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a total thickness of ~ 275 μm) may be detrimental for the mass transport and provides a long pathway for the active species diffusion. Figure 2-20. Average discharge capacity as a function of applied C-rate, for three sulfur electrodes, with different binders, i.e. PVdFmanual, PVdFdispermat and CMCdispermat, cycled vs. Li. Electrodes of high sulfur loadings of 5.6 – 7.5 mgSulfur cm-2. The galvanostatic cycling behavior of the PVdFmanual and PVdFdispermat electrodes are very close, with a capacity close to zero at 2C. However, their EIS response measured in symmetric coin cells is very different (Figure 2-17), which clearly shows that the morphology of the electrode (conductive pathways) may not be a single limiting parameter in the Li/S system, and that an improved EIS response (i.e. lower resistance values for the CMC or PVdFdispermat electrodes) does not necessarily lead to better capacity retention upon cycling and high performances at high rate, contrarily to what is commonly said in the literature111. 2.3.4.b) Post-mortem studies Post mortem analyses were done on sulfur electrodes after prolonged cycling (electrodes recuperated from the cells cycled at C/5 during ~ 100 cycles, shown on Figure 2-19), and the photos are presented on Figure 2-21. CMC-based electrode presents the best state, i.e. the carbon/binder matrix is still completely stuck to the aluminum current collector, even after scratching the electrode. PVdFdispermat electrode looks similar, however, the carbon/binder pieces went out very easily when slightly scratching the electrode surface. The worst case was found for PVdFmanual electrode, where carbon/binder mixture was completely peeled away from the collector. These observations would lead to the conclusions concerning the adhesion properties of the electrodes: CMC >> PVdFdispermat > PVdFmanual. Chapter 2: S8 electrode on Aluminum 68PDF 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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