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Figure 4j, the discharge capacity from 55 mAh g-1 in the 1st cycle dramatically decreases to 3 mAh g-1 in the 2nd cycle. The failure of pure S electrode could be due to the dissolution of polysulfide and irreversible precipitation formation. From the electrochemical performance of NGNS/S-H65 and NGNS/S-H86, it reveals that the conductive matrix could not efficiently prevent the dissolution of polysulfide, leading to the poor rate capability and poor reversibility with the increasing of cycle numbers. The CV results for high S loading samples also suggest that Na2S4 and Na2S2 are mainly involved during the reduction of sulfur, which were in good agreement with Janek et al.’s work.[5f, 15] From the CV curves of low loading (< 50% S) and high loading (>50% S) nanocomposites, the irreversible CV behaviors show that the dissolution of polysulfides leads to the incomplete redox reaction between Na and S after initial cycles. The absence of plateaus from the charge-discharge curves indicates the majority contribution of capacity coming from the sloping region reaction, i.e. Na2S8 + 2Na+ +2e- → 2Na2S4. In future, more detailed work need to be carried out to confirm the cell electrochemistry of RT Na-S batteries and how it affects the cell performance. 17 This article is protected by copyright. All rights reservedPDF Image | Nitrogen-Doped Graphene Nanosheets Composites as Cathode in Sodium-Sulfur Batteries
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