Batterie tout solide pour application automobile : processus de mise en forme et étude des interfaces

Abstract : Next generation batteries expectations for electric vehicle are significant, whether in terms of autonomy, environmental impact, charging speed and cost. The all solid-state batteries with a non-flammable solid electrolyte, rather than the conventional liquid one, could meet those criteria.Garnet-type ceramic Li7La3Zr2O12 (LLZO) is a promising solid electrolyte given its good Li-ion conductivity, chemical and electrochemical stability. The major constraint is the need to densify the ceramic at high temperature in order to make it conductive. No standard method exists to build a dense all-solid cell with low interfacial resistance.In this context, the PhD work managed to optimize the solid-state synthesis protocol of the LLZO oxide and his densification by the hot-pressing technique. The conditions of symmetrical Li/LLZO/Li cell assembly allowed to study the Li-metal/LLZO interface and its impact on lithium plating/striping behavior. Feasibility of densifying a “half-cell” (composite cathode/LLZO) in one single step was also studied by adjusting the hot-pressing temperature and pressure parameters.
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Ognjen Hajndl. Batterie tout solide pour application automobile : processus de mise en forme et étude des interfaces. Science des matériaux [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAI026⟩. ⟨tel-02171564⟩

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