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Materials. Concerning the choice of materials, a few possible improvements come to mind: First, the separator is not specifically optimized for Li/S cells. Both func- tionalized polypropylene and carbon nano-/microfiber separators are available which could probably improve the wetting along with other benefits [92, 169–172]. Second, concerning the electrolyte, Pyr14TFSI could be exchanged for Pyr14FSI which is not only less corrosive, but also considerably cheaper. Furthermore, mixtures of these and other anions are known to improve conductivity as well as low temperature perfor- mance [173–175]. The same is true for the cations, where Pyr13, Pyr14, and Pyr15 could be mixed as well as pyrrolidinium derivatives, like Pyr12O1, cf. Fig. 3.28. Third, more electrolyte additives could be tested, e.g. those mentioned in Refs. [82, 83, 160, 176]. ⊕⊕⊕ NNN O O⊖O O⊖O F3C S N S CF3 F S N S F OO OO Figure 3.28: Possible improved composition of the ionic liquid portion of the elec- trolyte as suggested by Ref. [177]. Details see text. While the experimental results reported above constitute a noteworthy piece of work in their own right, they also serve as input to the modeling study presented in the following chapters. 67PDF Image | Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling
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