رسالة جامعية
Synthesis and characterization of oxyfluorinated disordered rocksalts as cathode materials for lithium batteries ; Synthèse et caractérisation de matériaux oxyfluorés à structure cubique face centrée désordonnée pour cathodes de batteries au lithium
| العنوان: | Synthesis and characterization of oxyfluorinated disordered rocksalts as cathode materials for lithium batteries ; Synthèse et caractérisation de matériaux oxyfluorés à structure cubique face centrée désordonnée pour cathodes de batteries au lithium |
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| المؤلفون: | de Windt, Sébastien |
| المساهمون: | Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA), Université Clermont Auvergne, Katia Guerin, Marc Dubois |
| المصدر: | https://theses.hal.science/tel-04480242Test ; Matériaux. Université Clermont Auvergne, 2023. Français. ⟨NNT : 2023UCFA0093⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2023 |
| المجموعة: | HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand / Université d'Auvergne) |
| مصطلحات موضوعية: | Oxyfluoride, Disordered material, Cathode, Elemental fluorine, Oxyfluorure, Matériau désordonné, Fluor moléculaire, [CHIM.MATE]Chemical Sciences/Material chemistry |
| الوصف: | The present PhD work is part of the global research on electro-chemical energy storage, and tackle to its level a major challenge faced by the current Li-ion battery industry: transitioning from the nickel-manganese-cobalt (NMC) cathode technology to cobalt-free, nickel-free materials.Cation-disordered rocksalts (CDRS) are a recent family of cathode active material which meets these requirements. Both the scientific community and the sponsor of the present work, Umicore, show strong interest in these materials, which however suffer from critical capacity fade after a few cycles. Nonetheless, their oxyfluorination was identified as an effective way to address this weakness. Thus, this work is about gas-solid fluorination, first applied to the manganese oxides precursors, then aiming for the effective synthesis of a Li_Mn_O_F-like CDRS.Innovative protocols were developed to efficiently collect critical information like activation temperatures or reactivity shifts, in order to target only relevant conditions when performing a series of syntheses. In addition, special attention was given to the characterization methodology, including control series, systematic cross-check of multiple techniques and development of dedicated analysis procedures. This document thus reports how the fluorination of MnO proceeds via a mechanism of pure insertion and leads to the formation of a collection of stable and finely tunable manganese oxyfluorides, including stoichiometric MnOF. It details how the fluorination of Mn3O4 and Mn2O3 leads to different oxyfluorides, according to a more complex mechanism. It discloses how the attempts to use all-solid-state reactions to insert lithium into manganese oxyfluorides lead to a systematic phase segregation between oxides and fluorides, and in opposition how the fluorination of lithium manganese oxides leads to oxyfluorides. Last, it reveals how one-pot fluorinations of mixed lithium and manganese precursors produced at least two compounds with no database records, the structure of which are ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| العلاقة: | NNT: 2023UCFA0093; tel-04480242; https://theses.hal.science/tel-04480242Test; https://theses.hal.science/tel-04480242/documentTest; https://theses.hal.science/tel-04480242/file/2023UCFA0093_DE_WINDT.pdfTest |
| الإتاحة: | https://theses.hal.science/tel-04480242Test https://theses.hal.science/tel-04480242/documentTest https://theses.hal.science/tel-04480242/file/2023UCFA0093_DE_WINDT.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.7E74A644 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |