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High-capacity hydrogen storage alloy electrode material and production method thereof

A technology for hydrogen storage alloys and electrode materials, applied in the field of materials, can solve problems such as obstacles to the market application of hydrogen storage alloys, and achieve the effects of easy industrialization and promotion, good high-rate discharge performance, and simple preparation process and equipment.

Active Publication Date: 2013-10-23
INNER MONGOLIA XIAOKE HYDROGEN STORAGE ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous studies, A 2 B 7 The rare earth elements in hydrogen storage alloys are mainly neodymium (Nd), and with the development of the market, the price of Nd elements is rising day by day. 2 B 7 The market application of type hydrogen storage alloys has caused obstacles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepared by vacuum induction melting furnace, the composition is ML 0.27 SM 0.62 Mg 0.11 Ni 3.37 Al0.06 co 0.08 The alloy ingots, melting process and adopted parameters are as follows:

[0035] Step 11: charging;

[0036] Put the raw materials weighed according to the designed composition into the melting crucible of the vacuum induction melting furnace, and the feeding sequence is: lanthanum-rich misch metal → metal Sm → metal Co → metal Ni → metal Al, lanthanum-rich misch metal, metal Sm, The weight percentages of metal Co, metal Ni, and metal Al are 11.2%, 27.6%, 1.4%, 58.5%, and 0.5%, respectively.

[0037] Step 12: Melting;

[0038] Vacuum to 1×10 before melting -2 Below MPa, fill in an appropriate amount of argon to keep the vacuum at about 0.06MPa. When smelting, first gradually raise the temperature to 1200°C-1350°C, and keep the power for 3 minutes to gradually melt the raw materials.

[0039] Step 13: refining and casting;

[0040] Then continue to h...

Embodiment 2

[0047] Prepared by vacuum induction melting furnace, the composition is ML 0.57 SM 0.22 Mg 0.21 Ni 3.07 Al 0.12 co 0.08 mn 0.2 alloy ingots. The melting process and the parameters used are as follows:

[0048] Step 21: charging;

[0049] First, put the raw materials weighed according to the designed composition into the melting crucible of the vacuum induction melting furnace, and the feeding sequence is: lanthanum-rich misch metal→metal Sm→metal Mn→metal Co→metal Ni→metal Al, lanthanum-rich misch metal , metal Sm, metal Mn, metal Co, metal Ni, and metal Al are respectively 25.2%, 10.4%, 3.5%, 1.5%, 56.8%, and 1.0% by weight.

[0050] Step 21: melting;

[0051] Vacuum to 1×10 before melting -2 Below MPa, fill in an appropriate amount of argon to keep the vacuum at about 0.06MPa. When smelting, first gradually raise the temperature to 1200°C-1350°C, and keep the power for 3 minutes to gradually melt the raw materials.

[0052] Step 23: refining and casting;

[0053...

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Abstract

The invention discloses a high-capacity hydrogen storage alloy electrode material which comprises the following chemical components in percentage by weight of 42-45 percent of La, 29-35 percent of Nd, 2-5 percent of Ce and 8-11 percent of Pr. The high-capacity hydrogen storage alloy electrode material has a chemical formula of ML1-x-ySmxMgyNizAlwCouMnv, wherein x is more than 0 and less than 6.7, y is more than 0 and less than 0.4, z is more than 3 and less than 4, w is more than 0.03 and less than 0.15, u is more than 0.03 and less than 0.15, v is more than 0.03 and less than 0.15, z+w+u+v is more than 3.1 and less than 4.2, and ML is a lanthanum-rich mixed rare earth metal. The invention also discloses a production method of the high-capacity hydrogen storage alloy electrode material. The high-capacity hydrogen storage alloy electrode material related in the invention has the advantages that the discharge specific capacity is 20-30 percent higher than that of a conventional AB5 type hydrogen storage alloy, and a good high-rate discharge property is achieved.

Description

technical field [0001] The invention relates to a material technology, in particular to a high-capacity hydrogen storage alloy electrode material and a production method thereof. Background technique [0002] The use of rare earth hydrogen storage alloys in nickel-hydrogen battery anode materials began in the 1980s, and the initial nickel-hydrogen battery anode materials used AB 5 Type hydrogen storage alloy, and showed excellent specific energy and cycle life in many secondary batteries at that time. However, with the development of society and the progress of the battery industry, AB 5 The nickel-metal hydride battery that type hydrogen storage alloy is anode material can't meet people's requirement to battery specific energy gradually. [0003] For example, Chinese patent CN1075380A discloses a new type of hydrogen storage alloy electrode material, which has good cycle stability, and its discharge specific capacity is about 280mAh / g; Chinese patent CN1078268A discloses ...

Claims

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Application Information

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IPC IPC(8): C22C19/03
Inventor 朱惜林赵鑫吉力强王永光李倩
Owner INNER MONGOLIA XIAOKE HYDROGEN STORAGE ALLOY CO LTD
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