High-coulombic-efficiency Si-based hybrid microspheres synthesized by the combination of graphene and IL-derived carbon

Sang Hoon Park, Dongjoon Ahn, Young Min Choi, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The low initial coulombic efficiency of a Si-based anode can hinder the performance of practical full-cell Li-ion batteries (LIBs), as the irreversible capacity loss of the anode can diminish the reversible full-cell capacity and the energy efficiency. Therefore, it is critical to develop high-coulombic-efficiency Si-based anode materials from a practical perspective. To this end, we developed a high-coulombic-efficiency Si-based hybrid anode material with suitable cycling performance by developing a spray-assisted assembly process based on a combination of graphene and ionic liquid (IL). During the assembly process, the IL was trapped between the graphene and Si nanoparticles. Then, it was easily converted into IL-derived carbon, to generate additional protective/binding layers in the resultant Si-based hybrid microspheres. This IL-derived carbon layer played an important role in improving the electrochemical performance of the Si-based hybrid microspheres. The resultant Si-based hybrid microsphere electrode exhibited enhanced initial coulombic efficiency along with improved cycling performance, owing to the formation of the protective/binding carbon layers derived from the IL.

Original languageEnglish
Pages (from-to)20935-20943
Number of pages9
JournalJournal of Materials Chemistry A
Volume3
Issue number42
DOIs
Publication statusPublished - 2015 Jul 27

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Ionic Liquids
Graphite
Microspheres
Ionic liquids
Graphene
Carbon
Anodes
Energy efficiency
Nanoparticles
Electrodes

All Science Journal Classification (ASJC) codes

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

Cite this

Park, Sang Hoon ; Ahn, Dongjoon ; Choi, Young Min ; Roh, Kwang Chul ; Kim, Kwang Bum. / High-coulombic-efficiency Si-based hybrid microspheres synthesized by the combination of graphene and IL-derived carbon. In: Journal of Materials Chemistry A. 2015 ; Vol. 3, No. 42. pp. 20935-20943.
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High-coulombic-efficiency Si-based hybrid microspheres synthesized by the combination of graphene and IL-derived carbon. / Park, Sang Hoon; Ahn, Dongjoon; Choi, Young Min; Roh, Kwang Chul; Kim, Kwang Bum.

In: Journal of Materials Chemistry A, Vol. 3, No. 42, 27.07.2015, p. 20935-20943.

Research output: Contribution to journalArticle

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