Hydrogenation and Discharge Capacity of a La_0.7Mg_0.3Al_0.3Mn_0.4Co_0.5Ni_3.8 Alloy for Nickel-Metal Hydride Batteries

Abstract:

The preparation of negative electrodes for nickel-metal hydride (Ni-MH) batteries using a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy in the as-cast state has been carried out. The alloy was mechanically crushed (<44 m) and a battery was manufactured with this material. The mean discharge capacity achieved using this method was 384 mAh/g. Another two batteries were prepared using a hydrogen powdered La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy at low and high pressures (2-10 bar). It has been shown that hydrogen powdering facilitates the activation of the negative electrode for Ni-MH batteries. This study also included the characterization of the hydrogenated and crushed powders. These materials were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

• Periodical: Materials Science Forum (Volumes 660-661)
• Pages: 128-132
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.660-661.128
• Online since: October 2010
• Authors: Julio César Serafim Casini, Lia Maria Carlotti Zarpelon, Eliner Affonso Ferreira, Hidetoshi Takiishi, R.N. Faria
• Keywords: EDX, Hydrogen Storage Alloy, La-Mg Based Metal Hydrides, Microanalysis, Ni-MH Battery

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DOI: 10.1016/s0925-8388(01)01475-x