Cos2 catalyzed high-capacity hydrogen storage alloy and preparation method thereof

Abstract

The invention discloses CoS2-catalyzed high-capacity hydrogen storage alloy and a preparation method thereof. The hydrogen storage alloy comprises the following component: Mg[24-x-y]Y[x]Zr[y]Ni[12-z-m]Co[z]Fe[m] and n wt.% of CoS2, wherein x is more than 1 and less than 4, y is more than 0.5 and less than 2, z is more than 1 and less than 3, m is more than 0.2 and less than 1, and n is more than 2 and less than 10. The preparation method comprises the following steps: heating and smelting under the protection of inert gas, filling a copper casting mould with molten alloy, putting into a quartz tube, and after heating and melting, continuously spraying down to the surface of a rotary water-cooling copper roller through the bottom of the quartz tube under the pressure of the inert gas to obtain quickly quenched alloy; putting ground alloy powder into a ball mill tank for pre-ball-milling; after pre-ball-milling, adding a catalyst CoS2 and continuing to perform ball-milling under the same process to obtain alloy powder with nanocrystalline-noncrystalline structure. According to the preparation method, the thermal stability of alloy hydride is reduced, the gaseous hydrogen absorption and desorption capacity of the alloy is increased, and the dynamics performance of the alloy is improved.

Description

technical field [0001] The present invention relates to a CoS 2 Catalyzed high-capacity hydrogen storage alloys and methods for their preparation, particularly involving a CoS 2 Catalytic high capacity Mg-Y-Zr-Ni-Co-Fe based Mg 2 The invention relates to Ni-type hydrogen storage alloy powder and a preparation method thereof, belonging to the technical field of hydrogen storage alloy materials. Background technique [0002] Mg 2 Ni-type alloys are considered as the most promising hydrogen storage materials and anode materials for Ni-MH batteries due to their high hydrogen storage capacity, such as Mg 2 NeH 4 3.6 wt.%, Mg 2 CoH 5 4.5 wt.%, Mg 2 FeH 6 It is 5.4 wt.%. [0003] However, the extremely high thermal stability of the above-mentioned hydrides leads to extremely poor hydrogen absorption and desorption kinetics. In order to overcome the above shortcomings, various methods, including mechanical alloying, rapid quenching of melts, adding catalysts, etc., have b...

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Problems solved by technology

However, the metastable structure formed by ball milling will gradually disappear in the process of multiple hydrogen absorption and desorption cycles, so that the hydrogen absorption and desorption cycle stability of ball milled magnesium-based alloys is very poor.

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