Efeito do óxido de grafite sobre o material precursor de placas negativas de bateria chumbo-ácido.

Abstract

Lead-acid batteries have been evolving since their invention in 1859 by Gaston Planté. Faced with the challenge of new applications and competition with other battery technologies, much research has been carried out and one of the most studied themes is the use of carbon additives to avoid the sulfating of the negative lead-acid battery plate when it operates under partial load conditions (in hybrid and electric vehicles and in the storage of renewable energy).The present course completion work is linked to this theme and aims to characterize the precursor material of negative lead-acid battery plate. For this, the following techniques were used: water absorption method to determine macroporosity; surface area and porosity analysis; infrared spectroscopy; and thermogravimetric analysis. Based on the technical roads used for characterization, it is observed that macroporosity varies linearly along the concentrations of 0.5 to 5.0% of graphite oxide, when the pore percentage values are observed. In the analysis of surface area and porosity and it is possible to observe an increase when the addition of graphite oxide occurs in comparison to the material without additive, it is not feasible to establish a correlation between the values of area and the concentration of additive. In infrared spectroscopy, in the case of graphite oxide, hydroxyl group is observed in the region around ~3600 cm-1,o-H elongation vibration, at 1500 to 1000 cm-1 the vibration C=O, the deformation =C-H and the connections of type : C=C; C-OH; C-O-C. For the precursor material and pbo has a band in common, the band of 1400 cm-1 that and characteristic of hydrocerrussite is precisely in this range. In infrared spectroscopy, in the case of graphite oxide, hydroxyl group is observed in the region around ~3600 cm-1,o-H elongation vibration, at 1500 to 1000 cm-1 the vibration C=O, the deformation =C-H and the connections of type : C=C; C-OH; C-O-C. For the precursor material and pbo has a band in common, the band of 1400 cm-1 that and characteristic of hydrocerrussite is precisely in this range. Based on the analyses performed it was possible to observe that the addition of graphite oxide to the precursor material of the negative plates of lead-acid battery appears to be promising.