One-pot Aerosol Synthesis of Carbon Nanotube-Zn2GeO4 Composite Microspheres for Enhanced Lithium-ion Storage Properties

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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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 GeO2-CNT composite microsphere. Decomposition of Zn and Ge salts into their respective oxides and the conversion reaction to form Zn2GeO4 at 700 °C, produce the Zn2GeO4-CNT composite microsphere. The initial discharge capacities of the Zn2GeO4, Zn2GeO4-CNT, ZnO-CNT, and GeO2-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 300th cycle are 415, 762, 261, and 480 mA h g-1, respectively. The CNT-Zn2GeO4 composite microspheres, selected as the first target material, show electrochemical properties superior to those of the bare Zn2GeO4, CNT-ZnO, and CNT-GeO2 composite microspheres. The synergetic effect of the multicomponent composition of Zn2GeO4 and the CNT support result in excellent Li-ion storage properties of the Zn2GeO4-CNT composite microspheres.

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


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

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry


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