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Chapter 4: Li2S electrode Figure 4-10. Discharge profiles recorded on the cells showing different charge behaviors, presented on Figure 4-9. 4.2.4.b) GITT technique GITT was applied in order to follow the equilibrium potential of the system at different states of charge/discharge. It also brought information on the dynamic of the cell, i.e. evolution of the potential vs. relaxation time. Figure 4-11 presents the GITT curve obtained when cycling the Li/Li2S cell. (a) (b) (c) Figure 4-11. GITT results obtained from Li/Li2S cell, with positive electrode of classical composition 70/20/10 wt% = Li2S/SuperP®/PVdF and active material loading of 1.68 mgLi2S cm-2. GITT test was composed of short (20 min) repeating sequences of galvanostatic cycling at C/20, i.e. at a current of 98 μA cm-2, followed by relaxation time of 30 min: 1st charge (a), 1st discharge (b), 2nd charge (c). At the beginning of the initial charge (marked as ‘step 1’), a rapid increase of the potential is observed, related to a high polarization of more than 1.0 V, which corresponds to the initial activation of Li2S. Regarding the relaxation potential (potential obtained at the equilibrium; in red), a decrease between ~ 2.5 V and ~ 2.4 V is observed. Once the activation step has proceeded, the sharp decrease of the potential ‘under current’ to about 2.5 V is observed. The 123PDF Image | Accumulateur Lithium Soufre
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