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Effect of Hydrogen Decrepitation Pressure on the Particle Size of Rare Earth Based Alloys for Ni-Mh Battery Production
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Effect of Hydrogen Decrepitation Pressure on the Particle Size of Rare Earth Based Alloys for Ni-Mh Battery Production

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Abstract:

This paper presents the results obtained from the hydrogenation and decrepitation of three LaNi-based alloys, La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8, La0.7Mg0.3Al0.3Mn0.4Cu0.5Ni3.8 and La0.7Mg0.3Al0.3Mn0.4Sn0.5Ni3.8, in the as-cast condition. The procedure for decrepitating the alloys to be used in the negative electrode of the batteries was carried out using a combination of various hydrogen pressures (2-9 bar) at room temperature. At 2 bar of H2 it was revealed that Co, Cu and Sn have influence on the microstructures of the hydrogenated alloys and on the efficiency of hydrogen decrepitation. None of these alloys required thermal heating to activate and start the hydrogen absorption process. The decrepitated materials were characterized by scanning electron microscopy (SEM). The electrochemical measurements were performed using the tested negative electrode between two Ni (OH)2 electrodes as a battery cell.

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Periodical:

Materials Science Forum (Volume 930)

Pages:

637-642

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.930.637

Citation:

Cite this paper

Online since:

September 2018

Authors:

Edson Pereira Soares, Julio César Serafim Casini, Ligia Silverio Vieira, Franks Martins Silva, R.N. Faria, H. Takiishi

Keywords:

Battery, Decrepitation, Microanalyses, Rare Earth, Transition Metal

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