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to 2.5 V. This allows to point out that the electrochemical reaction fixing the potential during initial charge is all the time the same, even at very low C-rate. (a) (b) (c) (d) Figure 4-21. Cycling performances of Li2S electrodes of similar loading (~ 1.14 – 1.27 mgLi2S cm-2), cycled at different C-rates: 1C, C/5, C/10, C/20, C/100, C/200 and C/1000. Initial charge voltage (a) and corresponding discharge profiles (b). A zoomed image on activation potential barrier (c) and capacity retention during 100 cycles, except for lower C-rates (d). Indeed, the potential is too high to be fixed by Li2S/Li2S2/Li2S4 redox reactions, as typically observed for Li/S cell and further cycles of Li/Li2S cell. The initial charge capacity values are proportional to the current applied, and are: 1097, 991, 941, 840 and 392 mAh g-1 for C/100, C/20, C/10, C/5 and 1C, respectively, except for C/1000, where strong shuttle mechanism is visible from the beginning. The full capacity (1166 mAh g-1) is obtained for the C/200 rate. On the other hand, lower is the C-rate, more pronounced would be the shuttle phenomenon, which in turn influences the irreversible capacity (Capacitycharge – Capacitydischarge). Corresponding capacity retention of the cells cycled at different C-rates (C/100, C/20, C/10 and C/5) is shown on Figure 4-21d. For all four cells, typical trend of Li/S battery retention can Chapter 4: Li2S electrode 136PDF Image | Accumulateur Lithium Soufre
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