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could be attributed to the conductive network established by both S and NGNS, relatively low S loading, and stronger binding effect from N-doped graphene with mitigated shuttle effect. Although there are partial dissolution of polysulfides during cycling and low loading composites exhibit the best electrochemical performance among other loadings, it is worthy to be noted that the performance of NGNS is also involved with several factors, such as the type of N functional groups, the N content in the NGNS, and structural property of NGNS induced by N-doping, etc. Based on our work, further improvement with high loading of S can be expected by optimizing the concentration of N functional groups as well as creating nano-pores of N-doped graphene. In future work, more efforts need to be done to improve the S loading in the composite materials and to understand how loading and different types and different quantity of functional groups affect the performance improvement. Conclusions In summary, we have demonstrated NGNS/S nanocomposites with different sulfur loading as electrode materials for RT Na-S batteries, respectively. In these nanocomposites, sulfur has been phase-transferred from alpha-S8 to gamma-S8 during the thermal treatment progress. The NGNS/S-H25 nanocomposite exhibits a better electrochemical performance in terms of rate capability and cyclability as compared to other higher loading NGNS/S nanocomposites. This electrochemical improvement can be attributed to the conductive network established by both S and NGNS for enhanced Na+ transport. NGNS as confinement host played a relatively effective role in immobilizing low loading of sulfur and confining polysulfides during cycling. To achieve the high loading of sulfur with best electrochemical performance, 22 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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