Magnesium-based hydrogen storage alloy material and preparation method thereof

Abstract

The invention discloses a magnesium-based hydrogen storage alloy material and a preparation method thereof. The chemical general formula of the material is Mgz-xMxNi-Nia-d-eTdAe, Nia-d-eTdAe is coated on the surface of a Mgz-xMxNi amorphous alloy, and the mass ratio of the Mgz-xMxNi amorphous alloy to the Nia-d-eTdAe is 10:1-1:2; M represents one or more elements of which the atomic radius is greater than or equal to Ni and the electro-negativity is greater than Mg and smaller than Ni, z is more than or equal to 1 and less than or equal to 5, x is more than 0 and less than 3, and z is greater than x; T represents one or more elements of which the electro-negativity is greater than Mg and less than or equal to 1.7; and A represents an element of which the electro-negativity is 1.9-2.5, a is more than 0 and less than 3, d is more than 0 and less than 2, e is more than or equal to 0 and less than 1, a is greater than or equal to the sum of d and e, and a-d-e and e are not 0 at the same time. The magnesium-based hydrogen storage alloy material is an amorphous magnesium-based hydrogen storage material with high discharge capacity, good cycling stability and strong over-charge and over-discharge tolerance.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage, in particular to a magnesium-based hydrogen storage alloy material and a preparation method thereof. Background technique [0002] With the gradual depletion of fossil energy and the increasingly serious environmental pollution, the development of one or several clean new energy sources that can replace fossil energy is an urgent task for all mankind, especially for some countries that are poor in oil resources. For my country, the per capita share of fossil energy is very low, and the distribution is uneven, which is far from meeting the needs of my country's rapid economic growth. Moreover, due to the low level of productivity and insufficient energy utilization in our country, the pollution caused is extremely serious. my country accounts for more than half of the top ten polluted cities in the world. Therefore, it is of great practical significance to develop a clean new energy sys...

AI Technical Summary

Problems solved by technology

[0013] To sum up, previous studies based on the composition and structure of magnesium-based hydrogen storage alloys focused on substituting one or several elements for some elements in Mg-Ni alloys, but ignored the properties of the replacing elements themselves and the relationship between the properties of Mg-Ni alloys. The mutual synergy between and between the surface modification layers; surface modification (or coating), but ignores the interaction between the active layer and the magnesium-based hydrogen storage alloy, and ignores the catalytic life of the active center of the Mg-Ni alloy surface. As a result, the improved magnesium-based hydrogen storage alloy often only goes through 20-30 cycles or even a dozen cycles, and the improvement effect is completely exhausted.

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