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Sulfur fraction may also be represented as a sulfur to carbon (S/C) ratio. Figure 1-10 demonstrates the voltage profile behavior together with the capacity retention when different S/C ratios are studied. (a) (b) Figure 1-10. Examples of voltage profiles (a) and capacity retention (b) of the electrodes with different wt% of sulfur (thus varying S/C ratios), cycled at a current density of 100 mA g-1.122 It is relatively obvious that lower S/C ratio (lower wt% of sulfur in the electrode) results in better performances, since more carbon is available for less amount of sulfur. However, as suggested by Barchasz et al.35,45, the relation is not fully linear, since other system limitations interfere and prevent reaching the full capacity (at least in simply prepared electrodes). Another parameter that is of very high importance is the sulfur loading (mgSulfur cm-2). Figure 1-11 illustrates that there is a maximum limit in the sulfur loading until which the benefits are visible, i.e. increased areal capacity is obtained. The initial voltage profile for each electrode loading is also shown for illustration. (a) (b) Chapter 1: Literature review Figure 1-11. Examples of the influence of the sulfur loading on the obtained discharge capacity (a) and corresponding voltage profiles (b)125. 28PDF Image | Accumulateur Lithium Soufre
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