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corresponding electrodes (SuperP® or Ketjenblack® based compositions) are presented on Figure 2-4. From a macroscopic point of view, the morphologies of both electrodes are rather the same. (a) (b) Figure 2-4. SEM pictures of sulfur positive electrodes (S/C/PVdF = 80/10/10 wt%) prepared with different carbon materials: (a) SuperP® and (b) Ketjenblack®, but with the same preparation method. Galvanostatic cycling (C/10) of both electrodes shows practically identical capacity retention over 50 cycles (Figure 2-5). Even if some electrodes display slightly higher/lower capacity, the values were still in the error margin previously discussed (see section 2.2.4). Initial capacity of ~ 650 mAh g-1 is followed by a drastic fading and stabilization at around 300 − 400 mAh g-1. Such capacity retention, with drastic fade just at the beginning, is very common to observe in Li/S cells35. Chapter 2: S8 electrode on Aluminum Figure 2-5. Galvanostatic cycling results (C/10) of sulfur electrodes (S/C/PVdF = 80/10/10 wt%) prepared with two different carbons, SuperP® (in red) and Ketjenblack® (in black). When replacing SuperP® by Ketjenblack®, which has specific surface area 13 times higher, no difference is found. Indeed, these results prove that, even if highly developed surface area is present, but not necessarily accessible for lithium polysulfides, no beneficial effect is obtained 50PDF Image | Accumulateur Lithium Soufre
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