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fading, irreversible consumption of LiNO3, higher charge overpotential (red arrow) and more importantly – a “fake” contribution to the discharge capacity in the form of the additional discharge plateau, which, if not extracted from the practical value, may be misinterpreted. Our conclusions are very close to the one of Zhang178. 3.4.4. Towards heavily loaded electrodes We already saw the enhanced electrochemical performances of ‘S-on-NwC’ electrodes with relatively high sulfur loading (~ 4.0 – 4.5 mgSulfur cm-2), where quite stable capacities of 700 – 800 mAh g-1 were obtained at C/10 and C/20†. NwC collector allowed us to increase the sulfur loading even more, and composite electrodes (S/C/PVdF = 80/10/10 wt%) with up to 10 – 12 mgSulfur cm-2 were prepared. Figure 3-12 compares the initial cycle profile of two cells cycled at C/100 with different sulfur loadings: 4.0 mgSulfur cm-2 (cell 2; in red) and 11.3 mgSulfur cm-2 (cell 1; in black). (a) (b) Figure 3-12. Initial cycle voltage profile of ‘S-on-NwC’ electrodes with different sulfur loadings: 4.0 mg cm-2 (cell 2) vs. 11.3 mg cm-2 (cell 1), and cycled at C/100 rate. Discharge capacity in regard to: mAh gsulfur-1 (a) and mAh cm-2 (b). Cell 1 (very highly loaded electrode) gives a discharge capacity of 734 mAh g-1, which is lower as compared to cell 2 – 1120 mAh g-1. The difference may lie in polarization phenomena. Indeed, as the loading increases, the current applied at a constant C-rate increases proportionally. Then, even with same resistance values of the cell, the overpotential automatically increases. The capacity corresponding to the sulfur reduction and formation of high-order polysulfides (at the little dip, a transition point between both plateaus) is relatively similar: 330 and 370 mAh g-1 for cell 1 and cell 2, respectively. More significantly, † to recap: Al-based electrodes for the same loading gave ~ 300 - 400 mAh g-1 85 Chapter 3: S8 electrode on NwCPDF 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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