Electrochemical properties of amorphous GeO x -C composite microspheres prepared by a one-pot spray pyrolysis process

Jin Koo Kim, Gi Dae Park, Jung Hyun Kim, Jong Hwa Kim, Yun Chan Kang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Amorphous GeO 2 -GeO-C (GeO x -C) composite powders, containing a small amount of the GeC phase, are prepared by a one-pot spray pyrolysis process. The GeO x -C composite powders have a completely spherical shape and are non-aggregated. The Ge 3d components in the XPS spectrum of the composite occupy 53.3%, 40.1%, and 6.6% of the total for GeO 2 , GeO, and GeC, respectively. The amount of amorphous carbon in the GeO x -C composite powder is estimated at 18.3%, based on the TG and XPS analysis. The initial discharge and charge capacities of the GeO x -C composite powders at a current density of 1 A g −1 are 1873 and 908 mA h g −1 , respectively. The discharge capacities of the GeO x -C composite and commercial GeO 2 powders for the 1200th cycle are 723 and 169 mA h g −1 , respectively, and their corresponding capacity retentions from the 2nd cycle are 70.1% and 19.0%, respectively. The high structural stability of the composite during repeated lithium insertion and desertion processes results in excellent long-term cycling performance.

Original languageEnglish
Pages (from-to)5534-5540
Number of pages7
JournalCeramics International
Volume43
Issue number7
DOIs
Publication statusPublished - 2017 May 1

Fingerprint

Spray pyrolysis
Microspheres
Electrochemical properties
Powders
Composite materials
X ray photoelectron spectroscopy
Amorphous carbon
Lithium
Current density

Keywords

  • Anode material
  • Carbon composite
  • Germanium oxide
  • Lithium-ion batteries
  • Spray pyrolysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Electrochemical properties of amorphous GeO x -C composite microspheres prepared by a one-pot spray pyrolysis process . / Kim, Jin Koo; Park, Gi Dae; Kim, Jung Hyun; Kim, Jong Hwa; Kang, Yun Chan.

In: Ceramics International, Vol. 43, No. 7, 01.05.2017, p. 5534-5540.

Research output: Contribution to journalArticle

Kim, Jin Koo ; Park, Gi Dae ; Kim, Jung Hyun ; Kim, Jong Hwa ; Kang, Yun Chan. / Electrochemical properties of amorphous GeO x -C composite microspheres prepared by a one-pot spray pyrolysis process In: Ceramics International. 2017 ; Vol. 43, No. 7. pp. 5534-5540.
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abstract = "Amorphous GeO 2 -GeO-C (GeO x -C) composite powders, containing a small amount of the GeC phase, are prepared by a one-pot spray pyrolysis process. The GeO x -C composite powders have a completely spherical shape and are non-aggregated. The Ge 3d components in the XPS spectrum of the composite occupy 53.3{\%}, 40.1{\%}, and 6.6{\%} of the total for GeO 2 , GeO, and GeC, respectively. The amount of amorphous carbon in the GeO x -C composite powder is estimated at 18.3{\%}, based on the TG and XPS analysis. The initial discharge and charge capacities of the GeO x -C composite powders at a current density of 1 A g −1 are 1873 and 908 mA h g −1 , respectively. The discharge capacities of the GeO x -C composite and commercial GeO 2 powders for the 1200th cycle are 723 and 169 mA h g −1 , respectively, and their corresponding capacity retentions from the 2nd cycle are 70.1{\%} and 19.0{\%}, respectively. The high structural stability of the composite during repeated lithium insertion and desertion processes results in excellent long-term cycling performance.",
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