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shows the CV profile of a cell showing a large initial overpotential. In this case, the 1st oxidation step had to be performed up to 4.0 V. The Li2S oxidation peak is visible at 3.65 V. Another little anodic peak at 3.9 V is observed, which may be related with a slight electrolyte degradation. Further cycles, carried out in the potential window of 1.7 V – 2.8 V, show expected peak positions (as previously demonstrated on Figure 4-8). We can consider that complete activation of Li2S took place during the first cycle, since the charge capacity reached almost complete theoretical value (97 %). Figure 4-17. Cycling voltammetry curve of Li2S/SuperP®/PVdF electrode (with Li2S loading of 1.14 mg cm-2) performed at 0.03 mV s-1 scan rate. An example where ‘highly polarized’ Li2S-based electrode requires higher than usual cut-off voltage potential for complete active material oxidation, i.e. in this case initial charge was performed up to 4.0 V. On the contrary, if the initial oxidation is stopped at a lower potential, (in this example: 3.6 V; Figure 4-18), incomplete activation of Li2S electrode is obtained, and the initial discharge capacity is lower. In the next cycle, residual Li2S material is oxidized (the activation peak is nevertheless shifted to lower potential values), and following discharge capacity is noticeably increased. Chapter 4: Li2S electrode 132PDF Image | Accumulateur Lithium Soufre
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