High specific capacity retention of graphene/silicon nanosized sandwich structure fabricated by continuous electron beam evaporation as anode for lithium-ion batteries

Tatsuhiro Mori, Chih Jung Chen, Tai Feng Hung, Saad Gomaa Mohamed, Yi Qiao Lin, Hong Zheng Lin, James C. Sung, Shu Fen Hu, Ru Shi Liu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A graphene/silicon (Si) multilayer sandwich structures are fabricated using electron beam (EB) deposition without air exposure. The graphene and Si thin films are formed on Cu current correctors through a continuous process in high-vacuum EB chamber. Synthesized graphene should be suggested to the stacked multiple layer from Raman analysis. The fabricated multilayer films are used as anodes. In the beginning, the half-cell, which used a seven-layer of each thickness 50-nm graphene and Si film, exhibits good specific capacity retention over 1000 mA h g-1 after 30 charge/discharge cycles. The capacity value changed with the number of graphene and Si layers. In this study, the number of layers that exhibited optimal properties is seven. Morphological investigation showed a fine layer-by-layer structure. The relationship between different thicknesses of graphene and Si is investigated at 7 L. A 100-nm thickness exhibited optimal properties. Finally, the optimal 7 L and 100-nm thick graphene/Si exhibited high discharge capacitance >1600 mA h g-1 at a current density of 100 mA g-1 after 30 cycles. Initial coulombic and reversible efficiencies exceed 84%. The capacity retention (30th/1st discharge value) at 100 nm and 7 L exceeds 90%. Finally, the soft package battery is assembled by combining the fabricated graphene and Si electrode as anode, LiCoO2 as cathode, separator and liquid electrolyte. It can be used for commercial light-emitting diode (LED) lighting even under bending status.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
JournalElectrochimica Acta
Volume165
DOIs
Publication statusPublished - 2015 May 10

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Keywords

  • Anode material
  • Electron beam evaporation
  • Graphene/silicon multilayer structures
  • Layer-by-layer structures
  • Lithium-ion batteries

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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