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capacity at around 430 mAh g-1 after 80 cycles (or 620 mAhsulfur g-1, when related to sulfur mass), and at moderate rates (C/20, C/10 and C/5). We can also see that, at 1C, the capacity is fading drastically, showing that such NwC-based electrodes are not optimal solutions for high power cycling i.e. long diffusion pathway, as it was already shown for ‘S-on-NwC’ composite electrodes in the previous chapter. However, once the current comes back to slower rates (C/10 and C/20), the capacity value rises up to 430 mAh g-1. (a) (b) Figure 4-27. Rate capability tests performed on Li2S electrodes coated on two different collectors: Al foil and NwC collector. Electrodes are of different active material loadings, i.e. 1.14 and 3.59 mgLi2S cm-2 for Al- and NwC-based, respectively. The cycling procedure was applied via ‘symmetric’ methodology, i.e. equal C-rate during discharge and charge of the same cycle. Capacity retention (a) and average discharge capacity as a function of C-rate (b). Li2S systems present the same behavior vs. C-rate (Figure 4-27b) as it was previously demonstrated for sulfur-based one, i.e. a slow capacity decrease up to C/5, while dramatically going down for higher C-rates. If we compare the results obtained for the two systems, on both, NwC and Al foil, in any cases the capacities at low rate are much higher for NwC based electrodes, although the capacity at higher C-rates are almost the same. It has been demonstrated that application of carbon based current collector to the electrode structure may significantly increase the electrode loading, while still offering much better electrochemical performances as compare to the Al counterpart electrodes. Obtained capacity values if presented in respect to sulfur weight, are very promising (an example from Figure 4-27a: 80th cycle displays the capacity of 430 mAh gLi2S-1, which is an equivalent of 620 mAh gSulfur-1). Chapter 4: Li2S electrode 143PDF Image | Accumulateur Lithium Soufre
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