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Your search keyword '"Haon, Cédric"' showing total 4 results
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4 results on '"Haon, Cédric"'

1. Electrochemical and X-ray Photoelectron Spectroscopic Study of Early SEI Formation and Evolution on Si and Si@C Nanoparticle-Based Electrodes.

Author

Desrues, Antoine, De Vito, Eric, Boismain, Florent, Alper, John P., Haon, Cédric, Herlin-Boime, Nathalie, and Franger, Sylvain

Subjects
X-ray photoelectron spectroscopy, PHOTOELECTRON spectroscopy, IMPEDANCE spectroscopy, SOLID electrolytes, ELECTRODES, ANODES
Abstract

Carbon coatings can help to stabilize the electrochemical performance of high-energy anodes using silicon nanoparticles as the active material. In this work, the comparison of the behavior and chemical composition of the Solid Electrolyte Interphase (SEI) was carried out between Si nanoparticles and carbon-coated Si nanoparticles (Si@C). A combination of two complementary analytical techniques, Electrochemical Impedance Spectroscopy and X-ray Photoelectron Spectroscopy (XPS), was used to determine the intrinsic characteristics of the SEI. It was demonstrated that the SEI on Si particles is more resistive than the SEI on the Si@C particles. XPS demonstrated that the interface on the Si particles contains more oxygen when not covered with carbon, which shows that a protective layer of carbon helps to reduce the number of inorganic components, leading to more resistive SEI. The combination of those two analytical techniques is implemented to highlight the features and evolution of interfaces in different battery technologies. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Growth of bulk functionalized silicon nanowires: importance of the gaseous phase

Author

Keller, Caroline, Lapertot, Gerard, Bayle, Pierre-Alain, Reiss, Peter, Haon, Cédric, Chenevier, Pascale, Synthèse, Structure et Propriétés de Matériaux Fonctionnels (STEP), SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé (SYMMES), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Instrumentation, Material and Correlated Electrons Physics (IMAPEC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Magnetic Resonance (RM ), Modélisation et Exploration des Matériaux (MEM), Département de l'électricité et de l'hydrogène dans les transports (DEHT), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Société Chimique de France, Institut de Chimie du CNRS (INC)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de L'Energie Solaire (INES), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Chenevier, Pascale

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, Silicon, nanowires, disproportionation, reaction mechanism, [CHIM.MATE]Chemical Sciences/Material chemistry, silylenes
Abstract

International audience; Silicon nanowires (SiNWs) have remarkable properties allowing new applications. Forexample, Li-ion batteries performances can be significantly improved[1]. It is therefore interesting toproduce them in an easy and quantitative way, and our team recently patented a new innovative growthprocess in this way. It allows high yield and bulk production of SiNWs, thanks to a non-dangerousorganosilane precursor, a gold nanoparticle catalyst, and a sacrificial support in NaCl[2]. The assynthetized SiNWs are surface functionalized, which is very useful for making SiNWs/carboncomposites. With this new process, the SiNWs diameter is always close to 10 nm with a sharpdistribution; the reason is not clear. In the present work we focus on the reaction mechanism, with theaim to understand the size limitation and the way the functionalization is happening. Electronicmicroscopy on SiNWs after a short reaction time revealed that 2 distinct populations of SiNWs withdifferent diameters (6nm and 10nm) are formed separately at different reaction times. Also, by usingNMR spectroscopy and a scavenger, we show that silylenes are part of the process as reactionintermediates. The gaseous phase plays for sure a key role in the mechanism, and the understandingof the steps occurring there is fundamental for the tunability of the SiNWs.1. Chan C.K., Peng H., Liu G. McIlwrath K., Zhang X.F., Huggins R.A. and Cui Y., Nature Nano., 2008, 3, 31-342. Chenevier P., Reiss P., Burchak O., Method for Producing Silicon Nanowires, FR3022234 (A1), 2015

Published
2018

3. Multiscale Investigation of Silicon Anode Li Insertion Mechanisms by Time-of-Flight Secondary Ion Mass Spectrometer Imaging Performed on an In Situ Focused Ion Beam Cross Section.

Author

Bordes, Arnaud, De Vito, Eric, Haon, Cédric, Boulineau, Adrien, Montani, Alexandre, and Marcus, Philippe

Subjects
*SILICON, *SPECTROMETERS, *MASS spectrometry, *AUGER effect, *ELECTRON microscopy
Abstract

Considering its specific capacity, silicon is one of the most promising materials to replace graphite in lithium ion batteries anodes. However, its rapid capacity fading prevents its use in current batteries. Understanding lithiation and degradation mechanisms of silicon is important for improving its cyclability. In this work a novel approach is developed by using a focused ion beam implemented in the analysis chamber of a state-of-the-art time of flight secondary ion mass spectrometer. Detailed mapping of elements distribution, including lithium, inside a silicon particle or in the entire depth of the electrode, can thus be performed. During the first lithiation, a core-shell mechanism is observed and its evolution upon electrochemical cycling was examined. This mechanism is observed for all particles in the electrode, independently of their position. Cross analysis with Auger spectroscopy allowed Li concentration in the entire shell to be quantified. Fast lithiation paths getting through the pure silicon core have been evidenced by complementary scanning electron microscopy and transmission electron microscopy (TEM) analyses. Defects observed by TEM are supposed to contribute significantly in the Li diffusion inside the particle. This approach also provided evidence of lithium progressively trapped in Si particles after aging, in close relationship with capacity loss found for silicon anodes along cycling. [ABSTRACT FROM AUTHOR]

Published
2016
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4. Core-shell amorphous silicon-carbon nanoparticles for high performance anodes in lithium ion batteries.

Author

Sourice, Julien, Bordes, Arnaud, Boulineau, Adrien, Alper, John P., Franger, Sylvain, Quinsac, Axelle, Habert, Aurélie, Leconte, Yann, De Vito, Eric, Porcher, Willy, Reynaud, Cécile, Herlin-Boime, Nathalie, and Haon, Cédric

Subjects
*AMORPHOUS silicon, *CARBON, *NANOPARTICLES, *LITHIUM-ion batteries, *CRYSTAL structure, *PYROLYSIS
Abstract

Core-shell silicon-carbon nanoparticles are attractive candidates as active material to increase the capacity of Li-ion batteries while mitigating the detrimental effects of volume expansion upon lithiation. However crystalline silicon suffers from amorphization upon the first charge/discharge cycle and improved stability is expected in starting with amorphous silicon. Here we report the synthesis, in a single-step process, of amorphous silicon nanoparticles coated with a carbon shell (a-Si@C), via a two-stage laser pyrolysis where decomposition of silane and ethylene are conducted in two successive reaction zones. Control of experimental conditions mitigates silicon core crystallization as well as formation of silicon carbide. Auger electron spectroscopy and scanning transmission electron microscopy show a carbon shell about 1 nm in thickness, which prevents detrimental oxidation of the a-Si cores. Cyclic voltammetry demonstrates that the core-shell composite reaches its maximal lithiation during the first sweep, thanks to its amorphous core. After 500 charge/discharge cycles, it retains a capacity of 1250 mAh.g −1 at a C/5 rate and 800 mAh.g −1 at 2C, with an outstanding coulombic efficiency of 99.95%. Moreover, post-mortem observations show an electrode volume expansion of less than 20% and preservation of the nanostructuration. [ABSTRACT FROM AUTHOR]

Published
2016
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