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Figure 6-24. Discharge capacity retention during seven cycles (in black) together with the maximum value of the electrolyte resistance (R’max) evolution, recorded at each discharge. Indeed, in a typical Li/S cell behavior, a drastic capacity fade after the initial cycle is usually observed and is related with several reasons, like active material loss in the electrolyte, electrode pulverization, etc. Starting from the 2nd cycle, both curves are almost superimposed, the capacity and the resistance are progressively decreasing. Such continuous electrolyte resistance decrease could be related with the fact that lower amount of polysulfides is present in the electrolyte upon following cycles. This loss of active material along cycling could be due to: (1) trapping of the polysulfides on the passivation layer(s) on Li, notably in the first cycle (large evolution of the lithium passivating layer properties), and (2) to the precipitation of Li2S or Li2S2 that cannot be re-oxidized during the next cycles due to bad connection to the electronic network, or precipitations in the separator, for example. Fitting of MF and LF semicircles was also conducted and the results are shown below. Figure 6-25 shows the resistance and the capacitance values of bulk electrode response (RNwC//CPENwC), Li/electrolyte interphase (RLi//CPELi) and polysulfides/carbon interface (RPS//CPEPS), together with voltage profile. 220 Chapter 6: EIS and low temperature studiesPDF Image | Accumulateur Lithium Soufre
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