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Einfluss von Phosphorsäure auf die Leistung einer Bleisäurezelle mit Antimon‐Gitter unter Ladung und Entladung bei konstanter Stromstärke
Author(s) -
Abd ElRahman H.A.,
Salih S.A.,
Abd ElWahab A. M.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100770
Subject(s) - phosphoric acid , chemistry , antimony , analytical chemistry (journal) , dielectric spectroscopy , capacitance , polarization (electrochemistry) , lead–acid battery , constant current , current (fluid) , electrode , inorganic chemistry , battery (electricity) , electrical engineering , electrochemistry , thermodynamics , chromatography , organic chemistry , power (physics) , physics , engineering
Effect of phosphoric acid on the performance of Pb‐1.7%Sb grid of lead‐acid cell is studied in 5 M H 2 SO 4 by cyclic galvanostatic polarization and impedance spectroscopy. An increase in capacitance to a maximum is recorded during the initial stages of the electro‐reduction of PbO 2 into Pb(II) compounds and attributed to concurrent compositional and dimensional changes. These changes include removal of O 2 bubbles, insertion of large amounts of H 2 SO 4 and H 2 O. Efficiency of PbO 2 formation decreases, while its rate of self‐discharge increases with increasing the charging current and in the presence of H 3 PO 4 . The charge capacity increases with increasing the discharging current due to the decrease in the self‐discharge. The charge capacity is lower in the presence of H 3 PO 4 . On increasing the cycle number, the corrodibility of the grid increases, because more layers of the surface Pb are involved in the self‐discharge. H 3 PO 4 significantly retards the effect of cycle number.