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Chapter 4: Li2S electrode Figure 4-1. Schematic illustration of the Li2S-based electrode preparation procedure. All the preparation steps were carried out inside the glove box. In the previous chapter (section 2.2.4), we discussed the nature of errors in relation to sulfur electrode, which may influence calculated capacity values. In case of Li2S electrodes, similar errors related to inhomogeneity of manually prepared electrodes should also be considered. Moreover, because of the lower scale precision (∆M(electrode) = 0.1 mg), average ∆Capacity for Li2S electrodes is slightly higher as compared to the typical ‘S-on-Al’ electrode, and is in the range of 3.8 %, according to the equation (8). ∆Capacity = ∆M(electrode) + ∆M(Al) + ∆%S (8) Capacity M(electrode) − M(Al) %S where: Capacity: 2.94 mAh; M(electrode): 12.0 mg; M(Al): 8.4 mg; ∆M(Al): 0.01 mg; ∆%S: 0.5 %; %S: 70 %. 4.2.1.b) Characterization techniques Galvanostatic cycling (GCPL; performed on Arbin® battery cycler) and cycling voltammetry (CV; recorded on VMP3 Bio-Logic®) have been applied as standard electrochemical methods for cycling performances evaluation, at room temperature (RT). Typical Li2S electrode cycling was performed at medium C-rates (C/20 or C/10). Other C-rates (C/100 or even 1C) were also applied, depending on the aim of the measurements. Current density values were calculated with respect to the theoretical capacity of active material (1166 mAh g-1) and its loading. CV measurements were conducted at a scanning rate of 0.03 mV s-1. Selection of potential window is extensively discussed in paragraph 4.2.5, and is provided for each electrochemical test separately. 112PDF Image | Accumulateur Lithium Soufre
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