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Optimisation de la cyclabilité de composites Si/C pour électrodes négatives d'accumulateurs Li-ion

Abstract : New technologies require more and more environment friendly sources of high energy density. Lithium-ion batteries seem to be the best solution for mobile and automotive applications. In order to meet the future energy requirements, new negative electrode materials are needed to replace carbon which has now reached a mature stage. Especially, silicon/carbon composites (Si/C) appear to be promising candidates to increase the energy density of batteries, but they still present poor capacity retention upon cycling. The improvement of Si/C composites cyclability is the subject of this thesis. The synthesis of Si/C composites by spray drying with polyvinyl alcohol as carbon precursor, followed by pyrolysis, is presented. The electrochemical performances are compared with those obtained for other composites, prepared by freeze drying and ball-milling. The intrinsic properties of the composites were modified in two different ways to improve their cyclability. First, we studied the effects of polyvinyl alcohol crosslinking, and then those related to the graphitization of carbon contained in these composites. The cyclability of Si/C composites can also be improved by changing the nature of the binder used during the electrodes preparation. The beneficial interest of using polyacrylic acid in replacement of polyvinylidene fluoride binder commonly used in Si/C based electrodes is shown.
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Cyril Paireau. Optimisation de la cyclabilité de composites Si/C pour électrodes négatives d'accumulateurs Li-ion. Autre. Université d'Orléans, 2012. Français. ⟨NNT : 2012ORLE2043⟩. ⟨tel-00802436⟩

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