Mesoporous graphitic carbon microspheres with a controlled amount of amorphous carbon as an efficient Se host material for Li-Se batteries

Young Jun Hong, Kwang Chul Roh, Yun Chan Kang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Synthesis of graphitic carbon (GC) microspheres with well-developed mesopores, high pore volumes, and high electrical conductivities remains a challenge in the energy storage field including Li-Se batteries. In this study, GC-TiO microspheres with optimum structures are synthesized as host materials for amorphous elemental Se by the modification of activated carbon (A-C) microspheres. Some amount of amorphous carbon (AC) is transformed into GC using Fe nanocatalysts. TiO nanocrystals reduced the crystal growth of Fe nanocatalysts during the formation of GC layers. The selective oxidation of AC in the microporous GC-AC-Fe-TiO composite microspheres at 350 °C with a controlled oxygen content and the subsequent HCl etching process produced mesoporous GC-TiO composite microspheres with a controlled amount of AC. High-volume mesopores with pore sizes ranging between 4 and 50 nm are generated after the formation of GC-TiO microspheres. The GC-TiO/Se microspheres with a high Se loading of 70 wt%, which is achieved by the melt inclusion process, exhibit excellent electrochemical properties as a cathode material for Li-Se batteries. The discharge capacities of GC-TiO/Se microspheres for the 850th cycle at a current density of 0.5C is 584 mA h g-1, and the capacity retention measured from the second cycle is 84%.

Original languageEnglish
Pages (from-to)4152-4160
Number of pages9
JournalJournal of Materials Chemistry A
Volume6
Issue number9
DOIs
Publication statusPublished - 2018 Jan 1

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Amorphous carbon
Microspheres
Carbon
Composite materials
Crystallization
Electrochemical properties
Activated carbon
Nanocrystals
Energy storage
Pore size
Crystal growth
Etching
Cathodes
Current density
Oxygen
Oxidation

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Mesoporous graphitic carbon microspheres with a controlled amount of amorphous carbon as an efficient Se host material for Li-Se batteries. / Hong, Young Jun; Roh, Kwang Chul; Kang, Yun Chan.

In: Journal of Materials Chemistry A, Vol. 6, No. 9, 01.01.2018, p. 4152-4160.

Research output: Contribution to journalArticle

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