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A low-temperature high-capacity mg‑re‑ni base a 2 B-type hydrogen storage alloy and preparation method thereof

A hydrogen storage alloy and high-capacity technology, which is applied in the field of hydrogen storage alloy materials, can solve the problems of poor cycle stability of hydrogen absorption and desorption, and achieve the effects of improving the kinetic performance of hydrogen absorption and desorption, improving cycle stability, and improving surface activity

Active Publication Date: 2017-09-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogen absorption and desorption cycle stability of ball-milled Mg-based alloys is poor, which has become an insurmountable bottleneck for its practical application.

Method used

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  • A low-temperature high-capacity mg‑re‑ni base a <sub>2</sub> B-type hydrogen storage alloy and preparation method thereof
  • A low-temperature high-capacity mg‑re‑ni base a <sub>2</sub> B-type hydrogen storage alloy and preparation method thereof
  • A low-temperature high-capacity mg‑re‑ni base a <sub>2</sub> B-type hydrogen storage alloy and preparation method thereof

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preparation example Construction

[0032] The invention provides a low-temperature high-capacity Mg-RE-Ni-based A 2 The preparation method of type B hydrogen storage alloy comprises the steps:

[0033] (1) Raw material preparation: according to the chemical formula Mg 25-x RE x Ni 10-y-z Ti y al z Dosing, where RE is at least one of the rare earth elements lanthanum, cerium, praseodymium, neodymium, samarium, and yttrium; x, y, and z are atomic ratios, 1<x<5, 1<y<3, 0.2<z <1, preferably x=3, y=2, z=0.6; the magnesium and rare earth in the composition of the chemical formula increase the burning loss by 5%-10% when proportioned, and the metal purity of the raw material is more than or equal to 99.5%.

[0034] (2) Smelting: The raw materials weighed in step (1) are smelted in a vacuum induction furnace, and the vacuum is first evacuated to 1×10 -2 -5×10 -5Pa, then pass in an inert gas of 0.01-0.1MPa as a protective gas, the protective gas is pure helium or helium+argon mixed gas, the volume ratio of the mi...

Embodiment 1

[0041] Example 1: Mg 22 Y 3 Ni 7.4 Ti 2 al 0.6

Embodiment 2

[0042] Example 2: Mg 24 La 1 Ni 8.8 Ti 1 al 0.2

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Abstract

The invention belongs to the technical field of hydrogen storage alloy materials, and particularly relates to a high-capacity Mg-RE-Ni-based A2B-type hydrogen storage alloy used for fuel cells and the preparation technology of the alloy. According to the hydrogen storage alloy, the amount of added A-side elements is increased for 25at.%; Mg is partly replaced by rare earth elements; Ni is partly replaced by Ti and Al; the chemical formula of the alloy is Mg25-xRExNi10-y-zTiyAlz, wherein the x, y, z in the formula are atomic ratios; x is greater than 1 and smaller than 5; y is greater than 1 and smaller than 3; z is larger than 0.2 and smaller than 1; and RE is one or more of the rare earth elements of lanthanum, cerium, praseodymium, neodymium, samarium and yttrium. The hydrogen storage alloy has high hydrogen storage capacity and fast hydrogen absorption and desorption dynamics; the hydrogen desorption temperature for a hydride is obviously lowered, and reversible hydrogen absorption and desorption can be performed at 200 DEG C; and the circulation stability for hydrogen absorption and desorption is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, in particular to a high-capacity Mg-RE-Ni-based A 2 Type B hydrogen storage alloy and its preparation technology. Background technique [0002] In recent years, vehicles driven by fuel cells have attracted great attention at home and abroad. However, its practical application has been greatly limited. Magnesium-based alloys are recognized as the most potential hydrogen storage materials due to their high hydrogen storage density and extremely rich resources. especially A 2 B-type Mg-based hydrogen storage alloys have been widely studied because of their low hydrogen desorption temperature and large hydrogen storage capacity, such as Mg 2 NeH 4 3.6wt.%, Mg 2 CoH 5 4.5wt.%, Mg 2 FeH 6 It is 5.4wt.%. These hydrides are very promising as hydrogen storage materials for fuel cells, especially Mg-Ni-based A 2 Type B hydrogen storage alloy. [0003] However, the polyc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C45/00H01M8/0232
CPCC22C23/00C22C23/06C22C28/00C22C30/00C22C45/00C22C45/005H01M8/0232Y02E60/50
Inventor 张羊换袁泽明祁焱郭世海赵栋梁张建福
Owner CENT IRON & STEEL RES INST
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