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Preparation method of AB5 type hydrogen-storage alloy used on MH-Ni battery

A hydrogen storage alloy and battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the cycle life of alloys, increasing the self-discharge of MH-Ni batteries, and difficult to eliminate, so as to improve the performance of hydrogen storage alloys and increase Effects of shelf performance and cycle life extension

Inactive Publication Date: 2010-07-14
鞍山鑫普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually metal manganese and cobalt are used in the preparation of hydrogen storage alloys, and the specific gravity of metal manganese (7.44g / cm 3 ) and the specific gravity of metal cobalt (specific gravity 8.90g / cm 3 ) and the melting point of metal Mn (1244°C) and the melting point of metal Co (1495°C) are quite different, especially the vapor pressure of metal Mn (133Pa at 1200°C) is much higher than the vapor pressure of metal Co (1200°C, 0.067Pa), so As a result, the element manganese volatilizes greatly during the high-temperature smelting process, the element Mn is easy to diffuse to the upper part of the melt, and the element Co is easy to diffuse to the lower part of the melt, resulting in deviation and segregation of the alloy composition, and the Mn element is stronger than other elements in the hydrogen storage alloy solidification process Both are prone to segregation, making the Mn composition in the alloy more unstable, and this segregation is difficult to eliminate during heat treatment
In addition, 32-40% rare earth metals need to be added in the preparation of hydrogen storage alloys, and rare earth metals contain more impurities, especially elements C and Mg, which have a greater impact on the performance of hydrogen storage alloys. High C and Mg content will not only reduce the cycle life of the alloy, but also increase the self-discharge of the MH-Ni battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Co-based alloy

[0026] Composition: Co 36%, Ni 26%, La 8%, Pr 6%, Nd 24%;

[0027] Preparation method: put the prepared raw materials in a vacuum induction melting furnace, evacuate to below 0.5Pa, then stop the vacuum, then fill in a certain amount of argon, start to energize the power, when all the raw materials are melted, refine 5 -30 minutes, the melt is poured into a water-cooled mold for rapid solidification.

[0028] (2) Mn-based alloy

[0029] Composition: Mn 35%, Ni 24%, Al 12%, La 29%;

[0030] Preparation method: put the prepared raw materials in a vacuum induction melting furnace, evacuate to below 0.5Pa, then stop the vacuum, then fill in a certain amount of argon, start to energize the power, when all the raw materials are melted, refine 5 -30 minutes, the melt is poured into a water-cooled mold for rapid solidification.

[0031] (3) AB for MH-Ni battery 5 Preparation of type hydrogen storage alloy:

[0032] The Mn-based alloy, Co-based alloy, ...

Embodiment 2

[0040] (1) Co-based alloy:

[0041] Composition: Co 40%, Ni 26%, La 9%, Pr 5%, Nd 20%;

[0042] The preparation method is the same as in Example 1.

[0043] (2) The composition of the Mn-based alloy is:

[0044] Composition: Mn 43%, Ni 27%, Al 15%, La 15%;

[0045] The preparation method is the same as in Example 1.

[0046] (3) AB for MH-Ni battery 5 Preparation of type hydrogen storage alloy:

[0047] The Mn-based alloy, Co-based alloy, mixed rare earth metal and metal Ni are proportioned according to the following weight percentages: Mn-based alloy 20%,

[0048] Co-based alloy 30%,

[0049] Mixed rare earth metals 15%,

[0050] Metallic Ni 35%,

[0051] Among them, mixed rare earth metal refers to the mixture of La 35%, Ce 55%, and Pr 10%;

[0052] Then, put the prepared raw materials together in a vacuum induction melting furnace, evacuate to 0.2Pa, fill with 0.03MPa argon, and then turn on the power. When all the raw materials are melted, ...

Embodiment 3

[0055] (1) Co-based alloy:

[0056] Composition: Co 38%, Ni 22%, La 11%, Pr 7%, Nd 22%;

[0057] The preparation method is the same as in Example 1.

[0058] (2) Mn-based alloys:

[0059] Composition: Mn 40%, Ni 28%, Al 14%, La 18%;

[0060] The preparation method is the same as in Example 1.

[0061] (3) AB for MH-Ni battery 5 Preparation of type hydrogen storage alloy:

[0062] The Mn-based alloy, Co-based alloy, mixed rare earth metal and metal Ni are proportioned according to the following weight percentages: Mn-based alloy 10%,

[0063] Co-based alloy 20%,

[0064] Mixed rare earth metals 25%,

[0065] Metallic Ni 45%,

[0066] Here, the mixed rare earth metal refers to a mixture of La 28%, Ce 52%, Pr 5%, and Nd 15%.

[0067] Then, put the prepared raw materials together in a vacuum induction melting furnace, evacuate to 0.4Pa, fill with 0.02MPa argon, and then turn on the power. When all the raw materials are melted, refine for 12 minutes...

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Abstract

The invention relates to a preparation method of an AB5 type hydrogen-storage alloy used on an MH-Ni battery, which adopts the technical scheme that an Mn base alloy 10 to 20 percent, a Co base alloy 20 to 30 percent, norium 15 to 25 percent and metal Ni 35 to 45 percent are mixed; the mixed materials are put in a vacuum induction melting furnace together, and then the furnace is vacuumized untilthe pressure is below 0.5Pa; argon gas is charged in the furnace, and then powder starts to be fed through electrifying; refining is performed for 5 to 30 minutes after the materials are melted down completely, and a fused mass is poured onto a water cooling die for solidification; and an solidified alloy block is put in a vacuum handling furnace and is processed through heat preservation for 4 to 10 hours under the temperature ranging from 900 to 1100 DEG C. The preparation method eliminates deflection and aliquation of Mn elements in the hydrogen-storage alloy, especially controls fluctuation of Mn components, reduces the contents of C and Mg impurities in the hydrogen-storage alloy, increases the charge retention capacity of the MH-Ni battery, and reduces the local action of the MH-Ni battery.

Description

technical field [0001] The invention relates to a recyclable green energy MH-Ni battery AB 5 The field of preparation method of type hydrogen storage alloy. Background technique [0002] With the advancement of science and technology, the demand for resources and energy is increasing. The earth's resources are limited, and the exploitation and use of these resources will pollute the environment. How to save resources and energy is a major issue before us. topic. In addition, the production and use of energy will also bring serious pollution to the environment, especially the production of CO and CO 2 The resulting greenhouse effect has seriously affected the survival of human beings, forcing people to develop and explore new energy fields. MH-Ni battery is a kind of green and recyclable energy, which has the characteristics of high discharge capacity, long cycle life and high current discharge. It has been widely used in industry and household, especially electric vehicle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C30/00H01M4/38
CPCY02E60/12Y02E60/10
Inventor 郭靖洪姜波孙朝林王长春
Owner 鞍山鑫普新材料有限公司
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