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Delpuech, N., Dupre, N., Moreau, P., Bridel, J.-S., Gaubicher, J., Lestriez, B. & Guyomard, D. (2016) Mechanism of Silicon Electrode Aging upon Cycling in Full Lithium-Ion Batteries. ChemSusChem, 9 841–848.
Added by: Richard Baschera (2016-06-01 11:41:25) Last edited by: Richard Baschera (2016-06-02 09:52:54) |
| Type de référence: Article DOI: 10.1002/cssc.201501628 Numéro d'identification (ISBN etc.): 1864-5631 Clé BibTeX: Delpuech2016 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, ST2E Mots-clés: anodes, fluoroethylene carbonate, Interphase, Li-ion cells, negative electrode, NMR, NMR spectroscopy, performance, photoelectron-spectroscopy, reaction mechanisms, self-discharge, silicon, solid-electrolyte, solid-electrolyte interphase, surface-chemistry Créateurs: Bridel, Delpuech, Dupre, Gaubicher, Guyomard, Lestriez, Moreau Collection: ChemSusChem |
Consultations : 1/570
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Understanding the aging mechanism of silicon-based negative electrodes for lithium-ion batteries upon cycling is essential to solve the problem of low coulombic efficiency and capacity fading and further to implement this new high-capacity material in commercial cells. Nevertheless, such studies have so far focused on half cells in which silicon is cycled versus an infinite reservoir of lithium. In the present work, the aging mechanism of silicon-based electrodes is studied upon cycling in a full Li-ion cell configuration with LiCoO2 as the positive electrode. Postmortem analyses of both electrodes clearly indicate that neither one of them contains lithium and that no discernible degradation results from the cycling. The aging mechanism can be explained by the reduction of solvent molecules. Electrons extracted from the positive electrode are responsible for an internal imbalance in the cell, which results in progressive slippage of the electrodes and reduces the compositional range of cyclable lithium ions for both electrodes.
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