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Figure 1-4. Position of Li/S batteries among the other rechargeable battery technologies, in terms of volumetric and gravimetric energy density. There is absolutely no doubt that Li/S batteries are considered as a very realistic candidate for the next-generation energy storage systems. Significant progresses were made during past few years, which are shortly presented in further section. However, there is still a long way to go and many challenges to overcome, since the system suffers from several unresolved drawbacks, which simply induce a large gap between reality and expectations. In later part of the discussion, we also point out the main disadvantages and limitations of the Li/S technology. But before that, it is necessary to describe the way the Li/S batteries operates, as its complex working mechanism is very different from the classical Li-ion cells. 1.2.1. Principles and working mechanism A typical Li/S cell is composed of a sulfur-based positive electrode, a metallic lithium negative electrode, both separated with a porous polymeric separator(s) soaked with an organic electrolyte (often based on ether solvents), as illustrated on Figure 1-5. 16 Chapter 1: Literature reviewPDF Image | Accumulateur Lithium Soufre
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