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Ligneel, E., Lestriez, B., Hudhomme, A. & Guyomard, D. (2007) Effects of the solvent concentration (solid loading) on the processing and properties of the composite electrode. J. Electrochem. Soc. 154 A235–A241.
Added by: Laurent Cournède (2016-03-10 22:02:31) |
| Type de référence: Article DOI: 10.1146/1.2431316 Numéro d'identification (ISBN etc.): 0013-4651 Clé BibTeX: Ligneel2007b Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: battery performance, carbon-black, Cathodes, Electrochemical performance, graphite particles, kinetics, poly(vinylidene fluoride), rubber, sedimentation, surface-morphology Créateurs: Guyomard, Hudhomme, Lestriez, Ligneel Collection: J. Electrochem. Soc. |
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For various composite electrodes with the same composition 80(73 wt \% Li1.1V3O8, 8 wt \% CB, 19 wt \% PMMA)-20(EC-PC), and made by the solvent casting technique, the cycled capacity varies between 100 and 250 mAh/g depending on the initial volatile solvent concentration. For a concentration below the optimal one, the electrode dispersion exhibits a yield stress that inhibits flow and prevents homogeneous distribution of the constituents. Above the optimal concentration, settling of the particles in the low viscosity dispersion can create a concentration gradient. Below and above the optimal solvent concentration, the electrochemical performance is degraded due to poor electronic wiring of the active material. A generalization of this work to other materials and composite electrode formulations is discussed. In particular, satisfactory prediction of settling rate has been achieved using relations derived from Stokes' law and material parameters. (c) 2007 The Electrochemical Society.
Added by: Laurent Cournède |