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For both electrodes, CMC and PVdF-based ones, similar trend is observed, i.e. the maximum point is shifted to higher sulfur loading (~ 6 mgsulfur cm-2) when the C-rate is slower (C/20). Globally CMC-based electrodes give better capacity as compared with PVdF-based one. Figure 2-10. Initial discharge capacity as a function of sulfur loading (mgsulfur cm-2), for both electrodes: CMC (in black) and PVdF-based (in red) compositions. Two current rates were applied: C/20 and C/5. To summarize, no significant difference was found when using different binders. Quite similar overall capacity retention (with slightly better performances of CMC composition) was obtained for both types of electrodes. More significant differences in terms of capacity retention were found for different electrodes’ loadings. In the next section, we see how the electronic properties differ, depending on different parameters, among which the nature of the binder is studied. 2.3.3. EIS investigation In order to study the electric properties of the electrodes, EIS technique was used. The concept of using symmetric cell impedance has already been applied to study the insertion electrodes for Li-ion batteries224-226. However, to our best knowledge, it was never applied to the sulfur positive electrodes. All the impedance studies of Li/S system are usually conducted in a classical two-electrode coin cell configuration111,128,129,132,209,227. Such conventional EIS measurements are not the most suitable for expressing the accurate response of the positive electrode only, because of the counter electrode’s presence – a metallic lithium – which is commonly known from its large contribution to the impedance of a complete cell224. Thus, aiming at observing solely the contribution of sulfur positive electrode, it was necessary to Chapter 2: S8 electrode on Aluminum 58PDF 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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