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Hernandez, R. C., Karkar, Z., Guyomard, D., Lestriez, B. & Roue, L. (2015) A film maturation process for improving the cycle life of Si-based anodes for Li-ion batteries. Electrochem. Commun. 61 102–105.
Added by: Laurent Cournède (2016-03-10 18:36:40) |
| Type de référence: Article DOI: 10.1016/j.elecom.2015.10.014 Numéro d'identification (ISBN etc.): 1388-2481 Clé BibTeX: Hernandez2015 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: binders, Carboxymethyl cellulose binder, Film maturation, Li-ion batteries, nanoparticles, negative electrodes, performance, roles, silicon, Silicon electrode, Surface Créateurs: Guyomard, Hernandez, Karkar, Lestriez, Roue Collection: Electrochem. Commun. |
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This study shows that storage for a few days in humid air before cell assembling of Si-carboxymethyl cellulose (CMC) composite electrode prepared with a slurry buffered at pH 3 has a major positive impact on its cycle life and coulombic efficiency. Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy analysis shows that water molecules in humid air partly convert the ester bonds between Si particles and CMC binder into less rigid hydrogen bonds, Complementary to cycling tests, scanning electron microscopy (SEM) observations suggest that the mechanical integrity of the film is better maintained for an optimal ratio of ester bonds to hydrogen bonds between Si particles and the CMC chains. Such a favorable impact of storage in humid air on the cycling behavior of a composite electrode for lithium battery was unexpected when compared to standard practices that show a detrimental aging of active electrode materials when exposed to water. (C) 2015 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |