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Magnesium based hydrogen storing alloy composite material and production thereof

A technology of magnesium-based hydrogen storage alloy and composite material, which is applied in the field of ball milling preparation of magnesium-based alloy composite material and its powder, which can solve the problems of poor oxidation resistance, corrosion resistance, slow hydrogen absorption and desorption speed, and high hydrogen absorption and desorption temperature. problems, to achieve the effects of superior corrosion resistance, fast hydrogen absorption and desorption, and high electrochemical capacity

Inactive Publication Date: 2005-07-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main disadvantages of magnesium-based hydrogen storage alloys: magnesium-based hydrogen storage alloys, medium-temperature hydrogen storage alloys, large enthalpy increase, high hydrogen absorption and desorption temperature, slow hydrogen absorption and desorption speed, and poor kinetic properties. In addition, the properties of magnesium and its alloys are lively , the oxide film is easy to form in the air on the surface, magnesium hydroxide is formed in the water vapor (or in the aqueous solution), and the anti-oxidation and corrosion resistance are poor. These shortcomings limit the practical application of magnesium-based hydrogen storage alloys.
Mg prepared by Iwakura et al. 50 Ni 50 The electrochemical capacity of the amorphous alloy electrode is as high as 1082mAh / g (IwakuraC et al.J.Alloys Compds, 270(1998): 142), but the corrosion resistance of the alloy is poor
Another Mg2Ni amorphous alloy prepared by ball milling has good hydrogen absorption and desorption kinetics, and its electrochemical capacity can reach more than 400mAh / g. However, due to its large surface area, the surface is extremely easy to oxidize, and its corrosion resistance is very poor. After 10 weeks The charge-discharge cycle, the capacity fading reaches 80% of the maximum capacity (Nam Hoo Goo et al.J.Alloys and Compds, 288(1999): 186)

Method used

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  • Magnesium based hydrogen storing alloy composite material and production thereof
  • Magnesium based hydrogen storing alloy composite material and production thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Mix Mg, Ni and other metal powders evenly according to the ratio of MgNi, place them in a sealed stainless steel grinding tank, put stainless steel balls in a weight ratio of 1:20, and fill with 1MPa hydrogen. The rotational speed of the ball mill was 450 rpm. The ball milling time was 80 hours. Use the same method to weigh Ni and B powders according to the NiB stoichiometric ratio, mix them evenly, and the rotating speed of the ball mill is 500 rpm. After ball milling for 100 hours, take it out, mix MgNi90wt% and NiB10wt% evenly according to the weight percentage, add it into a stainless steel grinding jar, fill it with argon, and the ball milling speed is 400 rpm, and ball milling for 10 hours. The product is subjected to X-ray diffraction phase analysis, scanning electron microscope and determination of alloy capacity. X-ray diffraction pattern ( figure 1 ) pointed out that the diffraction peak of the alloy before compounding was obviously broadened, and the diffr...

Embodiment 2

[0021] Mg, Ni metal powder by Mg 1.9 Al 0.1 Ni 0.9 Cu 0.1 The stoichiometric ratio is uniformly mixed, and pressed into small pieces with a diameter of 25 mm and a thickness of 20 to 50 mm under a pressure of 30 MPa. The small pieces of the mixture were sealed in a stainless steel container, filled with 0.5 MPa argon gas, placed in a crucible resistance furnace, heated to 540°C, and kept at a constant temperature for 4 hours to allow it to diffuse evenly and fully. After the product is cooled, it is pulverized, mixed evenly according to the weight percentage of MgNi90wt%, NiB10wt%, put it into a stainless steel grinding tank, fill it with argon, and the speed of the ball mill is 400 rpm, and the ball mill is 60 hours. The product is subjected to X-ray diffraction phase analysis, scanning electron microscope and measurement of alloy capacity, and the alloy particle size reaches 50-300nm. Mix the alloy powder with 300wt% carbonyl nickel powder evenly, make an electrode sampl...

Embodiment 3

[0023] Mg by ball milling 1.8 Al 0.2 The ratio of Ni to prepare magnesium-based alloys. By weight percent Mg 1.8 Al 0.2 Mix Ni 90wt% and NiB 10wt% evenly, add it into a stainless steel mill jar, fill it with argon gas, and mill at a rotational speed of 400 rpm for 100 hours. The product is subjected to X-ray diffraction phase analysis, scanning electron microscope and measurement of alloy capacity, and the alloy particle size is 10nm-150nm. Mix the alloy powder with 300wt% carbonyl nickel powder evenly, make an electrode sample with a diameter of 1.0cm under a pressure of 30MPa, weigh the mass of the small piece and calculate the true content of the active material, and then use two pieces of foam with a diameter of 2.5cm Nickel sandwiches the small pieces in the middle, compacts them with a pressure of 10MPa, and spot welds the tabs. The electrochemical capacity is determined by the test electrode, sintered NiOOH / Ni(OH) 2 It is measured by a three-electrode system consi...

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Abstract

The invention is about Mg-base hydrogen storage material and the method of the procedure. It has the chemical composition of Mgp-xMxNi-yNy-NieBf, M has the alternative of Al, Mn, Sn, Ca, Li, B, Na, B, Na, K, La, Ce, Nd, Pr, Y and misch metal. N has the alternative of V, Cu, Ti, Co, Fe, Ag, Cr, Zr, Se, Nb, Mo, W, Nb, C, Si and Sn, 1.0 <=p<=2.5, 0<=x<=1.0, 0<=y<=0.8, 1<=e<=3, 1<=f<=3. It has a good property under normal temperature and pressure, the electric pole that made by it has a high galvano-chemistry capability and cycle life. Its advantages include stable property; low price; extensive use of Ni-H battery, H accumulator, H power auto and fuel battery.

Description

technical field [0001] The invention relates to the preparation and application of a magnesium-based alloy composite material and its powder by a ball milling method. Background technique [0002] Hydrogen is an important energy material, which has shown great advantages and application prospects in terms of reversibility, storage and environmental friendliness. Among the currently researched hydrogen storage alloy materials, magnesium-based hydrogen storage alloys have unique advantages such as high hydrogen storage capacity, light weight, low price and abundant reserves, and are also the only metal hydride hydrogen storage alloys that can meet international hydrogen storage standards. It has great research and development prospects and has become a hot research topic at home and abroad. [0003] The main disadvantages of magnesium-based hydrogen storage alloys: magnesium-based hydrogen storage alloys are medium-temperature hydrogen storage alloys with large enthalpy incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C23/00
Inventor 王一菁袁华堂焦丽芳曹建胜邹雅冰王永梅
Owner NANKAI UNIV
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