten cast ingot on the surface of a rotating water-cooled copper roller by using a slit nozzle in the bottom of the quartz tube to obtain a rapidly-quenched thin alloy strip with a nanocrystalline-amorphous structure. According to the alloy and the method, the electrochemical hydrogen storage performance of an Mg2Ni type alloy is improved by component design and structure regulation, and particularly, the electrochemical cycling stability is greatly improved.

Description

[0001] Technical field [0002] The present invention belongs to the field of hydrogen storage alloy materials technology, especially provides a NI-MH secondary battery MG-ZR-NI-CO-Co-ND system MG with nano crystal-amorphous structure MG 2 Ni -type high -capacity hydrogen storage electrode alloys and preparation methods. Background technique [0003] As a hydrogen storage material, due to its high hydrogen absorption, low density, and low preparation costs, magnesium and magnesium -based alloys have attracted great interest in researchers.Especially MG 2 Ni-type alloy, its electrochemical capacity is as high as 1000mAh / g, which is particularly suitable for its negative material for NI-MH batteries in terms of capacity. [0004] However, because the hydride of these materials has high thermal stability, which leads to poor hydrogen dynamics, which greatly limits the practical application of these materials. [0005] Therefore, how to reduce the thermal stability of alloy hydride a...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22C1/02
Inventor 李保卫任慧平张羊换张胤刘卓成胡锋
Owner INNER MONGOLIA UNIV OF SCI & TECH
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