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Chapter 3: S8 electrode on NwC Figure 3-30. Capacity retention of a ‘S-on-NwC’ cell (sulfur loading of ~ 5.0 mgSulfur cm-2; C/10 rate) where severe short circuiting occurred starting from ~ 30th cycle, leading to a complete death of the cell. After replacing the Li, separators and electrolyte by the fresh ones, the cell was cycled again (at C/20). Figure 3-31 shows the photos of lithium electrode recuperated from a coin cell encountering overcharge problems, together with SEM photos. Figure 3-31. Picture (a) and SEM images (b,c) of metallic lithium electrode recuperated from a Li/S coin cell. SEM samples were air-protected during transportation in a special airtight transfer box. It can be clearly seen (already based on a visual observations) that lithium electrodes present a rough surface, and it is really likely that dendrites were formed. This experiment confirms that the problems of noisy charge are related with lithium. However, it does not exclude separator or positive electrode failures. Deeper studies in this direction should be applied, like for example studies of negative electrode/positive electrode/separator morphology after ‘problematic’ charge (SEM, EDX). One should note, however, that in our experiments, this phenomenon was observed relatively randomly, starting at different cycles: sometimes very early – even at 15th cycle, or much after – such as after 50th cycles for example. We did not find any dependence from applied current neither. No matter the C-rate (C/100, C/20, C/10, C/5, 2C...) and the corresponding applied current densities, this phenomenon was sooner or later observed, even if slightly more pronounced at faster rates and higher loadings. More studies 107PDF 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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