• 文献标题:   Ferroconcrete-Like Helical Carbon Nanotube/Reduced Graphene Oxide Heterostructure 3D Networks as Sulfur Hosts for High-Performance Li-S Batteries
  • 文献类型:   Article
  • 作  者:   LUO ZB, TAO ZR, LI XY, XU DD, XUAN CX, WANG Z, TANG T, WEN JF, LI M, XIAO JR
  • 作者关键词:   helical carbon nanotube, reduced graphene oxide, heterostructure, 3d hybrid material, lithiumsulfur batterie
  • 出版物名称:   FRONTIERS IN ENERGY RESEARCH
  • ISSN:   2296-598X
  • 通讯作者地址:   Guilin Univ Technol
  • 被引频次:   1
  • DOI:   10.3389/fenrg.2019.00157
  • 出版年:   2020

▎ 摘  要

A novel helical Carbon nanotubes (HCNT) network with a reduced graphene oxide (rGO) coating was designed and fabricated through a synergistic self-assembly and sulfuration strategy for use as an effective sulfur (S) host. A ferroconcrete frame structure with a hierarchical 3D nanostructure composed of 1D HCNT and 2D rGO nanosheets was obtained. The rGO wraps around the HCNT to form a heterostructure and provide an apparent coating that protects S. HCNT in the composite is boosted to create a 3D network architecture and reinforce the structural stability. Moreover, the heterostructures and rGO coatings, which are rich in wrinkles, can greatly minimize direct contact between the polysulfide and electrolyte; they also provide an abundance of active sites and boundary defects. Furthermore, the 3D interconnected structure creates effective ion diffusion channels and allows effective trapping of S and Li polysulfides. When used as a cathode, the HCNT/rGO/S cathode exhibits a high initial specific capacity of 1,196 mAh g(-1) at 0.1 C. The capacity decay rate of the HCNT/rGO/S is only 0.075% per cycle after cycling for 200 times at a rate of 0.1 C. This unique hybrid HCNT/rGO/S electrode design may motivate the development of other high-performance electrodes with excellent electrochemical properties.