One-pot Aerosol Synthesis of Carbon Nanotube-Zn 2 GeO 4 Composite Microspheres for Enhanced Lithium-ion Storage Properties

Seung Ho Choi, Jong Hwa Kim, Yun Ju Choi, Yun Chan Kang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Three-dimensional (3D) carbon nanotube (CNT)-multicomponent metal oxide composite microspheres with non-aggregation characteristics are prepared using a simple one-pot spray pyrolysis process, applying water-soluble metal salt and oxidized CNT fibers. The hierarchical porous 3D structure of the CNT is formed by networking the flexible CNTs with a high aspect ratio during the drying stage of a droplet. Subsequently, the Zn and Ge salts are deposited over the CNTs to form the ZnO-CNT and GeO 2 -CNT composite microsphere. Decomposition of Zn and Ge salts into their respective oxides and the conversion reaction to form Zn 2 GeO 4 at 700 °C, produce the Zn 2 GeO 4 -CNT composite microsphere. The initial discharge capacities of the Zn 2 GeO 4 , Zn 2 GeO 4 -CNT, ZnO-CNT, and GeO 2 -CNT microspheres, at a current density of 1.5 A g -1 , are 1351, 1211, 1387, and 1631 mA h g -1 , respectively, and their discharge capacities at the 300 th cycle are 415, 762, 261, and 480 mA h g -1 , respectively. The CNT-Zn 2 GeO 4 composite microspheres, selected as the first target material, show electrochemical properties superior to those of the bare Zn 2 GeO 4 , CNT-ZnO, and CNT-GeO 2 composite microspheres. The synergetic effect of the multicomponent composition of Zn 2 GeO 4 and the CNT support result in excellent Li-ion storage properties of the Zn 2 GeO 4 -CNT composite microspheres.

Original languageEnglish
Pages (from-to)766-774
Number of pages9
JournalElectrochimica Acta
Volume190
DOIs
Publication statusPublished - 2016 Feb 1

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Carbon Nanotubes
Aerosols
Microspheres
Lithium
Carbon nanotubes
Ions
Composite materials
Salts
Oxides
Metals
Spray pyrolysis
Electrochemical properties
Aspect ratio

Keywords

  • anode material
  • carbon composite
  • carbon nanotube
  • lithium ion battery

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

One-pot Aerosol Synthesis of Carbon Nanotube-Zn 2 GeO 4 Composite Microspheres for Enhanced Lithium-ion Storage Properties . / Choi, Seung Ho; Kim, Jong Hwa; Choi, Yun Ju; Kang, Yun Chan.

In: Electrochimica Acta, Vol. 190, 01.02.2016, p. 766-774.

Research output: Contribution to journalArticle

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AB - Three-dimensional (3D) carbon nanotube (CNT)-multicomponent metal oxide composite microspheres with non-aggregation characteristics are prepared using a simple one-pot spray pyrolysis process, applying water-soluble metal salt and oxidized CNT fibers. The hierarchical porous 3D structure of the CNT is formed by networking the flexible CNTs with a high aspect ratio during the drying stage of a droplet. Subsequently, the Zn and Ge salts are deposited over the CNTs to form the ZnO-CNT and GeO 2 -CNT composite microsphere. Decomposition of Zn and Ge salts into their respective oxides and the conversion reaction to form Zn 2 GeO 4 at 700 °C, produce the Zn 2 GeO 4 -CNT composite microsphere. The initial discharge capacities of the Zn 2 GeO 4 , Zn 2 GeO 4 -CNT, ZnO-CNT, and GeO 2 -CNT microspheres, at a current density of 1.5 A g -1 , are 1351, 1211, 1387, and 1631 mA h g -1 , respectively, and their discharge capacities at the 300 th cycle are 415, 762, 261, and 480 mA h g -1 , respectively. The CNT-Zn 2 GeO 4 composite microspheres, selected as the first target material, show electrochemical properties superior to those of the bare Zn 2 GeO 4 , CNT-ZnO, and CNT-GeO 2 composite microspheres. The synergetic effect of the multicomponent composition of Zn 2 GeO 4 and the CNT support result in excellent Li-ion storage properties of the Zn 2 GeO 4 -CNT composite microspheres.

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