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Chapter 1: Literature review (a) (b) (c) Figure 1-19. Examples of a complete metallic Li-free cells, involving Li2S positive electrode, cycled vs. Sn (a)151 and vs. Si (b,c)154. 1.4. Advanced characterization methods applied to Li/S system Understanding of the working mechanism is an extremely important aspect, because any improvement could not be done without prior broader insight into the limiting parameters and involved reactions. In order to better utilize the complete potential of the Li/S cells (and its high energy density), a comprehensive understanding of the redox reactions is necessary. Thus it is highly desired to provide deeper fundamental understanding of the Li/S system, which is very complex. In the first section (1.2.1), a simplified and very general description of working mechanism was given. However, it is important to note that in reality, different redox reactions together with chemical disproportionation and dissociation reactions occur. Barchasz et al.194 proposed a complete description of the reactions occurring during discharge, by coupling three techniques: UV-Vis spectroscopy, HPLC (High Performance Liquid Chromatography) and ESR (Electron Spin Resonance). A mechanism of sulfur reduction in TEGDME-based electrolyte was proposed, as shown on the illustrative graph (Figure 1-20). It is also important to underline that a “reference” model of a working mechanism, which could be applicable to all Li/S systems, does not exist. The reason for that lies in the fact that so many parameters (cycling conditions, electrolyte nature, sulfur/carbon composite, S/E ratio, active 38PDF Image | Accumulateur Lithium Soufre
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