Apport de la spectrométrie de masse en temps réel à l'étude de la dégradation thermique d'électrolytes de batteries lithium-ion au contact de matériaux d'électrode positive

Abstract : The use of lithium-ion batteries is now a technology of choice for the automotive sector especially for its use in hybrid and electric vehicles, due to a high density of energy available as well as a high power density necessary to the traction of a vehicle. However, due to the high on-board energy, the safety of such devices must be enhanced. It has been reported that under abusive thermal conditions the cumulative effect of degradation of a LiPF6-based electrolyte and the catalytic effect of positive electrode materials leads to the formation of fluoro-organic species such as 2-fluoroethanol. This thesis aims to deepen the understanding of the role of positive electrode materials towards the degradation of LiPF6-based electrolyte, in particular by studying the nature of the gases produced under abusive thermal conditions. To carry out this project, a device allowing an in situ analysis of the formed gases has been developed. The role of water on the formation of fluoro-organic species is also the subject of a particular attention. The influence of several positive electrode materials on the nature of the degradation products of the electrolyte has been demonstrated. This work allowed to evaluate the influence of different parameters on the thermal degradation of the electrolyte in order to predict the choice of the various constituents of a lithium-ion battery
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Theses
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http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2017_0120_GAULUPEAU.pdf
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https://hal.univ-lorraine.fr/tel-01761867
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Submitted on : Monday, April 9, 2018 - 2:28:51 PM
Last modification on : Wednesday, September 4, 2019 - 2:06:03 PM

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  • HAL Id : tel-01761867, version 1

Citation

Bertrand Gaulupeau. Apport de la spectrométrie de masse en temps réel à l'étude de la dégradation thermique d'électrolytes de batteries lithium-ion au contact de matériaux d'électrode positive. Génie chimique. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0120⟩. ⟨tel-01761867⟩

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