Hydrogen storage electrode alloy for ni-mh secondary battery and preparation method thereof

A technology for electrode alloys and secondary batteries, which is applied in the field of hydrogen storage alloy materials, can solve the problems of poor electrochemical cycle stability of alloys and difficulty in meeting the requirements of Ni-MH batteries, etc., and achieves easy large-scale industrial production and simple preparation methods , Improve the effect of corrosion resistance

Active Publication Date: 2016-07-06
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical cycle stability of the alloy is poor, and it is difficult to meet the requirements of Ni-MH batteries.

Method used

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  • Hydrogen storage electrode alloy for ni-mh secondary battery and preparation method thereof

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preparation example Construction

[0027] The preparation method of the high-capacity, long-life hydrogen storage electrode alloy for Ni-MH battery of the present invention comprises the following steps:

[0028] A. Carry out weighing and proportioning according to the designed chemical formula atomic ratio. Since the melting point of magnesium and rare earth elements is relatively low and easy to volatilize, the burning loss should be increased by 5%-10% in the ratio, among which 8% for magnesium and 5% for rare earth are better;

[0029] B. Melting is carried out by induction heating, and the prepared raw materials are placed in a magnesia crucible. Except for magnesium, which is placed on the top layer of the crucible, other materials are added to the crucible in no particular order. After covering the furnace cover, vacuumize to 1×10 -2 -5×10 -5 Pa, and then filled with 0.01-0.1MPa inert protective gas, that is, helium or argon + helium mixed gas, the volume ratio of the mixed gas is about 1:1; the meltin...

Embodiment 1

[0034] Example 1: La 0.6 SM 0.15 Mg 0.22 Ti 0.03 Ni 3.4 Al 0.1 Si 0.07

Embodiment 2

[0035] Example 2: La 0.6 Nd 0.15 Mg 0.22 Ti 0.03 Ni 3.4 Al 0.1 Si 0.07

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Abstract

The invention discloses a hydrogen storage electrode alloy for a Ni-MH secondary battery and a preparation method thereof. The chemical formula is: RE1-xMgxTiyNizAlmSin; m≤0.15, 0.05≤n≤0.15. In addition to lanthanum, rare earth elements must also contain at least one of samarium, yttrium, neodymium, and praseodymium. The preparation method is to adopt induction heating and smelting under the protection of inert gas, inject the molten alloy directly into a water-cooled copper mold, and cool down to room temperature with the furnace under the protection of inert gas to obtain alloy ingots, which are uniformly annealed in a vacuum heat treatment furnace; in the alloy of the present invention Add titanium and silicon to improve the corrosion resistance of the alloy and improve the electrochemical cycle stability of the alloy. Make full use of rare earth elements, so that the alloy has good comprehensive electrochemical performance. The preparation process of the alloy is easy to master and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, and in particular provides a high-capacity and long-life RE-Mg-Ti-Ni-Al-Si system A for Ni-MH secondary batteries. 2 B 7 Type hydrogen storage electrode alloy and its preparation method. Background technique [0002] Ni-MH batteries are widely used in small electronic devices and hybrid vehicles due to their excellent performance, especially rare earth-based AB 5 Type hydrogen storage alloys have achieved large-scale industrialization in China and Japan. However, due to the low capacity of this alloy (its theoretical electrochemical capacity is only 372mAh / g), it is being challenged by lithium-ion batteries, especially in the field of small electronic devices, and the share of Ni-MH batteries is decreasing. [0003] Therefore, it is imminent to study a new high-capacity electrode alloy. [0004] In 1997, Japanese researchers Kadir.K and Kohno found that La 0.7 Mg 0....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/24H01M4/30C22C19/03C22C1/02C22F1/10
CPCC22C1/023C22C19/03C22F1/002C22F1/02C22F1/10H01M4/242H01M4/30H01M4/383Y02E60/10
Inventor 张羊换李保卫任慧平张胤胡锋刘卓成
Owner INNER MONGOLIA UNIV OF SCI & TECH
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