A N-doped graphene-cobalt nickel sulfide aerogel as a sulfur host for lithium-sulfur batteries

Ping Wu, Hai Yan Hu, Ning Xie, Chen Wang, Fan Wu, Ming Pan, Hua Fei Li, Xiao Di Wang, Zheling Zeng, Shuguang Deng, Gui Ping Dai

Research output: Contribution to journalArticle

Abstract

Herein, three-dimensional (3D) N-doped reduced graphene oxide (N-rGO) nanosheets were decorated with a uniform distribution of Co-Ni-S (CNS) nanoparticles to form the CNS/N-rGO composite as a sulfur host material for lithium-sulfur batteries. The CNS nanoparticles and N in CNS/N-rGO strongly interact with polysulfides, whereas graphene, as a conductive network, can improve its electrical conductivity. A CNS/N-rGO/sulfur composite cathode was prepared via the sulfur melting diffusion method. The electrochemical study showed that the CNS/N-rGO/sulfur cathode delivered an initial discharge capacity of 1430 mA h g-1 at a current density of 0.1C. Moreover, it retained a specific capacity of 685 mA h g-1 after 300 cycles at 0.5C with a coulombic efficiency of 98%, which was better than that of commercial rGO. This composite was used as a sulfur cathode for a lithium-sulfur battery, exhibiting excellent rate capability and remarkable performance in terms of long cycling stability.

Original languageEnglish (US)
Pages (from-to)32247-32257
Number of pages11
JournalRSC Advances
Volume9
Issue number55
DOIs
StatePublished - Jan 1 2019

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Wu, P., Hu, H. Y., Xie, N., Wang, C., Wu, F., Pan, M., Li, H. F., Wang, X. D., Zeng, Z., Deng, S., & Dai, G. P. (2019). A N-doped graphene-cobalt nickel sulfide aerogel as a sulfur host for lithium-sulfur batteries. RSC Advances, 9(55), 32247-32257. https://doi.org/10.1039/c9ra05202j