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Chapter 6: EIS and low temperature studies Figure 6-9. Nyquist plots evolution during initial discharge and charge. Numbers in red indicate the points (at the voltage profile) at which EIS was recorded. Three main regions can easily be distinguished, i.e. high, middle and low frequency domain. It is also clearly visible that Nyquist plot ‘shape’ is strongly related with the state of discharge/charge of the Li/S cell. The spectra obtained with this particular coin cell were fitted (as a representative example) and more detailed discussion concerning each region (HF, MF, LF) is presented in further sections. If correlating the recorded spectra with the experimental discharge voltage profile, following statements, deduced from the global observation, can be concluded: • Zone 1: spectra 1 to 5 (corresponding to the upper discharge plateau and the region between the two plateaus) – no remarkable evolution is observed. A small decrease of the middle frequency semicircle is visible. Appearance of a little LF semicircle at spectra #3, which origin will be discussed further; • Zone 2: spectra 6 to 10 (along the lower discharge plateau: the beginning) – strong decrease of the middle frequency semicircle is observed. A little LF semicircle starts to be visible again, however, barely detectable; • Zone 3: spectra 10 to 16 (along the lower discharge plateau: the end) – significant increase of the low frequency semicircle, reaching the maximum at the end of discharge. In the literature, for the reports dealing with EIS applied upon cycling, rather similar evolutions are visible. Moreover, when it comes to the fitting and proposed equivalent model, they all look quite similar, i.e. each visible semicircle is modeled classically as R//CPE, and CPE or 201PDF Image | Accumulateur Lithium Soufre
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