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with few NwC fibers) (Figure 3-25c). In this case, the only conductive surface area is provided by NwC fibers (~ 7.1 cm2). ‘S-melted’ and ‘S-on-NwC’ electrodes were prepared with almost identical sulfur loadings for better comparison (~ 4.5 mgSulfur cm-2) . XRD pattern confirms the presence of orthorhombic sulfur. However, additional peaks were observed, which were attributed to the monoclinic β-Sulfur (PDF-2; no. 01-071-0137). Appearance of another allotropic form is related with the fact that sulfur quickly solidified after melting20, and it appeared in another form, next to the major orthorhombic one. Figure 3-26 shows the cycling performances of the three cells for comparison: ‘S-on-NwC’ composite electrode, ‘S-melted’ and ‘catholyte’ cells, all cycled at C/20. (a) (b) (c) Figure 3-26. Galvanostatic cycling results obtained from three NwC-based electrodes, with different forms of active material: pure sulfur deposited on NwC fibers by melting (in black), composite S/SuperP®/PVdF coated on NwC collector (in red), and ‘catholyte’ cell (in green). Comparison of initial cycle voltage profiles (a) and capacity retention with respect to mAh gsulfur-1 (b) and mAh cm-2 (c). It is interesting to see that rather good initial discharge capacity (806 mAh g-1) is obtained from the cell with melted sulfur. This results, as well as SEM photos of the electrode morphology Chapter 3: S8 electrode on NwC 102PDF Image | Accumulateur Lithium Soufre
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