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mAh g-1). However, when returning to moderate and slow C-rates (C/5, C/10, C/20), the capacity almost comes back to its initial values. When comparing the rate capability tests performed on NwC and on Al-based electrodes, the capacities at low rate are much higher for ‘S-on-NwC’ electrode as previously discussed. However, at 2C, the capacity is practically equal to zero. The limiting process at high C-rate is clearly associated to the mass transport limitation, more important with ‘S-on-NwC’ as the complete cell is thicker. Figure 3-10. ‘Asymmetric’ rate capability tests performed on the electrodes coated on different collectors: NwC and Al foil. Electrodes of different sulfur loadings. 3.4.3. Lower voltage limit and its correlation with different S/C ratios Most of our work was based on ‘reference’ electrode composition (80/10/10 wt% of sulfur/SuperP®/binder). However, when increasing the carbon content in the electrode, an additional plateau started to be visible at ~ 1.5 V, getting longer when increasing fractions of carbon. This additional electrochemical process was attributed to the reduction of LiNO3 additive contained in the electrolyte. Different compositions were prepared, as shown on Table 3-3. The electrodes were galvanostatically cycled in the potential window of 3.0 V – 1.5 V at C/10. It can be seen that, when having carbon content of 45 %, the contribution of this additional reduction tail is as high as ~ 18 % of the total capacity. Chapter 3: S8 electrode on NwC 83PDF 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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