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

21 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, LiCoO 2 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

Fingerprint

Sandwich structures
Graphite
Silicon
Graphene
Electron beams
Anodes
Evaporation
Lithium-ion batteries
Multilayer films
Separators
Electrolytes
Light emitting diodes
Multilayers
Cathodes
Current density
Capacitance
Lighting
Vacuum
Thin films
Electrodes

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

Cite this

High specific capacity retention of graphene/silicon nanosized sandwich structure fabricated by continuous electron beam evaporation as anode for lithium-ion batteries. / Mori, Tatsuhiro; Chen, Chih Jung; Hung, Tai Feng; Mohamed, Saad Gomaa; Lin, Yi Qiao; Lin, Hong Zheng; Sung, James C.; Hu, Shu-Fen; Liu, Ru Shi.

In: Electrochimica Acta, Vol. 165, 10.05.2015, p. 166-172.

Research output: Contribution to journalArticle

Mori, Tatsuhiro ; Chen, Chih Jung ; Hung, Tai Feng ; Mohamed, Saad Gomaa ; Lin, Yi Qiao ; Lin, Hong Zheng ; Sung, James C. ; Hu, Shu-Fen ; Liu, Ru Shi. / High specific capacity retention of graphene/silicon nanosized sandwich structure fabricated by continuous electron beam evaporation as anode for lithium-ion batteries. In: Electrochimica Acta. 2015 ; Vol. 165. pp. 166-172.
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AU - Mohamed, Saad Gomaa

AU - Lin, Yi Qiao

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AU - Sung, James C.

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AB - 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, LiCoO 2 as cathode, separator and liquid electrolyte. It can be used for commercial light-emitting diode (LED) lighting even under bending status.

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