Metallic and polar Co9S8 inlaid carbon hollow nanopolyhedra as efficient polysulfide mediator for lithium−sulfur batteries


Journal Article

© 2017 Elsevier Ltd Lithium−sulfur (Li−S) batteries are promising to replace current commercial Li−ion batteries due to the high energy density. Despite this, the poor cyclic stability induced by the shuttle effect of electrolyte-soluble intermediate polysulfides is one of the great obstacles for the application of Li−S batteries. To overcome this issue, here we report a self-template synthesis of metallic and polar Co9S8 nanocrystals inlaid carbon (Co9S8/C) hollow nanopolyhedra as an efficient sulfur host material. The Co9S8/C hollow nanopolyhedra with large inner space can ensure the loading mass of sulfur and buffer the volume expansion of Li2Sx species during cycling; while the metallic and polar Co9S8/C shell offers synergetic spatial confinement and chemical binding to immobilize polysulfides and prevent the shutting effect. The Co9S8/C-S composite cathode exhibits high capacity and long cycle life with a low capacity decay of 0.041% per cycle over 1000 cycles at 2.0 C. When the areal sulfur content is as high as 3.0 mg cm–2, the Co9S8/C-S cathode still maintains high cycling stability.

Full Text

Duke Authors

Cited Authors

  • Chen, T; Ma, L; Cheng, B; Chen, R; Hu, Y; Zhu, G; Wang, Y; Liang, J; Tie, Z; Liu, J; Jin, Z

Published Date

  • August 1, 2017

Published In

Volume / Issue

  • 38 /

Start / End Page

  • 239 - 248

International Standard Serial Number (ISSN)

  • 2211-2855

Digital Object Identifier (DOI)

  • 10.1016/j.nanoen.2017.05.064

Citation Source

  • Scopus