Magnesium-based hydrogen storage alloy containing long-period ordered accumulation structure and preparation method of magnesium-based hydrogen storage alloy

Abstract

The invention provides magnesium-based hydrogen storage alloy containing a long-period ordered accumulation structure. The chemical molecular formula of the magnesium-based hydrogen storage alloy is Mg-aX-bY-cLi, X represents one of V or Co, a, b and c represent mass percentage, a is larger than or equal to 3% and smaller than or equal to 8%, b is larger than or equal to 17% and smaller than or equal to 19%, c is larger than or equal to 0.5% and smaller than or equal to 1% and the balance Mg. The preparation method of the magnesium-based hydrogen storage alloy mainly includes the steps that alloy particles containing the above ingredients are put into a ball milling tank, stainless steel grinding balls with the size being 4-6 mm are added into the ball milling tank according to the ball material ratio of (15:1)-(20:1), the rotation speed is 300-400 r/min, rotation is stopped for 10 minutes after operation is performed for 30 minutes, powder with the average particle size being 50-90 nm is obtained after ball milling is performed for 30-50 hours and placed into a vacuum high-temperature furnace, the power is heated to 200 DEG C under an argon gas atmosphere, heat preservation is performed for 24 hours, and the magnesium-based hydrogen storage alloy containing the long-period ordered accumulation structure is prepared. According to the process, equipment is simple and easy to control, the cost is low, the hydrogenation and dehydrogenation temperature of the prepared magnesium-based hydrogen storage alloy is moderate, and hydrogenation and dehydrogenation dynamics performance is good.

Description

technical field [0001] The invention relates to a magnesium-based hydrogen storage alloy with a long-period ordered stacking structure and a preparation method thereof. Background technique [0002] With the reduction of fossil fuels and the increasing severity of environmental pollution, people urgently need to find a new energy source without environmental pollution. Hydrogen energy has many advantages such as cleanness, high energy, and no secondary pollution. Therefore, the development of hydrogen energy has aroused great interest. The hydrogen energy system includes hydrogen source development, hydrogen production technology, hydrogen storage technology, hydrogen utilization technology, etc. In the entire hydrogen energy system, hydrogen storage is the most critical link. [0003] Mg-based hydrogen storage alloys are one of the most promising hydrogen storage materials due to their high hydrogen storage capacity, low density, abundant resources, and low price. Howeve...

AI Technical Summary

Problems solved by technology

For example, LaMg was studied as early as the 1980s 12 , CeMg 12 , MmMg 12 , La 2 Mg 17 and La 2 Mg 16 The hydrogen storage performance of Ni, found that although this type of Mg-based alloy can absorb hydrogen at a lower temperature, the hydrogen absorption capacity is low, less than 4wt%, and the hydrogen desorption temperature is still high, greater than 300 ° C

Moreover, Mg recently studied by Ouyang Liuzhang et al. 3 Pr and Mg 3 PrNi 0.1 It can absorb hydrogen at room temperature, and the kinetic performance of hydrogen absorption and desorption is very good, the reversible hydrogen storage capacity is 2.58wt% and 3.23wt%, but the dehydrogenation temperature is still very high, about 300 ° C

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