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

An electrode alloy and high-capacity technology, 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: 2016-04-13
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0007] 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

Method used

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

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Embodiment 1

[0030] According to the chemical formula (Mg 23.5 Zr 0.5 Ni 10 Co 2 ) 0.9 Nd 0.1 , select bulk metal magnesium, metal zirconium, metal nickel, metal cobalt and metal neodymium as raw materials, all metal purity ≥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 magnesium metal, 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 dose ratio, put them in a magnesia crucible of an intermediate frequency induction furnace, then cover the furnace cover and vacuumize About 40min to vacuum 5×10 -3 Above Pa, then fill with helium until the gas pressure reaches 0.04MPa, adjust the power to 4.5kW, control the temperature at 650°C to melt the metal magnesium, then adjust the power to 25kW, and control the temperature at 1600°C to melt other metals. After all the metals are melted, keep under the melting conditions for 5 ...

Embodiment 2

[0033] The composition of the alloy is: (Mg 23.5 Zr 0.5 Ni 10 Co 2) 0.8 Nd 0.2 ; Weigh 908.8g of magnesium metal, 67.2g of metal zirconium, 864.6g of metal nickel, 173.6g of metal cobalt and 55.8g of metal neodymium according to the chemical dose ratio, and prepare the alloy according to the method of Example 1, the difference is that the quenching speed used is 10m / s. XRD test results show that the alloy has a nanocrystalline-amorphous structure. The results are shown in figure 1 The electrochemical capacity and cycle stability of the alloy were tested with a program-controlled simulated battery tester. The results are shown in Table 1.

Embodiment 3

[0035] The composition of the alloy is (Mg 23.5 Zr 0.5 Ni 10 Co 2 ) 0.95 Nd 0.05 ; Weigh metal magnesium 1008.7g, metal zirconium 74.6g, metal nickel 959.7g, metal cobalt 192.7g, metal neodymium 13.0g according to the chemical dose ratio, prepare the alloy according to the method of Example 1, and the XRD test result shows that the alloy has nanocrystalline-non-crystalline crystal structure, see figure 1 The electrochemical capacity and cycle stability of the alloy were tested with a program-controlled simulated battery tester. 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.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, and in particular provides a Mg-Zr-Ni-Co-Nd system Mg with a nanocrystalline-amorphous structure for a Ni-MH secondary battery. 2 Ni-type high-capacity hydrogen storage electrode alloy and its preparation method. Background technique [0002] As hydrogen storage materials, magnesium and magnesium-based alloys have aroused great interest of researchers due to their high hydrogen absorption capacity, low density and low preparation cost. Especially Mg 2 Ni-type alloys have an electrochemical capacity as high as 1000mAh / g, and are particularly suitable as negative electrode materials for Ni-MH batteries in terms of their capacity. [0003] However, due to the high thermal stability of the hydrides of these materials, their hydrogen absorption and desorption kinetics are extremely poor, which greatly limits the practical applications of these materials. [0004] Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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