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Chapter 5: In situ and operando XRD (a) (b) Figure 5-15. In situ XRD patterns evolution and corresponding electrochemical curve recorded during 2nd cycle at C/20: discharge (a) and charge (b). Peaks related with packaging are marked by *. Loss of the beam resulted in some of the XRD patterns missing. The cell had to be stopped twice during discharge, which explains the voltage peak visible upon discharge. Solid crystalline sulfur disappears completely with the end of higher plateau (at 126 mAh g-1) and reappeared at the end of charge (at 848 mAh g-1). In both cases, only β-sulfur was detected. The general trend is very similar to the one observed at the initial cycle. Sulfur disappearance is rather linear (Figure 5-16), with no specific orientation during sulfur consumption, while sulfur recrystallizes with preferential orientations upon 2nd charge, since the intensities of the peaks evolve randomly, once higher once lower, as compared with the intensity observed at the end of previous charge. This prohibits any estimation of the amount of crystalline sulfur created at every further charge. 182PDF 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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