Germanium nanoparticle-dispersed reduced graphene oxide balls synthesized by spray pyrolysis for Li-ion battery anode

Jin Koo Kim, Gi Dae Park, Yun Chan Kang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Simple fabrication of a powdered Ge−reduced graphene oxide (Ge-rGO) composite via spray pyrolysis and reduction is introduced herein. Successful incorporation of the rGO nanosheets with Ge hindered the aggregation of Ge and conferred enhanced structural stability to the composite by alleviating the mechanical stress associated with drastic volume changes during repeated cycling. The Li-ion storage performance of Ge−rGO was compared with that of powdered Ge metal. The reversible discharge capacity of Ge−rGO at the 200 th cycle was 748 mA h g −1 at a current density of 1.0 A g −1 and Ge−rGO showed a capacity of 375 mA h g −1 even at a high current density of 5.0 A g −1 . The excellent performance of Ge−rGO is attributed to the structural robustness, enhanced electrical conductivity, and formation of open channels between the rGO nanosheets, which facilitated electrolyte penetration for improved Li-ion diffusion.

Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalJournal of the Korean Ceramic Society
Volume56
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Germanium
Spray pyrolysis
Graphite
Nanosheets
Oxides
Graphene
Anodes
Current density
Ions
Nanoparticles
Composite materials
Electrolytes
Agglomeration
Metals
Fabrication
Lithium-ion batteries
Electric Conductivity

Keywords

  • Carbon composite
  • Germanium
  • Graphene
  • Lithium ion batteries
  • Spray pyrolysis

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Germanium nanoparticle-dispersed reduced graphene oxide balls synthesized by spray pyrolysis for Li-ion battery anode. / Kim, Jin Koo; Park, Gi Dae; Kang, Yun Chan.

In: Journal of the Korean Ceramic Society, Vol. 56, No. 1, 01.01.2019, p. 65-70.

Research output: Contribution to journalArticle

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N2 - Simple fabrication of a powdered Ge−reduced graphene oxide (Ge-rGO) composite via spray pyrolysis and reduction is introduced herein. Successful incorporation of the rGO nanosheets with Ge hindered the aggregation of Ge and conferred enhanced structural stability to the composite by alleviating the mechanical stress associated with drastic volume changes during repeated cycling. The Li-ion storage performance of Ge−rGO was compared with that of powdered Ge metal. The reversible discharge capacity of Ge−rGO at the 200 th cycle was 748 mA h g −1 at a current density of 1.0 A g −1 and Ge−rGO showed a capacity of 375 mA h g −1 even at a high current density of 5.0 A g −1 . The excellent performance of Ge−rGO is attributed to the structural robustness, enhanced electrical conductivity, and formation of open channels between the rGO nanosheets, which facilitated electrolyte penetration for improved Li-ion diffusion.

AB - Simple fabrication of a powdered Ge−reduced graphene oxide (Ge-rGO) composite via spray pyrolysis and reduction is introduced herein. Successful incorporation of the rGO nanosheets with Ge hindered the aggregation of Ge and conferred enhanced structural stability to the composite by alleviating the mechanical stress associated with drastic volume changes during repeated cycling. The Li-ion storage performance of Ge−rGO was compared with that of powdered Ge metal. The reversible discharge capacity of Ge−rGO at the 200 th cycle was 748 mA h g −1 at a current density of 1.0 A g −1 and Ge−rGO showed a capacity of 375 mA h g −1 even at a high current density of 5.0 A g −1 . The excellent performance of Ge−rGO is attributed to the structural robustness, enhanced electrical conductivity, and formation of open channels between the rGO nanosheets, which facilitated electrolyte penetration for improved Li-ion diffusion.

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