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Figure 2-21. Post mortem photos of three sulfur electrodes (loading of about ~ 4.5 mgSulfur cm-2) with different binders, i.e. PVdFmanual, PVdFdispermat and CMCdispermat, recuperated after 100 cycles at C/5. Other tests were done with symmetric coin cells prepared with the electrodes recuperated after 10th charge. For the purpose of this experiment, four CMC-based electrodes (similar in thickness and mass) were selected. Two of them were used for making a symmetric coin cell, on which EIS was measured at the initial stage. The two others were used for fabrication of two identical Li/S complete cells, which were then galvanostatically cycled at C/20 for 10 cycles and stopped at the end of charge. Such pre-cycled electrodes were recuperated from the Li/S coin cells, gently washed with DIOX, symmetric coin cell was built and EIS was measured. Similar steps were carried out with four PVdFmanual electrodes. EIS results of the coin cells built with fresh and pre-cycled electrodes are shown on Figure 2-22. (a) (b) Figure 2-22. Nyquist plots of symmetric coin cells built with fresh and cycled electrodes (recuperated at the end of 10th charge), using different binders: CMC (a) and PVdFmanual (b). Already when recuperating the electrodes after 10 cycles, it was noticed that PVdFmanual-based electrodes were slightly unstuck from Al collector, while CMC ones were fully adhering. EIS results show that the resistance of CMC-based electrode stays almost unchanged after cycling. A significant increase of the resistance of PVdF-based electrodes can be noticed. Moreover, the characteristic frequency is shifted to lower domain (from 6 kHz to 1 kHz). This may be Chapter 2: S8 electrode on Aluminum 69PDF 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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