Nitrogen-doped carbon nanotubes coated with zinc oxide nanoparticles as sulfur encapsulator for high-performance lithium/sulfur batteries

Yan Zhao, Zhengjun Liu, Liancheng Sun, Yongguang Zhang, Yuting Feng, Xin Wang, Indira Kurmanbayeva, Zhumabay Bakenov

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Nitrogen-doped carbon nanotubes coated with zinc oxide nanoparticles (ZnO@NCNT) were prepared via a sol-gel route as sulfur encapsulator for lithium/sulfur (Li/S) batteries. The electrochemical properties of the S/ZnO@NCNT composite cathode were evaluated in Li/S batteries. It delivered an initial capacity of 1032 mAh·g-1 at a charge/discharge rate of 0.2C and maintained a reversible capacity of 665 mAh·g-1 after 100 cycles. The coulombic efficiency of the cathode remains unchanged above 99%, showing stable cycling performance. X-ray photoelectron spectroscopy analysis confirmed the formation of S-Zn and S-O bonds in the composite. This indicates that an enhanced cycling and rate capability of the S/ZnO@NCNT composite could be ascribed to advantages of the ZnO@NCNT matrix. In the composite, the active ZnO-rich surfaces offer a high sulfur-bonding capability and the NCNT core acts as a conductive framework providing pathways for ion and electron transport. The as-prepared S/ZnO@NCNT composite is a promising cathode material for Li/S batteries.

Original languageEnglish
Pages (from-to)1677-1685
Number of pages9
JournalBeilstein Journal of Nanotechnology
Volume9
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Keywords

  • Batteries
  • Nanocomposites
  • Sol-gel processes
  • Sulfur
  • Zinc oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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