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Chapter 3: S8 electrode on NwC Figure 3-17. Initial cycle voltage profile of both electrodes, ‘S-on-Al’ and ‘S-on-NwC’ cycled at C/20 with only Celgard®2400 separator in the coin cell (without the Viledon®, as normally used). These results prove again that the porous structure of NwC permits an increase of the electrolyte amount near the active species, and probably facilitates the electrolyte penetration inside the whole electrode, which delays the species precipitation and provides good contact between sulfur particles and the electrolyte. Incorporation of NwC as a positive electrode current collector may thus allow to prevent the use of a thick non-woven like separators (such as Viledon®), by substituting the insulating 3D polymer network with a conducting one at the positive electrode for electrolyte absorptivity. This would in turn allow to gain even more in terms of energy density, as compared to Al-based cells. The role of NwC would may be then triple: (i) current collector, (ii) 3D network for positive electrode’s porosity and surface, and (iii) electrolyte reservoir. To conclude, the beneficial effect of NwC was already proven when looking at relatively highly loaded electrodes. The presence of this 3D porous conductive structure also permits to limit the polarization phenomena whatever the state of charge/discharge of the battery, and to improve the capacity (per g of sulfur). A schematic illustration on Figure 3-18 summarizes the benefits of NwC as current collector over classical Al foil. 93PDF Image | Accumulateur Lithium Soufre
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