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After having attributed the origin of the semicircles observed at the initial state of Li/S cell, we then applied EIS technique via in situ methodology, upon galvanostatic cycling. Further section presents the obtained results. 6.5. Li/S battery upon cycling – initial cycle Figure 6-8 shows experimental cycling voltage profile of a Li/S cell cycled at C/20. Pseudo- equilibrium potentials, at every point where the cell was stopped and relaxed for 15 min before EIS was recorded, are also indicated (red dots). (a) (b) Figure 6-8. Experimental cycling curve with indicated points at which EIS spectra were recorded after 15 min of relaxation, i.e. equilibrium potential (red dots): discharge (a) and charge (b) profiles. 6.5.1. Nyquist plot evolution Figure 6-9 shows the evolution of the Nyquist plot, obtained while recording the impedance every 1 hour during initial discharge and charge. For easier visualization, the numbers at the spectra correspond to the numbers reported on the cycling profile. Chapter 6: EIS and low temperature studies 200PDF Image | Accumulateur Lithium Soufre
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