Etude des propriétés d’électrolytes solides et d’interfaces dans les microbatteries tout solide : Cas du LiPON et des électrolytes soufrés

Abstract : The link between the structure and the electrochemicalproperties of thin-film electrolytes and the interface formed withthe cathode material LiCoO2 has been intensively studied bycoupling Electrochemical Impedance Spectroscopy (EIS) and X-rayPhotoelectron Spectroscopy (XPS). Nitrogen incorporation intoLiPON, reference solid-state electrolyte for microbatteries, ischaracterized by the formation of lithium and oxygen vacancies,increasing the lithium ions transport. A sulfide based thin filmelectrolyte called LiPOS has been developed by radiofrequencysputtering, with the incorporation of sulfur into the initial Li3PO4structure. The solid/solid interface between LiPON and LiCoO2 ischaracterized by a partial reduction of cobalt and oxidation ofLiPON, which is in all probability responsible of the increase of thecharge transfer resistance between the two materials.
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Submitted on : Wednesday, June 5, 2019 - 12:29:03 PM
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Pierrick Morin. Etude des propriétés d’électrolytes solides et d’interfaces dans les microbatteries tout solide : Cas du LiPON et des électrolytes soufrés. Mécanique des matériaux [physics.class-ph]. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAI003⟩. ⟨tel-02148248⟩

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