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Similar observation was found when applying different pressures on ‘S-on-NwC’ composite electrodes. Lower discharge capacity was obtained for highly pressed electrode (pressing with 5 tons resulted in a thickness of 135 μm; not-pressed electrode was having a thickness of 270 μm). 3.4.9. Binder-free ‘melted sulfur-NwC’ electrodes performances The fact of using a porous carbon collector and the low melting temperature of sulfur allowed us to simply prepared, binder-free electrodes (preparation procedure described in section 3.2), further named as ‘S-melted’ electrodes. The morphology of these electrodes are shown on the SEM photos (Figure 3-25), and is quite different from the ‘S-on-NwC’ electrodes (i.e. when the ink is composed of S/SuperP®/PVdF and casted on NwC). Figure 3-25. SEM photos of sulfur electrode prepared by melting elemental sulfur onto NwC disk (a, b, c), in comparison with the standard composite ‘S-on-NwC’ electrode (d). It can be seen that sulfur after melting is not uniformly distributed on the NwC disk’s surface. It looks like melted sulfur fulfilled empty spaces between the carbon fibers (Figure 3-25b,c). The main difference seems to lie in the active material distribution and S/C contact. ‘S-on- NwC’ being composed of sulfur particles nicely coated by SuperP® particles and enrobed by PVdF binder, while sulfur in ‘S-melted’ electrode being much less in contact with carbon (only Chapter 3: S8 electrode on NwC 101PDF Image | Accumulateur Lithium Soufre
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Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
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