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Chapter 4: Li2S electrode Figure 4-33. Capacity retention of graphite electrode cycled vs. Li with three different electrolytes: carbonate-based 1M LiPF6 in PC/EC/DMC (1/1/3 in vol) + 2 wt% of VC (in black), ‘reference’ ether- based electrolyte (in blue), ‘reference’ ether-based electrolyte enriched with 2 wt% of VC (in red). Cycling was performed at C/10 rate in a potential window of 0.01 V – 1.0 V, with the ‘floating’ step at C/100 at the end of each discharge. It can be seen that addition of VC to the ‘reference’ ether-based electrolyte is sufficient to permit the graphite electrode cycling during few initial cycles. However, after some time, drastic capacity fading is observed anyway, like it is seen (but earlier) when using only ‘reference’ electrolyte. This results proves that addition of VC to ‘reference’ ether-based electrolyte would not be a solution to apply. Anyway, these studies were only a preliminary tests, and further tests should be conducted in order to investigate new solvents, compatible with both sulfur-based and graphite electrodes. In the next part dedicated to Si electrode utilization, no change of electrolyte solvents was required. 4.3.2. Si/Li2S cell: proof-of-concept For this purpose, Si electrodes were kindly provided by the SRGE laboratory (CEA-Grenoble), where they were developed through water-based formulations. Electrode slurry made of an aqueous mixture of nano-silicon (65 wt%), carbon fibers (25 wt%), and carboxymethyl cellulose (CMC/NBR) (10 wt%, Mw = 250 kg mol-1, D.S. = 0.7) was coated on a 10 μm copper foil current collector. Ø 14 mm electrode disks were punched out, weighed and dried under vacuum (BUCHI®) at 80°C during 48h before entering into the glove box for coin cell preparation. Resulting active material loadings were ranging between 1.3 – 1.5 mgSi cm-2 (↔ 4.67 – 5.40 mAh cm-2). 151PDF Image | Accumulateur Lithium Soufre
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