Mesoporous graphitic carbon-TiO2 composite microspheres produced by a pilot-scale spray-drying process as an efficient sulfur host material for Li-S batteries

Gi Dae Park, Jeongyeon Lee, Yuanzhe Piao, Yun Chan Kang

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Mesoporous graphitic carbon-TiO2 composite microspheres are fabricated by a facile process and used as an effective sulfur host material for Li-sulfur batteries (LSBs). Composite microspheres are several microns in size and with uniform size distributions that contained maltodextrin, iron nitrate, and TiO2 nanocrystals are formed using a pilot-scale spray-drying process, then transform into graphitic carbon-TiO2 composite microspheres with numerous empty nanovoids by a single post-treatment step and subsequent etching of metallic iron. The composite carbon microspheres not only have high pore volumes after the removal of metallic iron, providing sufficient spaces for the infiltration of sulfur, but also increase electronic conductivity in electrodes due to the graphitic carbon. Consequently, a high specific capacity of 516 mA h g−1 at a current density of 5 C and a reversible capacity of 599 mA h g−1 after 600 cycles at a current density of 1 C are achieved, indicating the excellent capability of the material for use in energy storage devices. The structure of the mesoporous graphitic carbon-TiO2 composite microspheres make them suitable for use as a host material in sulfur cathodes and can significantly improve the electrochemical performances of LSBs.

Original languageEnglish
Pages (from-to)600-611
Number of pages12
JournalChemical Engineering Journal
Volume335
DOIs
Publication statusPublished - 2018 Mar 1

Fingerprint

Spray drying
Microspheres
Sulfur
spray
Carbon
sulfur
carbon
Composite materials
Iron
iron
Current density
etching
Infiltration
Nitrates
Nanocrystals
Energy storage
Etching
electrode
Cathodes
infiltration

Keywords

  • Graphitic carbon
  • Lithium-sulfur batteries
  • Mesoporous material
  • Spray drying
  • Titanium oxide

ASJC Scopus subject areas

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

Cite this

Mesoporous graphitic carbon-TiO2 composite microspheres produced by a pilot-scale spray-drying process as an efficient sulfur host material for Li-S batteries. / Park, Gi Dae; Lee, Jeongyeon; Piao, Yuanzhe; Kang, Yun Chan.

In: Chemical Engineering Journal, Vol. 335, 01.03.2018, p. 600-611.

Research output: Contribution to journalArticle

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