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VGCF® fibers surprisingly provide the lowest capacity at faster rates, which may be related to the lack of carbon nano-particles to allow for good conductive network. (a) (b) (c) Figure 2-7. Rate capability tests of three sulfur electrodes prepared with different carbons: SuperP® (in black), VGCF® (in blue), SuperP®+VGCF® (in red), and with similar sulfur loadings of ~2.5 mg cm-2. Capacity retention at different C-rates overs 55 cycles (a), corresponding voltage profiles obtained during 1st cycle at C/20 (b) and 15th cycle at C/5 (b). The efficiency of the binder adsorption on the two different types of carbon materials (especially with different shapes: nano-spheres vs. fibers) may also have a large impact, and it can influence the accessible specific surface of carbon and the cohesion of the electrode. That may probably explain the differences observed in terms of polarization, where “VGCF®” electrode displays slightly higher overpotential during initial sulfur reduction, as compared to other electrodes, and all along charge process (Figure 2-7b), and more noticeably at faster rates (Figure 2-7c). The initial polarization may be probably related with not completely connected sulfur particles with VGCF®, as can be seen from the SEM photos (Figure 2-6d-f). Chapter 2: S8 electrode on Aluminum 53PDF 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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