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Chemical improvement method of performances of La-Mg-Ni serial hydrogen storage alloy

A hydrogen storage alloy, high-performance technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of reduced cycle life, loss of effective capacity, etc., to achieve good corrosion resistance, good electrical and thermal conductivity, not easy to powder effect

Inactive Publication Date: 2015-06-24
HEILONGJIANG FULONG BUILDING DECORATION ENG
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AI Technical Summary

Problems solved by technology

The study found that alkali treatment must strictly control the reaction conditions, otherwise the excessive corrosion of the alloy will lose part of the effective capacity, and the surface corrosion dents and cavities caused by long-term alkali treatment will accelerate the corrosion of the alloy and reduce the cycle life

Method used

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Embodiment Construction

[0012] Alloy samples are formulated according to the composition design of La0.54Pr0.1Gd0.2Mg0.16Ni3.3Co0.3Al0.1, and the purity of the metal used is above 99.5%. The surface of the metal sample is carefully polished to remove oxide film and impurities, and then smelted and annealing. The preparation of NaOH aqueous solution is to prepare NaOH aqueous solution with a mass fraction of 40%~45%. The hot alkali treatment process is to put the prepared alkali solution in a constant temperature magnetic stirrer, set the temperature at 90 ° C, and after the temperature is constant, pour the alloy powder into the alkali solution, stir and heat for 45 minutes. The alloy powder washing process first removes the lye by filtration and separation, then applies ultrasonic waves to the alloy powder, and finally uses the different sedimentation speeds in the aqueous solution to separate and remove impurities on the alloy surface with a centrifuge.

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Abstract

Hot alkali treatment affects the electrochemical performances of La-Mg-Ni serial A2B7 type hydrogen storage alloy electrodes. The hot alkali treatment is carried out after alloy melting annealing, so the content of nickel in the surfaces of alloy particles increases with the dissolving of La, Mg, Al and other elements in a surface layer to realize strong activation performances.

Description

technical field [0001] The invention relates to a performance improvement method of a hydrogen storage alloy, in particular to a performance improvement of a La-Mg-Ni series hydrogen storage alloy. Background technique [0002] In recent years, the basic research, development and application of hydrogen storage alloys have made remarkable progress, and have become an important branch in the field of functional materials. Among them, the Ni-MH secondary battery with AB5 mixed rare earth hydrogen storage alloy as the negative electrode material has achieved large-scale industrialization in my country. The intrinsic hydrogen storage capacity of the AB5 type alloy is low (1.4 wt%), and the discharge capacity of the commercial electrode alloy is close to its theoretical capacity limit (372 mAh / g), it is difficult to further improve it, and it is difficult to adapt to the Ni-MH battery further development. Therefore, the study of new high-capacity hydrogen storage electrode all...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/02C23G1/20H01M4/38
CPCY02E60/10
Inventor 杨维国
Owner HEILONGJIANG FULONG BUILDING DECORATION ENG
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