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Habilitation à diriger des recherches

Management and Components for Advanced Lead-Acid Batteries

Abstract : The manuscript presents a series of works aimed to optimise the performance of the valve-regulated lead-acid battery (VRLAB) in terms of lifetime and energy and power density. The first direction includes the development of various battery management solutions based on the detailed comprehension of the lead-acid battery electrochemistry. The oxygen recombination current and the oxygen cycle efficiency were measured using a custom-made gassing rate monitoring system. The correlation between the proposed model and the measured data showed that the oxygen cycle is gas-diffusion limited process. It is demonstrated that the integration of reference electrodes for positive plate potential regulation during the charge is one of the best strategies for control over the oxygen cycle and prevention of the thermal runaway phenomenon. Further, the mechanism of the pulse charge of the lead-acid battery was studied separately on the positive and on the negative plate using electrochemical impedance spectroscopy. It is concluded that the pulse charge with a frequency close or equal to the characteristic frequency of the charge reaction leads to an electrochemical resonance corresponding to a maximum of the charge acceptance. The impact of the electrolyte on the positive plate electrochemistry is studied on small-scale “Planté” electrodes and on traction positive plates. It is found that sulphuric acid electrolytes with concentration higher than 5mol/l cause a passivation of the lead dioxide electrode. QCM electrode studies revealed that the passivation is caused by a solid-state PbO2 reduction mechanism taking place with proton insertion. The improvement of the specific power and energy of the battery was accomplished by the replacement of the traditional grids with innovative carbon honeycomb current collectors. They offer high ratio between the surface area of the grid and the quantity of the active materials as well as excellent compatibility with the AGM technology.
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Habilitation à diriger des recherches
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Contributor : Angel Kirchev Connect in order to contact the contributor
Submitted on : Friday, February 18, 2022 - 10:31:23 AM
Last modification on : Monday, February 21, 2022 - 9:02:13 AM
Long-term archiving on: : Thursday, May 19, 2022 - 6:33:06 PM


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  • HAL Id : tel-03579565, version 1




Angel Kirchev. Management and Components for Advanced Lead-Acid Batteries. Theoretical and/or physical chemistry. Université de Grenoble, 2013. ⟨tel-03579565⟩



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