Nanoscale compositional changes during first delithiation of Si negative electrodes
| Autor: | Bernard Lestriez, Magali Gauthier, Dominique Guyomard, Lionel Roué, Julien Danet, Philippe Moreau |
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| Přispěvatelé: | Institut National de la Recherche Scientifique [Québec] (INRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), CEA Grenoble (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Amorphous silicon
Materials science Nano-analysis Silicon 020209 energy Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte Electrochemistry chemistry.chemical_compound Silicon electrode Nano 0202 electrical engineering electronic engineering information engineering Li-ion battery Electrical and Electronic Engineering Physical and Theoretical Chemistry Electron energy-loss spectroscopy Renewable Energy Sustainability and the Environment Electron energy loss spectroscopy 021001 nanoscience & nanotechnology Lithium battery chemistry Chemical engineering Electrode [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Homogeneity 0210 nano-technology Li-Si alloy |
| Zdroj: | Journal of Power Sources Journal of Power Sources, Elsevier, 2013, 227, pp.237. ⟨10.1016/j.jpowsour.2012.11.047⟩ Journal of Power Sources, 2013, 227, pp.237. ⟨10.1016/j.jpowsour.2012.11.047⟩ |
| ISSN: | 0378-7753 1873-2755 |
| Popis: | International audience; The local composition of negative silicon electrodes is studied by ex situ electron energy-loss spectroscopy along the first delithiation in a lithium battery. By measuring dozens of sample areas for over a dozen compositions, the local and overall inhomogeneities in these practical electrodes are evaluated. The statistical treatment of the data highlights the existence of larger inhomogeneities at the beginning of the delithiation as well as at a 100 nm scale. It is also shown that, even if incremental capacity curves are different, the compositional changes during delithiation are identical for nano- and micro-Si. Namely, an initial Li15Si4 phase is replaced by a Li2±0.3Si amorphous phase in a biphasic process, the latter compound being further delithiated to amorphous silicon in single phase process. Results also show that the electrochemical irreversibility associated with the liquid electrolyte reduction/degradation is generated during the lithiation process, not the delithiation process. |
| Databáze: | OpenAIRE |
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