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4.3.1. Ether-based electrolyte with VC addition In the first step, we investigated the effect of VC addition regarding the cycling performances of sulfur electrode. For this purpose, ‘reference’ sulfur electrodes were used, casted on aluminum foil (composition of 80/10/10 wt%; average sulfur loading of ~ 2.0 mgSulfur cm-2). VC was added to the reference electrolyte in two different amounts: 2 wt% and 0.24 wt%. Figure 4-32a presents the capacity retention of sulfur electrodes (vs. Li) cycled with three ether- based electrolytes: 0, 0.24 and 2 wt% of VC added to the ‘reference’ electrolyte (containing already LiNO3 additive). Chapter 4: Li2S electrode (a) (b) (c) (d) Figure 4-32. Capacity retention (a) over 45 cycles of three cells with classical sulfur electrode (S/SuperP®/PVdF = 80/10/10 wt%) cycled vs. Li at C/10. The cells contain ‘reference’ ether-based electrolyte (1M LiTFSI + 0.1M LiNO3 in TEGDME/DIOX = 1/1 vol) with different amounts of VC additive: 0 % (in blue), 0.24 wt% (in green) and 2 wt% (in red). Voltage profile of 1st (b), 5th (c) and 40th (d) cycles. 149PDF Image | Accumulateur Lithium Soufre
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