Electrochemical properties of amorphous GeOx-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

doi:10.1016/j.ceramint.2017.01.076

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 journal › Article › peer-review

10 Citations (Scopus)

Abstract

Amorphous GeO₂-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 GeO₂, 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 GeO₂ 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 language	English
Pages (from-to)	5534-5540
Number of pages	7
Journal	Ceramics International
Volume	43
Issue number	7
DOIs	https://doi.org/10.1016/j.ceramint.2017.01.076
Publication status	Published - 2017 May 1

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2015R1A2A1A15056049).

Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ceramint.2017.01.076

Cite this

@article{80409554d88c454fb69fa95654b38e1b,

title = "Electrochemical properties of amorphous GeOx-C composite microspheres prepared by a one-pot spray pyrolysis process",

abstract = "Amorphous GeO2-GeO-C (GeOx-C) composite powders, containing a small amount of the GeC phase, are prepared by a one-pot spray pyrolysis process. The GeOx-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 GeO2, GeO, and GeC, respectively. The amount of amorphous carbon in the GeOx-C composite powder is estimated at 18.3%, based on the TG and XPS analysis. The initial discharge and charge capacities of the GeOx-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 GeOx-C composite and commercial GeO2 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.",

keywords = "Anode material, Carbon composite, Germanium oxide, Lithium-ion batteries, Spray pyrolysis",

author = "Kim, {Jin Koo} and Park, {Gi Dae} and Kim, {Jung Hyun} and Kim, {Jong Hwa} and Kang, {Yun Chan}",

note = "Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2015R1A2A1A15056049). Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd and Techna Group S.r.l.",

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T1 - Electrochemical properties of amorphous GeOx-C composite microspheres prepared by a one-pot spray pyrolysis process

AU - Kim, Jin Koo

AU - Park, Gi Dae

AU - Kim, Jung Hyun

AU - Kim, Jong Hwa

AU - Kang, Yun Chan

N1 - Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2015R1A2A1A15056049). Publisher Copyright: © 2017 Elsevier Ltd and Techna Group S.r.l.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Amorphous GeO2-GeO-C (GeOx-C) composite powders, containing a small amount of the GeC phase, are prepared by a one-pot spray pyrolysis process. The GeOx-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 GeO2, GeO, and GeC, respectively. The amount of amorphous carbon in the GeOx-C composite powder is estimated at 18.3%, based on the TG and XPS analysis. The initial discharge and charge capacities of the GeOx-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 GeOx-C composite and commercial GeO2 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.

AB - Amorphous GeO2-GeO-C (GeOx-C) composite powders, containing a small amount of the GeC phase, are prepared by a one-pot spray pyrolysis process. The GeOx-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 GeO2, GeO, and GeC, respectively. The amount of amorphous carbon in the GeOx-C composite powder is estimated at 18.3%, based on the TG and XPS analysis. The initial discharge and charge capacities of the GeOx-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 GeOx-C composite and commercial GeO2 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.

KW - Anode material

KW - Carbon composite

KW - Germanium oxide

KW - Lithium-ion batteries

KW - Spray pyrolysis

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