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Rare-earth series hydrogen storage alloy

A hydrogen storage alloy and rare earth technology, which is applied in the direction of electrical components, alkaline battery electrodes, battery electrodes, etc., can solve the problems of great difficulty in selecting alternative elements, and the synergy has a great influence on the performance of the alloy, so as to improve the cycle Stability and fast charge and discharge performance, improvement of discharge capacity and cycle stability, and cost reduction effects

Inactive Publication Date: 2009-09-16
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many alloying elements that can be considered, and the synergistic effect between the constituent elements has a great influence on the properties of the alloy. It is very difficult to select the replacement elements when preparing hydrogen storage alloys.

Method used

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  • Rare-earth series hydrogen storage alloy
  • Rare-earth series hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical formula of the rare earth hydrogen storage alloy of the present embodiment is:

[0018] Ml 0.98 Dy 0.02 Ni 3.6 co 0.25 al 0.25 mn 0.4 Cu 0.1 Fe 0.1 sn 0.1 Cr 0.1 Zn 0.1 (Alloy A).

[0019] The mixed rare earth Ml used therein includes the following components in mass percentage: La 80%, Pr 7%, Ce 8%, Nd 5%.

[0020] The preparation method of the rare earth hydrogen storage alloy of the present embodiment is as follows:

[0021] Dysprosium (Dy), mixed rare earth Ml and nickel (Ni), cobalt (Co), aluminum (Al), manganese (Mn), copper (Cu), iron (Fe), zinc (Zn), chromium (Cr) and tin (Sn) were placed in a vacuum non-consumable electric arc furnace, smelted under the protection of argon, and smelted repeatedly for 5 times, and finally cooled by a water-cooled copper ingot mold to make a hydrogen storage alloy ingot.

[0022] The preparation of the hydrogen storage alloy electrode of this embodiment:

[0023] The prepared alloy ingot is mechanically...

Embodiment 2

[0027] The chemical formula of the rare earth hydrogen storage alloy of the present embodiment is:

[0028] Ml 0.95 Dy 0.05 Ni 3.8 co 0.15 al 0.35 mn 0.45 Cu 0.05 Fe 0.05 sn 0.05 Cr 0.05 Zn 0.05 (Alloy B).

[0029] The mixed rare earth Ml used therein includes the following components in mass percentage: La 90%, Pr 4%, Ce 4%, Nd 2%.

[0030] The preparation method and electrochemical performance detection method of the rare earth hydrogen storage alloy and electrode in this example are the same as in Example 1, and the hydrogen storage alloy electrode obtained in this example is marked as electrode B.

Embodiment 3

[0032] The chemical formula of the rare earth hydrogen storage alloy of the present embodiment is:

[0033] Ml 0.88 Dy 0.12 Ni 3.6 co 0.1 al 0.3 mn 0.25 Cu 0.15 Fe 0.15 sn 0.15 Cr 0.15 Zn 0.15 (Alloy C).

[0034] The mixed rare earth Ml used therein includes the following components in mass percentage: La 84%, Pr 10%, Ce 4%, Nd 2%.

[0035] The preparation method and electrochemical performance detection method of the rare earth hydrogen storage alloy and electrode in this example are the same as in Example 1, and the hydrogen storage alloy electrode obtained in this example is marked as electrode C.

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Abstract

The invention discloses a rare-earth series hydrogen storage alloy. The chemical formula of the alloy has the following general formula: Ml1-xDyx(NiaCobAlcMndCueFefSngCrhZni), wherein x is more than 0 and less than 0.3; a is more than 2 and less than 4; b is more than 0 and less than 0.3; c is more than 0.2 and less than 0.4; d is more than 0.2 and less than 0.5; e is more than 0 and less than 0.2; f is more than 0 and less than 0.25; g is more than 0 and less than 0.22; h is more than or equal to 0 and less than 0.18; and i is more than 0 and less than 0.28; and Ml is mixed rare earth. The alloy uses Cu, Cr, Zn, Fe and Sn to replace Co element in the rare earth series hydrogen storage alloy, can obviously improve the circulation stability of the hydrogen storage alloy, reduces the content of Co in the hydrogen storage alloy by over 60 percent compared with commercial hydrogen storage alloy MlNi3.55Co0.75Mn0.4Al0.3, and greatly reduces the production cost.

Description

technical field [0001] The invention relates to a rare earth hydrogen storage alloy. Background technique [0002] In the past ten years, due to the rapid development of products such as personal computers, mobile phones, electric tools and electric vehicles, the development of secondary batteries supporting them has been promoted, which makes the research and development of Ni-MH batteries have practical significance. However, it One of the key technologies is the research on the negative electrode material hydrogen storage alloy. Rare earth series AB 5 LaNi 5 、MmNi 5 (Mm: Ce-rich mixed rare earth), MlNi 5 (Ml: La-rich mixed rare earth) and other rare earth-based hydrogen storage alloys have a maximum hydrogen storage density of 14% (mass), and the rare earth oxide on the surface and the oxide / Ni interface on the subsurface layer are stable even at room temperature. It has the initial activation characteristics of dissociation of hydrogen molecules, so the electrochemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C19/05C22C30/00C22C30/02C22C30/04C22C30/06C22C28/00H01M4/38H01M4/24H01M4/52
CPCY02E60/124Y02E60/10
Inventor 李全安李克杰李守英张兴渊
Owner HENAN UNIV OF SCI & TECH
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