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Chapter 3: S8 electrode on NwC Figure 3-27. Schematic illustration of the ‘insulated sulfur electrode’ proof-of-concept, where sulfur electrode is insulated from the current collector (electron source) by placing a separator layer on the bottom of the coin cell, and additional NwC disk to accept the electrons from the external circuit. The idea of ‘insulated sulfur electrode’ cell was, as indicated by name, to completely insulate the ‘S-on-NwC’ composite electrode from the bottom current collector (coin cell casing), thus insulate from direct electrons source. An additional disk of NwC (Ø 12 mm, to prevent any electrical contacts on the edges of the coin cell casing) was placed at the bottom of the coin cell, in this case being in contact with electrons, and separated from the composite electrode by using additional layers of Celgard®2400 or Viledon®. Coin cells with different separation methods between NwC disk and ‘S-on-NwC’ electrode were made (Celgard®2400 or Viledon® only, or Celgard®2400 + Viledon®). The electrode loading was estimated to be ~ 6.2 mAh cm-2). Galvanostatic cycling was performed at low (C/100) rate. The initial discharge profiles are shown on Figure 3-28. Figure 3-28. Voltage profiles of the initial discharge of ‘insulated sulfur electrode’ cells. Cycling done at C/100 rate; estimated sulfur loading for each electrode: ~ 3.7 mgsulfur cm-2. As the electrode loadings were similar, the capacities only refer to mAh cm-2, in order to demonstrate the proof-of-concept of this special cell design. First, an initial polarization is visible, which is associated with the thickness of the separation layer(s) between the insulated sulfur electrode and the current collector: Celgard®2400 < Viledon® < Celgard®2400 + 104PDF Image | Accumulateur Lithium Soufre
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