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(a) (b) Chapter 5: In situ and operando XRD Figure 5-7. Zoomed view on α-S8 peaks disappearance during initial discharge (a). Integrated surface area of selected reflections as a function of discharge capacity (b). As previously explained, monoclinic β-sulfur is formed at the end of charge. Since it has a different crystalline structure as compared to the initial orthorhombic α-S8, the peaks appear at different positions, thus a comparison of their intensity before cycling and at the end of charge gives no pertinent data. However, surface area integration of β-sulfur most intense reflections (four peaks were selected: (130), (-113), (131) and (113) may give insights into the crystals growth. (a) (b) Figure 5-8. Zoomed view on β-sulfur peaks formation at the end of the initial charge (a). Integrated surface area of selected reflections as a function of charge capacity (b). It can be seen that the behavior of the four selected peaks is the same, i.e. a rapid increase of their surface area, and then much slower evolution indicating a nonlinear formation of beta-S8 vs. charge capacity. This evolution may be related to the formation of soluble sulfur which does not precipitate/crystallize, or to some part of the capacity not associated with the formation of sulfur (oxidation of S62- to S82- or shuttle mechanism). Concerning the particle size, the 170PDF 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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