AB3-type hydrogen storage alloy and preparation method

A technology of hydrogen storage alloys and alloy ingots, which is applied in the fields of metallurgical chemistry and electrochemical research, can solve the problems of unsatisfactory practical application and poor cycle life, and achieve the effect of improving electrochemical reactivity and improving cycle life

Inactive Publication Date: 2012-09-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle life of AB3 alloys in strong alkaline ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] AB 3 The composition of the type hydrogen storage alloy is: La 0.35 PR 0.30 Mg 0.30 Ni 2.90 Al 0.30 .

[0013] (1) 99.9% analytically pure metal elemental raw material, according to the chemical formula La 0.35 PR 0.30 Mg 0.30 Ni 2.90 Al 0.30 weighing ingredients;

[0014] (2) Melting the metal elemental raw materials except magnesium in step (1) in a copper mold in a magnetic levitation furnace to obtain an intermediate alloy;

[0015] (3) After pulverizing the intermediate alloy obtained in step (2), mix it with the magnesium weighed in step (1) and put it into a magnesium oxide crucible in a vacuum induction melting furnace, vacuumize it, fill it with high-purity argon, heat and cast it, The molten alloy is poured into a cold water copper mold for cooling to obtain an alloy ingot; after the alloy ingot is mechanically crushed, it is ball milled at a speed of 230 rpm for 50 minutes, and the 200-300-mesh particle powder is sieved for negative electrode pr...

Embodiment 2

[0018] AB 3 The composition of the type alloy is changed to La 0.35 PR 0.30 Mg 0.35 Ni 2.90 Al 0.30 , and the rest are the same as in Example 1.

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Abstract

The invention discloses an AB3-type hydrogen storage alloy and a preparation method. The chemical formula of the AB3-type hydrogen storage alloy is La0.35Pr0.30MgxNi2.90Al0.30, wherein x=0.30-0.35. The preparation method includes steps of (1), weighing and batching 99.9% of analytically pure metal elementary substance materials according to the chemical formula La0.35Pr0.30MgxNi2.90Al0.30 with the x ranging from 0.30 to 0.35; (2), smelting the metal elementary substance materials except magnesium in the step (1) in a copper mold in a magnetic levitation furnace to obtain intermediate alloy; (3) breaking the intermediate alloy obtained from the step (2), mixing the broken intermediate alloy with the magnesium weighed in the step (1) and placing the mixture into a magnesia crucible of a vacuum induction furnace, filling argon after vacuumizing, heating and smelting, pouring molten alloy into the cool water copper mold and cooling the alloy to obtain alloy ingots, breaking the alloy ingots mechanically, and finally treating the broken alloy ingots by ball milling for 30-60 minutes at a revolution speed of 225-250 turn/minute. The service life of alloy electrodes prepared by the preparation method is prolonged and electrochemical reaction activity thereof is improved.

Description

technical field [0001] The invention relates to the fields of metallurgical chemistry and electrochemical research, in particular to an AB 3 Type hydrogen storage alloy and preparation method thereof. Background technique [0002] The current anode material for nickel metal hydride batteries uses LaNi 5 alloy, the specific capacity reaches 320~340 mAh / g, which is close to the theoretical capacity, and it is difficult to further increase its capacity. AB 3 The La-Mg-Ni-based alloy is considered to be the most potential alloy material, which has excellent hydrogen storage function, discharge capacity as high as 360~410 mAh / g, and is environmentally friendly. but AB 3 Type alloys have poor cycle life in strong alkaline electrolytes and cannot meet practical applications. The adjustment of the composition ratio is an important means to improve the properties of the alloy. n B m One or more alloying elements are added to the alloy to improve the hydrogen storage perfor...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/03
Inventor 黄红霞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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