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Chapter 6: EIS and low temperature studies (a) (c) (b) (d) Figure 6-29. Nyquist plot recorded at the end of discharge (a,b) and charge (c,d) for all temperatures: 25 °C, 0 °C, -20 °C and -30 °C. At the end of charge (Figure 6-29c,d) basically the same trend is observed in terms of Li/electrolyte interphase (MF semicircle), i.e. resistance increases with the temperature decrease. However, the semicircle at the LF (RPS//CPEPS) is now more related with the soluble species (not the same response as at the end of discharge, where formation of solid form takes place), and thus with the decrease of the temperature, the resistance is increasing drastically. It is related with the fact that the electrochemical oxidation of soluble polysulfides is slowed down at lower temperatures. The activation energy of the process could be then determine (Figure 6-30), and the value of Ea = 0.67 eV is found. Such high activation energy could be related to an electrochemical process coupled with chemical process involving sulfur crystallization. 226PDF Image | Accumulateur Lithium Soufre
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