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In operando study of lithium batteries by coupling X-ray photoelectron spectroscopy and impedance spectroscopy

Abstract : Faced with the major industrial challenges in the field of electrochemical energy storage, a fundamental research effort on the materials involved and their interfaces is nowadays essential for a gain in performance, durability and safety.In this context, it is essential to understand the interfacial processes involved that induce the degradation of the lithium metal-electrolyte interface and lead to a decrease in Coulombic efficiency and promote dendritic growth.In this thesis, we propose a study coupling electrochemical techniques such as impedance spectroscopy with surface analysis techniques such as X-ray photo-emission spectroscopy to study the chemical and electrochemical reactivity between electrolytes and a lithium metal electrode.To this end, special attention has been paid to the ionic liquids based electrolytes, which have been proposed as solvents for lithium salts, particularly for their low saturation vapor pressure, which considerably increases the safety of the batteries thus designed.Finally, this work was devoted in particular to the development of operando XPS assemblies and measurements in order to follow the chemical evolution of the interfaces inside a battery in real time.
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Jorge Eduardo Morales Ugarte. In operando study of lithium batteries by coupling X-ray photoelectron spectroscopy and impedance spectroscopy. Chemical Physics [physics.chem-ph]. Université Grenoble Alpes, 2019. English. ⟨NNT : 2019GREAI082⟩. ⟨tel-02506388⟩

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