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(2.1 V), since the Si anode has an average charge potential of ~ 0.4 – 0.5 V vs. Li+/Li. The lower discharge plateau also seems to be more sloped, again due to the voltage profile of Si. The second charge displays also a difference in terms of potential, even if slighter, related to the Si anode profile during charge. In general, the Li2S positive electrodes, in both, Si/Li2S or Li/Li2S systems, seem to work very similarly, the difference in voltage value and profile being only related to the behaviors of the two different negative electrodes. It also seems that Li2S/Si cell has even more stable capacity retention (Figure 4-35d). In consequence, the capacities of the two systems are very close after 70 cycles. Furthermore, the Si/Li2S cell does not exhibit the problematic behavior of metallic lithium during charge, i.e. short circuit due to dendrites formation. Similar to Li/Li2S coin cells, the initial charge, and mainly the limiting process of Li2S oxidation, rules the capacity obtained in the further cycles. As an example, Figure 4-36 shows the performances of the cells initially charged to 3.2 V and 3.5 V. Figure 4-36. Galvanostatic performances of Si/Li2S full cells (C/20) depending on the initial charge cut- off potential, i.e. 3.2 V or 3.5 V, while following cycles are in the potential window 1.0 V – 2.6 V. These results allow to propose the following assessments: • The irreversibility of Si in ether-based electrolyte is not detrimental towards capacity values, and may be improved in the future by electrolyte optimization, for example; • The sulfur chemistry is not noticeably disturbed by the use of Si counter electrode; • These preliminary results seem to confirm the interest for Li2S/Si system as a promising alternative to the Li/S conventional system. Chapter 4: Li2S electrode 154PDF Image | Accumulateur Lithium Soufre
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