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Moreover, these results clearly eliminate the possible presence of the parasitic reactions, which might have explained the potential evolution observed. Indeed, the equilibrium potential corresponds, in all charge process, to expected polysulfide oxidation. The GITT measurements also provide qualitative information on the cell kinetics, by evaluating the different relaxation profiles between each current pulse. Selected relaxation profiles obtained for different states of charge are shown in Figure 4-12. (b) (c) (a) Chapter 4: Li2S electrode Figure 4-12. Comparison of selected relaxation curves profiles (trelax = 30 min) obtained with GITT measurement on Li/Li2S cell (b,c). The points at which relaxation potential evolution was selected, correspond to different steps during the charge process, as marked on the voltage curve (a). During ‘step 2’, where the overpotential is very low, the potential evolution with the time during relaxation is coherent with a process limited by diffusion process, i.e. linear potential evolution as a function of time – t1/2 (point B, C and partially point D on Figure 4-12b). In the other parts of the curve (point A, E, F), the relaxation of the potential vs. time (t1/2) is more complex. This complexity could be associated with the fact that several electrochemical 125PDF Image | Accumulateur Lithium Soufre
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