SANS CHARACTERIZATION OF CORE-SHELL SILICON CARBON-COATED NANOPARTICLES USED AS ANODE MATERIALS FOR LITHIUM-ION BATTERIES
We have successfully synthesized, by laser pyrolysis technique, new core-shell silicon carbon-coated nanoparticles (Si@C-NPs) used as anode materials for lithium-ion batteries. This technique allowed producing Si nanoparticles (Si-NPs) in a very versatile manner. Indeed, we have synthesized either Carbon coated or naked NPs of different size as well as crystalline or amorphous Si core. We observed that Si@C material exhibited a high and stable capacity whereas the bare Si material obtained from the same synthesis showed a rapid capacity fading. Furthermore, amorphous Si@C shows even better performances, particularly in terms of coulombic efficiency. These results clearly showed that both the surface state and the crystallinity of the Si-NPs govern the electrochemical behavior of the material. The aim of the present SANS proposal is to investigate the shape, size, core-shell structure evolution of such promising NPs according to the elaboration process, at different stages of lithiation.
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LYONNARD Sandrine; COLIN Jean Francois; MENDIL JAKANI Hakima; MILLOT Coraline; PORCAR Lionel and SOURICE Julien. (2015). SANS CHARACTERIZATION OF CORE-SHELL SILICON CARBON-COATED NANOPARTICLES USED AS ANODE MATERIALS FOR LITHIUM-ION BATTERIES. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-101
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