Synthetic method of Mg-based hydrogen storage alloy

Abstract

A synthetic method of Mg-based hydrogen storage alloy is designed to solve technical problems of high hydrogen absorption and desorption temperature, low hydrogen absorption and desorption speed, less charge and discharge capacity, and poor corrosion resistance of currently synthesized Mg-based alloy. The method prepares (M40Al60)90Ni10 hydrogen storage alloy by controlling alloy components and ball milling time, and the method is realized by the following steps: proportionally mixing pure Mg, pure Al and pure Ni with a particle size of more than 100 microns and a mass ratio of not less than 99.99%, performing ball milling in a ball milling tank of a high-energy ball mill with a mass ratio of balls and the materials of 10:1; vacuumizing the ball milling tank firstly, then introducing argon; shutting down for 30 min after ball milling for every 1 hour, wherein the total time for ball milling is 10 hours, so as to obtain the (M40Al60)90Ni10 hydrogen storage alloy which is provided with a Ml2Al3 new phase. The beneficial effect is that: the synthetic method has low requirements for the hydrogen absorption and desorption temperature, increases the hydrogen absorption and desorption speed, and enhances the reaction dynamic and thermodynamic performance; the discharge capacity determined in a 6 mol / L KOH solution is 316.7 mAh / g, and the corrosion current density is 2.84*10<-5> Amp / cm2; and the charge and discharge capacity and the corrosion resistance of the Mg-based hydrogen storage alloy are obviously increased.

Description

Technical field: [0001] The invention relates to a synthesis method, in particular to a synthesis method of a Mg-based hydrogen storage alloy. The Mg-based hydrogen storage alloy synthesized by this method can be widely used in the fields of fuel cells, hydrogen storage systems of hydrogen-powered vehicles, hydride negative electrode materials of Ni / MH batteries, and the like. Background technique: [0002] Magnesium-based alloys are considered to be one of the most promising hydrogen storage materials because of their advantages such as low density, large hydrogen storage capacity, low price, and no pollution. They are also most likely to be used for hydrogen storage in fuel cells and hydrogen-powered vehicles. However, its high hydrogen absorption and desorption temperature, slow hydrogen absorption and desorption speed, poor reaction kinetics and thermodynamic properties, and poor corrosion resistance hinder its practical application. Magnesium-aluminum series is a very ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of high hydrogen absorption and desorption temperature, slow hydrogen absorption and desorption speed, poor reaction kinetics and thermodynamic properties, and poor corrosion resistance of currently synthesized magnesium-based alloys, which hinder its practical application, the present invention provides a A synthetic method of a Mg-based hydrogen storage alloy that can improve the charge-discharge capacity and corrosion resistance of magnesium-based hydrogen storage alloys. The method adopts mechanical alloying to prepare (M 40 Al 60 ) 90 Ni 10 Hydrogen storage alloy, the realization step of this method is:

Images