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Chapter 3: S8 electrode on NwC (a) (b) (c) Figure 3-24. Galvanostatic cycling results of the ‘catholyte’ cells with T10-NwC collector pressed with different weight: 0, 1, 1.5, 2 and 5 tons. The electrolyte solution was containing 75 μL of 0.25M Li2S6 + 1M LiTFSI + 0.1M LiNO3 in TEGDME/DIOX = 1/1 vol, resulting in the theoretical capacity of 6.0 mAh. Initial voltage profiles (a), discharge capacity as a function of the current collector thickness after pressing (b) and capacity retention during several cycles (c). It can be seen that the discharge capacity is lower for more pressed electrodes (268 mAh gSulfur-1 for the cell pressed with 5 tons). Slight pressure (pressing with 1 ton) does not affect the electrochemical performances, and the capacity is practically identical as the ‘non-pressed’ sample (390 mAh gSulfur-1)§§. This results somehow confirm that a strong relation exists between obtained capacity and available porosity. For highly pressed electrodes (2 tons or more), a ‘broken fiber’ structure is observed, which may affect the percolation network, thus the conductive available area. Nevertheless, even if fibers were broken, we believe that the electronic contact between the fibers in the cell was preserved thanks to applied pressure. §§ This value is different from 538 mAh g-1 presented on Figure 3-21, because both experiments were performed in large time interval/space, therefore not exactly the same ‘catholyte’ solutions were used. Also different cycling rates were applied (C/20 and C/10). 100PDF Image | Accumulateur Lithium Soufre
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