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Etude des mécanismes réactionnels mis en jeu lors d'une rupture de confinement d'une batterie Li-ion soumise à un essai abusif

Abstract : Many devices involve Li-ion batteries (cell phones, laptops, electric vehicles, airplanes…). As hazardous situations can occur during the life of the battery, it is of great importance to understand its behavior under abusive conditions (mechanical, thermal or electrical). In particular, the study of overcharge, which consists in forcing a current through the cell, can be very helpful in improving battery safety. Very few studies in the literature have focused on the chemical reaction mechanisms responsible for failure during overcharge. Nevertheless, this is of great interest because a Li-ion battery can produce reactions in a sealed container and thus appears as a very reactive system. In this study, experimental and numerical approaches were employed to understand the reaction mechanisms that occur during overcharge testing. Experiments consisted in studying:- the overcharge kinetics of a 35cm³ commercial battery at an initial state of charge (SOC) of 100%. The battery was maintained in a known volume and the gaseous sample was withdrawn continuously and at the end of the test. The main gaseous species (inert gases such as CO², flammable and toxic gases such as CO, H₂, solvent vapors) were identified and quantified by gas phase chromatography coupled with mass spectrometry and FTIR spectroscopy.- thermal stability of electrolytes in order to quantify the influence of the solvent in the total gas cell emission. Experimental results were compared with simulations based on thermodynamic and kinetic calculations carried out using a detailed reaction mechanism.
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Yann Carvalhais Fernandes. Etude des mécanismes réactionnels mis en jeu lors d'une rupture de confinement d'une batterie Li-ion soumise à un essai abusif. Chimie théorique et/ou physique. Université d'Orléans, 2018. Français. ⟨NNT : 2018ORLE2068⟩. ⟨tel-03407742⟩

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