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of following sulfur fractions: 80 wt% – if referring to the ink composition only, and 30 wt% – when taking also into account the NwC collector. If we then take as an example an electrode with 60 wt% of sulfur in the final ink composition (as this fraction is often considered in the literature), loaded with 1 mg cm-2 of active material, and coated on Al foil, the final sulfur amount would be less than 15 %, taking into account the weight of the complete electrode (including collector)232. Figure 3-13 illustrates the capacity retention of a ‘S-on-NwC’ electrode (with sulfur loading of 4.44 mgSulfur cm-2; cycled at C/20), calculated with respect to: sulfur, complete electrode ink (with carbon and binder additives) and electrode with current collector included. We can see that due to the high weight of NwC collector, the capacity in respect to the total electrode mass decreases to ~ 200 mAh g-1 only. In the following section, we compare these values with the same composite electrode casted on Al foil and similar sulfur loading. Figure 3-13. Capacity retention over 25 cycles obtained with ‘S-on-NwC’ electrode (loading of ~ 4.4 mgsulfur cm-2), cycled at C/20. Discharge capacity values presented in respect to only sulfur mass (in black), composite electrode mass (in blue) and total electrode weight, including NwC (in red). 3.4.6. Aluminum vs. NwC-based electrodes: comparative studies We have previously seen that NwC-based electrodes give much higher discharge capacity values, which is strongly related with the fact of having such porous 3D conductive current collector. Apart from offering a 3D highly conductive network, it provides available surface for Li2S deposition. However, its high weight may be a serious obstacle when comparing with almost twice lighter Al foil. In this paragraph, we compare performances of both Al and NwC- based electrodes, of identical sulfur loadings. Chapter 3: S8 electrode on NwC 87PDF 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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