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Synthèses de nanocarbones fluorés pour le stockage électrochimique de l'énergie

Abstract : For primary lithium batteries, the lithium anode can be coupled mainly four cathode materials (MnO2, SO2, SOCl2 and fluorinated carbons CFx). Li/CFx batteries have many inherent advantages such as high energy density (up to 2200, a moderately high discharge potential (about 2.4 V vs. Li+/Li) and a long life (over 10 years at room temperature). During this work, the electrochemical performances in primary lithium battery of nanostructured fluorinated carbons were investigated. To improve their performances, carbonaceous precursors with different dimensionalities, and various gas-solid fluorination methods were selected. Thus, a closed structure such as carbon nanofibres (1D, tubular), opened such as carbon nanodiscs/nanocones (2D in majority, discotic) and intermediate with graphitized carbon blacks have been chosen. Each synthesis route was optimized based on the starting material and their specificities, i.e. the shape factor, dimensionality, graphitization degree, stacking mode. To address to the limitations of commercial CFx materials, their discharge mechanism has been studied in order to improve the understanding about the electrochemical defluorination of a CFx cathode, and to compare it to original CFx synthesized in our laboratory, the main purpose is to exceed the current performances and to synthesize unrealized materials for primary lithium battery. Extracapacities in Li/CFx batteries were obtained with some specific fluorinated nanocarbon materials and their explanation was discussed.
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Submitted on : Thursday, December 12, 2013 - 3:37:09 PM
Last modification on : Wednesday, December 15, 2021 - 3:09:09 AM
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  • HAL Id : tel-00917849, version 1


Yasser Ahmad. Synthèses de nanocarbones fluorés pour le stockage électrochimique de l'énergie. Autre. Université Blaise Pascal - Clermont-Ferrand II, 2013. Français. ⟨NNT : 2013CLF22381⟩. ⟨tel-00917849⟩



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