Accumulateurs Li/S : barrières organiques à la réactivité des polysulfures

Abstract : The objectives of this thesis work were to explore new strategies to improve the performance of Li / S accumulators, systems exhibit with high theoretical energy densities whose performance is limited by an electrochemical mechanism including soluble and reactive intermediates. These intermediates induce a low coulombic efficiency and a significant loss of capacity during cycling. Several strategies have been evaluated to create a barrier of organic nature, which mitigate the transport or the reactivity of these polysulfides. The solutions explored are versatile and simple to implement. Good results have been obtained in terms of coulombic efficiency and cyclability, in particular through the use of a polymeric material enables to form ionic interactions with the sulfur intermediates. The mechanism of lithium deposition and dendritic growth has also been studied, for a more complete understanding of the system.
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Valentin Vinci. Accumulateurs Li/S : barrières organiques à la réactivité des polysulfures. Science des matériaux [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2018. Français. 〈NNT : 2018GREAI043〉. 〈tel-01868315〉

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