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4.2.4. The importance of the initial charge 4.2.4.a) Disparities in the charge profiles After preparing several batches of electrodes, even if aiming at reproducibility (i.e. keeping the same composition and preparation method), we quickly realized that the voltage profile of the initial charge significantly varied one from the other, being sometimes very far from the ‘typical’ shape, as shown on Figure 4-4a. This ‘typical’ profile (or very close one) is the one mostly presented in the literature141,147,154,143,239. While working with Li2S electrodes, many other shapes with strong overpotential or different durations/lengths of the plateau were recorded, and selected examples are shown on Figure 4-9. The required cut-off voltage was rather high for these cells (3.8 V or even 4.0 V), and the choice of such high values is discussed later. The obtained charge capacities are very close, and varied between 970 to 1100 mAh g-1. In the literature, only few reports present such different profiles142,153, while some do not provide any initial charge curve at all240. Figure 4-9. Examples of variety of the charge profiles obtained experimentally from the Li2S/SuperP®/PVdF = 70/20/10 wt% electrodes, punched from several batches of the electrode sheet. GCPL performed at C/20. The electrode loadings vary between 1.23 and 2.30 mgLi2S cm-2. The examples presented above come from various batches of electrodes. However, we also noticed that even Ø 14 mm electrode disks punched out from the same electrode sheet, gave sometimes quite different results. This clearly point out a significant lack of reproducibility of the results. Chapter 4: Li2S electrode 121PDF Image | Accumulateur Lithium Soufre
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