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Le concept d'électrodes liquides de carbone appliqué au domaine des batteries en flux : étude et application aux matériaux d'intercalation du lithium

Abstract : This project deals with flow batteries, which are very promising technologies for large scale energy storage, especially for intermittent energies. This work aims at developing new types of electrolytes with carbon particles to enhance power of batteries. This concept is called "liquid electrode" and is implemented in flow batteries with redox lithium intercalation particles in aqueous media. The first objective is to formulate the carbon electrolyte, with a good electronic conductivity (1-4 mS/cm) and a reasonable viscosity. A compromise is reached thanks to the study of the mixing procedure and the carbon type. Conductivity is also studied by impedance spectroscopy and in flow to visualize the strength of the carbon network. The electrolytes are then, tested in a ferrocyanide/iodine millifluidic battery. The conversion of the soluble species is compared with a modelisation. A particular attention is paid to the effect of the flow and the kinetic on the battery intensity. Finally, these carbon electrolytes are used in a particles-based flow battery. For example, a battery LiFePO4{MnO2 demonstrates in flow, an intensity recovery between 5 et 30 mA{cm2 which is around 10 to 100 times higher than values reported in literature.
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https://tel.archives-ouvertes.fr/tel-01680250
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Submitted on : Wednesday, January 10, 2018 - 2:50:09 PM
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Hélène Parant. Le concept d'électrodes liquides de carbone appliqué au domaine des batteries en flux : étude et application aux matériaux d'intercalation du lithium. Chimie-Physique [physics.chem-ph]. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0726⟩. ⟨tel-01680250⟩

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