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Warburg impedance is used for modeling the diffusion part. However, the main difference lies in the interpretation of the visible semicircles’ origin, and thus of the phenomena correlated with them. Table 6-1 summarizes some of the proposed interpretation given in few reports, where a priori the same observations were detected. On purpose, original writing is preserved, taken directly from the articles. Table 6-1. Summary of five articles dealing with in situ EIS and their proposed explanations of different Nyquist plot parts132,207,209,212,213. It can be seen that, apart from ideal match when it comes to the high frequency region and its assignment to the resistance of the electrolyte, further comparison cannot be done between five selected examples. A variety of different propositions are given, and discussion about their correctness is not the scope of this manuscript. Nevertheless, such significant differences between the interpretations can be simply confusing, without mentioning that a crucial information like characteristic frequency values, are not included in 80 % of the reports, thus making it difficult for a reader to conclude on its own interpretation. In order to define the most relevant equivalent model for our in situ EIS results, we went a step further and a symmetric coin cell approach was applied at different states of discharge. The results are described in the following section. Chapter 6: EIS and low temperature studies 202PDF Image | Accumulateur Lithium Soufre
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