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Chapter 5: In situ and operando XRD (a) (b) (c) Figure 5-18. Evolution of XRD patterns of a pre-cycled cell: 25th charge and 26th discharge at C/20 were observed (a), experimental voltage profile with the moments of solid phases formation/disappearance (b), capacity retention at C/20 over 25 cycles prior to synchrotron measurements (c). Formation of sulfur at the end of charge could not be entirely confirmed. Indeed, Bragg peaks appeared and disappeared at the moments expected for sulfur appearance/disappearance. However, as our statistic were quite low and as the peak profile is ill-defined due to technical problems with the beam, it was difficult to clearly assign these patterns. Therefore, it was hardly possible to conclude on the formation of beta crystalline form of sulfur. 5.6. Influence of the C-rate: C/8 studies In this section, we aimed at investigating the influence of current density (almost three times higher as compared to C/20; i ~ 0.9 mA cm-2 ↔ C/8) on the active material structural changes 185PDF 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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