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exhibits a high tortuosity, as seen on the scanning electron microscopy (SEM) photos (Figure 3-1). Visually, it is a very flexible sheet, ~ 210 μm thick216 with average through plane porosity of 80%231 and area weight of ~ 9.5 mg cm-2 216. This particular NwC is heavier and thicker as compared to a classical Al foil (20 μm; 5.5 mg cm-2), which is not the ideal choice from the gravimetric and volumetric energy density point of view. Nevertheless, its application in sulfur electrodes as a current collector was rather a proof-of-concept. In further discussion, we show that, despite of its high mass and thickness, it already brings improvement to the sulfur electrode behavior. Figure 3-1. SEM photos of GDL felt (non-woven carbon tissue, NwC), a commercial product of Freudenberg (H2315). Its surface area was found to be about 0.05 m2 g-1, value which is really close to the detection limit by BET technique. All the physical parameters of the NwC felt are summarized in Table 3-1. Chapter 3: S8 electrode on NwC GDL commercial name H 2315 (standard) Thickness (μm) 210 Area weight (mg cm-2) 9.5 BET surface area § Through plane (m2 g-1) porosity (%) 0.05 80 § BET measured with TRISTAR II 3020 equipment; degasing was done at 180°C during 6h, while BET measurement was performed under nitrogen N2. Table 3-1. Physical parameters of non-woven carbon (NwC) tissue. 72PDF Image | Accumulateur Lithium Soufre
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