Superior electrochemical properties of SiO2-doped Co3O4 hollow nanospheres obtained through nanoscale Kirkendall diffusion for lithium-ion batteries

Jong Min Won, Jung Sang Cho, Yun Chan Kang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Hollow SiO2-doped Co3O4 (Si-Co3O4) nanospheres with excellent Li-ion storage properties were synthesized via flame spray pyrolysis by applying a nanoscale Kirkendall diffusion process. A solid SiO2-doped CoO (filled Si-CoO) nanopowder was prepared through this process, and then it was transformed into hollow Si-Co3O4 nanopowder by way of a core-shell-structured Co-SiO2 (filled Co@Si-CoO) composite nanopowder. In addition, the direct oxidation of the filled Si-CoO nanopowder at 300 °C under an air atmosphere resulted in the formation of a solid SiO2-doped Co3O4 (filled Si-Co3O4) nanopowder. At a high current density of 2 A g-1, the hollow Si-Co3O4 nanospheres exhibited a 150th-cycle discharge capacity of 971 mA h g-1 and capacity retention of 99.5%, which was measured relative to the second cycle. However, the corresponding capacity retentions of the filled Si-CoO and Si-Co3O4 nanopowders were only 82.2% and 71.5%, respectively. The high structural stability during cycling and high Li-ion conductivity, which are caused by the hollow structure, are responsible for the excellent Li-ion storage properties of the hollow Si-Co3O4 nanospheres obtained through nanoscale Kirkendall diffusion.

Original languageEnglish
Pages (from-to)366-372
Number of pages7
JournalJournal of Alloys and Compounds
Volume680
DOIs
Publication statusPublished - 2016 Sep 25

    Fingerprint

Keywords

  • Anode material
  • Cobalt oxide
  • Flame spray pyrolysis
  • Kirkendall diffusion
  • Lithium-ion battery

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this