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Method for improving hydrogen storing property of AB2 type hydrogen storing alloy

A hydrogen storage alloy, AB2 technology, applied in the field of improving the hydrogen storage performance of AB2 type hydrogen storage alloy, can solve the problems of poor kinetic performance of hydrogen absorption and desorption, low discharge capacity, high cost, etc.

Inactive Publication Date: 2007-09-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The commercialized rare earth 1:5 type hydrogen storage alloy has excellent chemical formation performance and hydrogen absorption and desorption cycle stability, but the discharge capacity is low, which hinders its application in high-power power batteries; Mg-based and V-based alloys Although the capacity is high, the hydrogen absorption and desorption kinetics of the former are poor, and hydrogen absorption and desorption can only be reversed at a temperature above 200 ° C. The cost of the latter is too high and the cycle stability is poor; the Zr-based 1:2 alloy also has a higher capacity. , but its longer formation cycle and lower rate performance are the bottlenecks for practical application; although the new 1:3 type (not 1:5 type) alloy has improved capacity on the basis of the 1:5 type alloy, its cyclic cracking Serious, hindering the process of practical application
In comparison, the Ti-based 1:2 type alloy has a higher capacity, is easier to form, and has good rate performance, but poor cycle stability [Xu YH, et al.Trans Nonferrous MetSoc China 2001; 3:350.Skowronski JM, et al. J Solid Electrochem 2002;7:11.]

Method used

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  • Method for improving hydrogen storing property of AB2 type hydrogen storing alloy
  • Method for improving hydrogen storing property of AB2 type hydrogen storing alloy
  • Method for improving hydrogen storing property of AB2 type hydrogen storing alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The design alloy composition is: (Ti 0.65 Zr 0.35 )(V 0.5 mn 0.3 Cr 0.4 Ni 0.8 ), the purity of the raw materials used in the experiment is more than 99.9%, and then the Nb powder with a purity of more than 99.9% is added to replace part V, and the proportioning becomes an alloy (Ti 0.65 Zr 0.35 )(V 0.5-x mn 0.3 Cr 0.4 Ni 0.8 )Nb x (X=0.1~0.5), using WK-II type non-consumable (tungsten electrode) vacuum electric arc furnace to melt the alloy. In order to ensure the composition and structure uniformity of the alloy ingot and inhibit segregation, the ingot was remelted four times. As shown in Figure 1 (Ti 0.65 Zr 0.35 )(V 0.5-x mn 0.3 Cr 0.4 Ni 0.8 )Nb x (X=0.1~0.5) The X-diffraction pattern of the hydrogen storage alloy shows that with the increase of the Nb content, the position of the diffraction peak of the main phase shifts slightly to the left (the direction of the decrease of the diffraction angle), which indicates that the unit cell of the main ph...

Embodiment 2

[0017] The design alloy composition is: TiZr 0.35 V 0.5 mn 0.3 Cr 0.4 Ni 0.8 , the purity of the raw materials used in the experiment is above 99.9%, and then Nb powder with a purity above 99.9% is added to replace part V, and the proportion becomes alloy TiZr 0.35 V 0.5-x mn 0.3 Cr 0.4 Ni 0.8 Nb x (X=0.1~0.3), using WK-II type non-consumable (tungsten electrode) vacuum electric arc furnace to melt the alloy. In order to ensure the composition and structure uniformity of the alloy ingot and suppress segregation, the ingot was remelted four times. TiZr 0.35 V 0.5-x mn 0.3 Cr 0.4 Ni 0.8 Nb x (X=0.1~0.3) The activation performance curve of the hydrogen storage alloy is shown in Figure 3. It can be seen from the figure that as the amount of Nb replacing V increases, the electrochemical capacity of the alloy first increases and then decreases. When x=0.2 , the discharge capacity of the alloy reaches a maximum value of 404mAh / g. The number of activations changed litt...

Embodiment 3

[0019] The design alloy composition is: TiMn 1.2 Cr 0.8 , the purity of the raw materials used in the experiment is above 99.9%, and then Nb powder with a purity above 99.9% is added to replace part of Cr, and the proportion becomes the alloy TiMn 1.2 Cr 0.8-x Nb x (X=0.1~0.5), using WK-II type non-consumable (tungsten electrode) vacuum electric arc furnace to melt the alloy. In order to ensure the composition and structure uniformity of the alloy ingot and inhibit segregation, the ingot was remelted four times. TiMn 1.2 Cr 0.8-x Nb x (X=0.1~0.5) The cycle stability curve of the hydrogen storage alloy is shown in Figure 4. It can be seen from the figure that as the amount of Nb replacing Cr increases, the electrochemical cycle stability of the alloy first increases and then decreases. When x When =0.1, the best cycle stability of the alloy is 92.55%.

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Abstract

The invention discloses a modifying method of AB2-typed hydrogen-reserving property of hydrogen-reserving alloy in the alloy making technical domain, which is characterized by the following: designing each component of AB2-typed hydrogen-reserving alloy with purity over 99.9%; adding Nb element to allocate into new alloy; adopting non-consumable (tungsten electrode) vacuum arc furnace to fuse alloy; guaranteeing the casting component and tissue uniformity; inhibiting gravity segregation; adopting Zr and Ti as atom A and Cu, Fe, Ni, Mn, Cr, Co, V, Pd and Nd as atom B; adding Nb element to change microscopic structure and tissue shape of hydrogen-reserving alloy; improving the stability of hydrogen-reserving property effectively.

Description

technical field [0001] The present invention relates to an improved AB 2 The invention discloses a method for the hydrogen storage performance of a type hydrogen storage alloy, belonging to the technical field of alloy preparation. The alloy powder prepared by the method has good hydrogen storage performance. Background technique [0002] Hydrogen storage alloys are widely used in hydrogen purification, storage, transportation, compression, separation, storage batteries, heat pumps, air conditioners, organic hydrogenation or dehydrogenation, and other fields. Ni / MH battery has been developed rapidly recently due to its superior performance and environmental protection characteristics, and will gradually replace Ni / Cd battery and become the mainstream secondary battery. The further development of Ni / MH battery depends on the development level of its anode material - hydrogen storage alloy. The principle of metal hydride hydrogen storage is the reversible reaction between h...

Claims

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Application Information

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IPC IPC(8): C22C1/02B22D21/00C22C30/00
Inventor 张婷婷于荣海潘崇超
Owner TSINGHUA UNIV
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