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- W2019079310 abstract "At least 10 different parameters have been determined in situ as well as ex situ and statistically analyzed to study changes in the physicochemical properties of PbO2 electrodes during the cycle life of traction batteries. The specific surface area, water content, microporosity and delta capacity are significant and strongly correlated. These variables, together with the high-frequency resistance, monitor the state of the positive active material as a function of the charge/discharge cycle-life. Insignificant variations in the resistance/capacitance and the Warburg term during the cycle life suggest that the changes in the properties of positive active material are not associated with the deviation in electrochemical activity. A negative correlation between the water content and specific surface area supports the assumption that the water originates from hydrated crystals, hydroxyl groups or protons present in PbO2. A thermal decomposition mechanism has been proposed that suggests that the number of vacancies in the crystal lattice decreases with cycling and finally the positive active material attains an ideal structure. Furthermore, the area of intergrowth of crystals or necks (as proposed in the Kugelhaufen model) seems to exert a significant cause of the changes in the properties of PbO2 during the cycle life." @default.
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- W2019079310 date "1991-12-01" @default.
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- W2019079310 title "Studies on the physicochemical properties and performance characteristics of the PbO2 electrode" @default.
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- W2019079310 doi "https://doi.org/10.1016/0378-7753(91)80070-e" @default.
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