Accumulateur Lithium Soufre

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Accumulateur Lithium Soufre ( accumulateur-lithium-soufre )

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Chapter 6: EIS and low temperature studies Figure 6-22. Nyquist plot evolutions during 1st – 2nd – 3rd discharge. If now having a deeper look on the electrolyte resistance variations for corresponding 2nd and 3rd cycles presented, it can be noticed that very similar evolution as in the 1st cycle is found. The results are shown onFigure 6-23. (a) (b) Figure 6-23. Electrolyte resistance evolution during 2nd and 3rd discharge (a) – charge (b) cycles, as a function of state of discharge/charge. During discharge, a maximum of Rel always corresponds to the beginning of lower discharge plateau. During following charges, electrolyte resistance is evolving in the same manner as in the initial cycle, with significant hysteresis between charge and discharge maximum resistance values (R’max ≠ R”max). Such evolution was observed until the 7th cycle measured upon cycling with in situ EIS. When plotting the resistance value recorded at the maximum of each discharge (R’max) with the capacity retention, a very coherent tendency can be noticed: i.e. decrease of electrolyte resistance along with capacity fading, except for the initial cycle (Figure 6-24). 219

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