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: Journal article publicationJournal articleAcademic researchpeer-review

    48 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 - 1 Mar 2018

    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

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