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This work has open several ways for further investigations. As concerning the development of sulfur positive electrode, further studies on carbon based current collector may be a promising way to follow in order to obtain high sulphur loading with high practical capacity. Optimisation of collector’s parameters, like: thickness, porosity, weight, etc. should be strongly considered for high energy density cathodes. Nevertheless, no matter the current collector used, sulphur loading should be always considered as a very important parameter, and loadings much higher than 2mgsulfur cm-2 should be only taken into consideration, otherwise the Li/S technology will not be a ‘seriously considered’ candidate to beat the today’s Li-ion technology. Following this aspect, also while designing the cell, fabrication process should be relatively easy and possible for future scale up. Therefore, too complicated electrodes architectures which requires too expensive techniques and processes impossible to apply in a large scale, should be simplified, otherwise will never be considered as a potential product for large scale application. Parameters like S/E ratio, sulfur loading and sulfur fracation in the electrode should be carefully controlled and always provided in any scientific report, as these are the parameters that play very important role on the cell cyclability and performances. As regard to the Li2S positive electrode, further optimisation and improvement of fabrication process should be considered, i.e. decrease of the particle size and improving the intimate contact with carbon. Further studies should be also done for deeper understanding of the mechanism occurring in the initial charge. When using Li2S in a complete metallic lithium free cell, like Si/Li2S, the work on balancing of the cell, improvement of the electrolyte could be carry out. Possibly more fundamental studies should be performed on the effect of the polysulfides on the negative electrode used, in that case Si. Techniques like XPS, SEM would be useful. Nevertheless, many scientist still claim that Li/S have the potential to beat Li-ion cells only in a configuration: S8 vs. Li – the most realistic solution according to them. This however, still requires a work on the protection of the Lithium surface, to diminish polysulfides shuttle, parasitic reactions, safety issues etc. The work on the lithium protection has been carried out since few decades and is still not resolved. But it has great potential since other emerging technologies like Li-air are facing the same ‘problems’ coming from metallic lithium utilization. Up to now, there has been an impressive progress done in the field of the understanding of the working mechanism. And this direction is definitely the one to follow, since we are still not sure about the whole reactions occurring in the Li/S cell. Moreover, the working mechanism may be very different, depending from the electrolyte or the sulfur electrode used. Therefore, an interesting and great possibilities lies there. Also, in order to have wider vision of investigated system, application of two or even three characterisation techniques in parallel should be a popular practice, and if possible, applied via in situ methodology to have direct response of a battery upon cycling. 233 Conclusions & PerspectivesPDF Image | Accumulateur Lithium Soufre
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