Banca de DEFESA: ERILENE GRANGEIRO TELES RIBEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ERILENE GRANGEIRO TELES RIBEIRO
DATE: 27/02/2023
TIME: 14:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

Synthesis and characterization of tri and tetrabasic lead sulfate and its application in lead-acid accumulators

KEY WORDS:

Lead-acid batteries; 3BS and 4BS additives; Capacity test; Active material yield.

PAGES: 59
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Lead-acid batteries have been used since more than a century in many applications. The longevity of the technology is explained by several factors, including reliability, safety, recyclability and relatively low cost. However, one of the biggest problems is the low energy density, related, partly to the high density of the components (Pb) and partly to the low effective use of the active material. Another problem is related to cycle life, partially related to the degradation of the positive electrode, which occurs both, by corrosion of the current collector and by disaggregation, or shedding of the positive active material. In this sense, improving the use of active material and searching for strategies to hinder the shedding of positive active material turns into increase in efficiency, considering the two aspects mentioned above. The use of additives in the production of positive paste, such as 3BS and 4BS seeds,can improve the durability and increase the effective use of the active material. These are the aspects studied in the present work: the synthesis of 3BS and 4BS and subsequent application as additives in paste preparation, and then the use as the positive electrode of prototypes of lead-acid cells. The synthesisof the additives was achieved by mixing industrially lead oxide with adequate amounts of H2SO4, in aqueous medium, at temperatures up to 100oC. The positive plates containing the additives were used in the manufacture of 2 V prototypes and the results showed an increase in the use of the active material, around 3%, which can be explained, at least in part, by the change in the porosity of the plate. Apparently modest, this improvement may result in a decrease in the use of raw material to produce positive plates, which can reach more than a million reais per year. The reduction of costs is an attribute always welcomed by the industry and justifies the efforts involved in the investigation. 

COMMITTEE MEMBERS:
Externo à Instituição - ALDO JOSE GORGATTI ZARBIN - UFPR
Presidente - 1301657 - ANDRE GALEMBECK
Interno - 1806089 - EDUARDO HENRIQUE LAGO FALCAO