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Etude des mécanismes de vieillissement des batteries Li-ion en cyclage à basse température et en stockage à haute température : compréhension des origines et modélisation du vieillissement

Abstract : In order to deepen the understanding of the aging mechanisms of Li-ion batteries, post-mortem investigations were performed on C/NMC Li-ion commercial cells. These autopsies revealed unexpected degradations that question current knowledge about the aging mechanisms of these cells. Thus, it appears that the parasitic reaction of Li metal depositions on the graphite electrode, nowadays associated in the literature with charging at low temperature and / or high C-rates, would have various origins depending on the chemistry and conditions of use of the battery. In this thesis work, local Li deposits were observed on cells aged in calendar at high temperatures, due to the apparition of dry areas. Paradoxically, under low temperature cycling conditions, this Li resulted from anode porosity hindrance. Besides, a semi-empirical aging model, taking into account cycling losses as well as those caused by the SEI growth and the biphenyl polymerization, is proposed. Finally, a method of identifying degradation modes using incremental capacity measurements has been undertaken, based on the potential shifts of each of the electrodes.
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https://tel.archives-ouvertes.fr/tel-01792293
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Submitted on : Tuesday, May 15, 2018 - 1:01:13 PM
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Bramy Pilipili Matadi. Etude des mécanismes de vieillissement des batteries Li-ion en cyclage à basse température et en stockage à haute température : compréhension des origines et modélisation du vieillissement. Energie électrique. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAI118⟩. ⟨tel-01792293⟩

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