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Al2O3/SuperP®/PVdF and varying thicknesses (42 – 64 – 81 μm) were prepared. Figure 2-13 shows SEM photos of the electrode morphology. It can be seen that Al2O3 particles are not completely enrobed by SuperP® particles, as it is in the case of sulfur material, probably because of different hardness of both materials. Sulfur is very soft, which permits to obtain good S/SuperP® contact, while it is more difficult in the case of harder crystalline particles of Al2O3. Figure 2-13. SEM photos of Al2O3/SuperP®/PVdF (80/10/10 wt%) electrodes. Symmetric coin cells were built with three electrode thicknesses, and the obtained results were found very similar to the ones of sulfur-based electrodes, previously presented. Figure 2-14 shows the Nyquist plot evolution together with the fitting parameters of the MF semicircle. (a) (b) Figure 2-14. Nyquist plot evolution of three symmetric coin cells built with Al2O3/SuperP®/PVdF electrodes having linearly increasing thicknesses (a). Summary of the fitting parameters of the MF semicircle as well as the resistance value plotted as a function of the electrode thickness (in red); in comparison with S8-based electrode (in black) (b). Chapter 2: S8 electrode on Aluminum 61PDF Image | Accumulateur Lithium Soufre
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