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La charge rapide d'une batterie métal-air par la maîtrise de la fluidique diphasique

Abstract : The fast charge of metal-air batteries represent one of the main scientific and technical challenges facing this technology. Oxygen bubbles formed during the charge process has a negative impact on the performances of the cells. Using flowing electrolyte for the evacuation of oxygen bubbles leads to a decrease of the electric potential of the gas evolving electrodes. For a given current, the electrode has more active surface, decreasing its potential. Optical measurement under microscope shows the bimodal distribution of the bubbles sizes. This repartition trends to a uni-modal distribution when the flow rate of the electrolyte increases. Those electrochemical and optical characterizations bring information to develop an analytical modelling for the predictions of the dynamic behavior of these systems. A numerical simulation is also proposed to complete the analytical model. This simulation is able to reproduce the oscillatory behavior at high currents. The optimization of the energy efficiency of the process is done by calculating and choosing an optimal flow rate, corresponding to the best balance between the power gained and the hydraulic power consumed by the flow. The decrease of the hydraulic power needed is done by the adaptation of the geometry of the flow cells. Triangular configuration for the inlet and outlet zones of the flow are tested and shows better characteristics for natural and forced evacuation of the bubbles. A preliminary study and outlooks of the effect of flowing electrolyte on zinc dendrites are presented. Flowing electrolyte increase the time before a short-circuit occurs.
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Submitted on : Tuesday, February 16, 2021 - 12:07:16 PM
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Soufiane Abdelghani-Idrissi. La charge rapide d'une batterie métal-air par la maîtrise de la fluidique diphasique. Chimie-Physique [physics.chem-ph]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLS013⟩. ⟨tel-03142796⟩

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