Pitch-derived yolk-shell-structured carbon microspheres as efficient sulfur host materials and their application as cathode material for Li–S batteries

Gi Dae Park, Dae Soo Jung, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Submicron and micron-sized carbon spheres with high electrical conductivity, micro–mesoporous structure, and empty space are considered ideal sulfur host materials for Li–S batteries. In this study, a new and efficient strategy for the synthesis of yolk-shell-structured carbon microspheres with multishells is introduced. Pitch-derived carbon microspheres with yolk-shell structure, high pore volume, and high electrical conductivity are synthesized by applying yolk-shell-structured Fe 2 O 3 microspheres as a sacrificial template. Pitch-infiltrated Fe 2 O 3 microspheres transform into yolk-shell-structured carbon (YS_C) microspheres with a specific conductivity of 0.9 S cm −1 after post-treatment and etching with an HCl solution. The discharge capacity of the sulfur-loaded YS_C microspheres for the 200th cycle at a current density of 0.5 C is 686 mA h g −1 , and their reversible capacity after 800 cycles at a high current density of 2 C is 412 mA h g −1 . In addition, the sulfur-loaded YS_C microspheres show excellent cycling performance, despite their very high sulfur loading of 70 wt%. The excellent cycling and rate performances of the sulfur-loaded YS_C microspheres are attributed to the synergistic effect of the high electrical conductivity of YS_C microspheres, loading of amorphous and ultrafine sulfur, and empty shell layers.

Original languageEnglish
Pages (from-to)382-392
Number of pages11
JournalChemical Engineering Journal
Volume373
DOIs
Publication statusPublished - 2019 Oct 1

Keywords

  • Carbon microspheres
  • Lithium-sulfur batteries
  • Pitch derived carbon
  • Porous carbon
  • Yolk-shell structure

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Pitch-derived yolk-shell-structured carbon microspheres as efficient sulfur host materials and their application as cathode material for Li–S batteries'. Together they form a unique fingerprint.

  • Cite this