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in the glovebox for at least 12 h at room temperature before being tested. Since the amount of electrolyte can have a great effect on the performance of the cell [126, 127], its dosing is done extra carefully: Each cell contains 50–60 μl of liquid electrolyte; in order to ensure optimal wetting of all surfaces, the electrolyte is added to the cell in two portions: the first one is applied on top of the cathode before adding the separator, the second one on top of the separator before adding the anode. The separator is larger than both the anode and cathode and the amount of electrolyte is slightly more than is needed to fully soak the separator. Thus, there is a surplus of liquid electrolyte which causes an adhesive force between the separator and the stainless steel casing around the electrodes and also serves as a reservoir – in case some electrolyte is decomposed or otherwise lost during cell operation. Figure 2.6: Components of a CR2032 cell (left to right): Stainless steel bottom cas- ing, positive electrode (Li2S composite on Al foil), separator (Celgard 2400 membrane), negative electrode (Li foil), stainless steel spacer, bell washer, rubber seal, stainless steel top casing. Ruler: inches. Table 2.4: Standard composition of the positive electrode slurry. compound active material carbon black binder toluene amount wt.% of solids 80 10 10 (~900) total amount mg 72 9 9 804 28PDF Image | Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling
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