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Hydrogen storage electrode alloy for Ni-MH secondary battery and preparation method thereof

A secondary battery and electrode alloy technology, 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, and achieves easy large-scale industrial production and simple preparation methods , tissue and structural homogeneity

Active Publication Date: 2014-03-19
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
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  • Description
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  • 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

[0028] 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:

[0029] 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;

[0030] 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 0.01-0.1 MPa inert protective gas, that is, helium or argon + helium mixed gas, the volume ratio of the mixed gas is about 1:1; the mel...

Embodiment 1

[0035] 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

[0036] 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 hydrogen storage electrode alloy has a chemical formula of RE1-xMgxTiyNizAlmSin, wherein x is more than or equal to 0.2 and less than or equal to 0.3; y is more than or equal to 0.02 and less than or equal to 0.08; z is more than or equal to 3.0 and less than or equal to 3.5; m is more than or equal to 0.05 and less than or equal to 0.15. In addition to lanthanum, the rare earth elements also contain at least one out of samarium, yttrium, neodymium and praseodymium. The preparation method comprises the following steps: adopting induction heating and smelting under inert gas shielding, directly injecting the molten alloy into a water-cooled copper mold, performing furnace cooling to room temperature under inert gas shielding to obtain an alloy ingot, and uniformly annealing in a vacuum heat treatment furnace. Titanium and silicon are added into the alloy, so that the corrosion resistance of the alloy is improved, and the electrochemical cycling stability of the alloy is improved. The rare earth elements are fully utilized, so that the alloy has high comprehensive electrochemical properties. The preparation process of the alloy is easy to master and suitable for large-scale production.

Description

[0001] technical field [0002] 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 [0003] 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 372 mAh / 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. [0004] Therefore, it is imminent to study a new high-capacity electrode alloy. [0005] In 1997, Japanese researchers Kadir. K and Kohno found that La ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/24H01M4/30C22C19/03C22C1/02C22F1/10
CPCY02E60/124C22C1/023C22C19/03C22F1/002C22F1/02C22F1/10H01M4/242H01M4/30H01M4/383Y02E60/10
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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