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Accumulateur Lithium Soufre

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Accumulateur Lithium Soufre ( accumulateur-lithium-soufre )

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(c) Figure 1-15. Comparison of electrochemical properties of simply mixed commercial Li2S and C powders (a), with C-Li2S nano-composite prepared through dissolution procedure in anhydrous EtOH with PVP binder (b). Capacity retention of improved Li2S electrodes, as compared with other existing literature reports (c).142 It is also interesting to see how the literature refers to a simple Li2S/carbon mixing in comparison with the “optimized composite electrodes”. Yang et al.154 claim that simple mixing of commercial as-received powder with carbon black results in almost no capacity (25 mAh g- 1), while nano-Li2S@CMK-3 confined structure (with relatively complicated fabrication procedure) displays initial discharge capacity of 580 mAh g-1, as presented on Figure 1-16. Chapter 1: Literature review (a) (b) (c) (a) (b) (c) Figure 1-16. Initial cycle voltage profile of nano-Li2S@CMK-3 confined structure (a) as compared with simply mixed commercial Li2S and C powders (b), and corresponding capacity retention of both electrodes (c) 154. Since Li2S first charge significantly differs from the following cycles, Yang et al.141 proposed a mechanism for this initial oxidation (Figure 1-17). As Li2S is relatively difficult to oxidize, 33

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