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3.2. Preparation of the electrodes Two kinds of electrodes were prepared with the use of NwC as current collector: a) A composite electrode (named as ‘S-on-NwC’), with classical ink composition of 80/10/10 wt% (sulfur/SuperP®/PVdF 5130), coated onto NwC instead of Al foil sheet, using doctor blade technique. Due to the fact that NwC sheet is not perfectly homogenous, the weight of Ø 14 mm disks may oscillate in the range of 14.7 mg ± 1.0 mg. Such significant discrepancy may lead to an important error of the active mass determination in the final electrode. Therefore, the preparation route had to be slightly modified as compared to the preparation method of Al- based electrodes, in order to know precisely the weight of each NwC disk before the ink was coated. A schematic illustration (Figure 3-2) shows the steps of the electrode fabrication. Chapter 3: S8 electrode on NwC Figure 3-2. Schematic illustration of modified procedure for the electrodes fabrication, when using NwC sheet as a current collector, in order to minimize uncertainty of the current collector mass. The ink preparation and the drying procedure were exactly the same as for the Al-based electrodes (preparation described previously in 2.2.1). In this particular case, the ink viscosity and the speed of doctor blade coating were playing relatively important role on the final electrode’s morphology. It was thus necessary to optimize those parameters to find the best combination. Too liquid ink casted too slowly may risk in the ink penetration through the whole thickness of NwC up to the other side. The targeted loadings were between 3.9 to 5.0 mgSulfur cm-2 (theoretical areal capacities of 6.5 to even 8.4 mAh cm-2). Effective thickness was about 270 ± 10 μm (considering ~ 210 μm of NwC, a ~ 60 μm thick electrode was deposited on the surface, while some part of the ink penetrated into the porosity of NwC). These composite electrodes were mostly the interest of 73PDF Image | Accumulateur Lithium Soufre
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