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6.4. Li/S cells upon storage – evidence of self-discharge Li/S coin cell was stored for 250 h at a stable temperature of 25 °C and OCV potential was monitored. EIS spectra were recorded every 30 min. Figure 6-5 shows the evolution of OCV and selected EIS spectra. It can be seen that the vertical line in the low frequency region is slowly losing its blocking character. This capacitive behavior disappearance occurs quite quickly, already during initial 10 h, where the potential decreases drastically (Figure 6-5b). (a) Figure 6-5. Li/S cell left for 250 h storage time, during which EIS was recorded every 30 min. OCV potential evolution (a), Nyquist plot evolution observed during initial few hours (marked in red) (b), and the spectra obtained during further hours of storage (marked in blue) (c). The reason for that may lie in the relatively easy partial sulfur dissolution in the electrolyte. Literature data247 as well as our previous experiment (section 3.4.10: the proof-of-concept of insulated sulfur electrode being able to work) proved that dissolution of solid sulfur in ether- Chapter 6: EIS and low temperature studies (b) (c) 197PDF Image | Accumulateur Lithium Soufre
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Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
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