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Chapter 5: In situ and operando XRD (a) (b) Figure 5-2. In situ XRD patterns of the complete cell (beam in position [2]) with corresponding experimental voltage profiles during initial discharge (a) and charge (b). Bold lines indicate precise moment of solid/soluble phase transitions. Moreover, all along the lower discharge plateau, the four Bragg peaks are nicely centered on the positions expected for Li2S. This indicates that solely Li2S crystalline form was detected, and no evidence of crystalline Li2S2 formation was found. However, quantitative analysis of the results included in further section will give deeper interpretation. It is worth noticing that solid Li2S was experimentally detected right after the little dip in the discharge curve (green arrow on Figure 5-2a). The formation of a solid phase (nucleation step) nicely explains the origin of this potential dip, and is in agreement with the literature statements. However, at the moment we obtained these findings, only the theoretical studies based on mathematical models were correlating the presence of such potential dip with the 162PDF 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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