Although the melt-diffusion method was applied to fabricate sulfur-based cathode for lithium-sulfur batteries,more efforts should be devoted to the development of synthetic methodology of sulfur-based hybrids.Herein,w...Although the melt-diffusion method was applied to fabricate sulfur-based cathode for lithium-sulfur batteries,more efforts should be devoted to the development of synthetic methodology of sulfur-based hybrids.Herein,we report a sulfur-hydrazine hydrate chemistry-based method to prepare the composite of sulfur and N-doped reduced graphene oxide(S@N-rGO)with 76%sulfur content.Relying on the reaction of sulfur and hydrazine hydrate,cyclo-sulfur was broken to form soluble polysulfides.The subsequent refluxing with GO suspension rendered the transformation of soluble polysulfides to sulfur crystal homogeneously deposited on N-rGO due to direct nucleation from solution.Simultaneously,the nitrogen doping of GO was realized with hydrazine hydrate as doping agent in the one-pot route.The as-obtained S@NrGO composite displayed a good rate capability and excellent capacity stability up to 300 cycles.This study may provide a new and facile method to construct the composite of sulfur and N-doped carbonaceous matrix,which makes the hybrid a competitive cathode material for lithium-sulfur batteries(LSBs).展开更多
基金the financial support provided by the National Natural Science Fund of China(21601108)Young Scholars Program of Shandong University(2017WLJH15)+1 种基金the Fundamental Research Funds of Shandong University(no.2016JC033)the Taishan Scholar Project of Shandong Province(no.ts201511004).
文摘Although the melt-diffusion method was applied to fabricate sulfur-based cathode for lithium-sulfur batteries,more efforts should be devoted to the development of synthetic methodology of sulfur-based hybrids.Herein,we report a sulfur-hydrazine hydrate chemistry-based method to prepare the composite of sulfur and N-doped reduced graphene oxide(S@N-rGO)with 76%sulfur content.Relying on the reaction of sulfur and hydrazine hydrate,cyclo-sulfur was broken to form soluble polysulfides.The subsequent refluxing with GO suspension rendered the transformation of soluble polysulfides to sulfur crystal homogeneously deposited on N-rGO due to direct nucleation from solution.Simultaneously,the nitrogen doping of GO was realized with hydrazine hydrate as doping agent in the one-pot route.The as-obtained S@NrGO composite displayed a good rate capability and excellent capacity stability up to 300 cycles.This study may provide a new and facile method to construct the composite of sulfur and N-doped carbonaceous matrix,which makes the hybrid a competitive cathode material for lithium-sulfur batteries(LSBs).
