Design and synthesis of metal oxide hollow nanopowders for lithium-ion batteries by combining nanoscale Kirkendall diffusion and flame spray pyrolysis

Jong Min Won, Jong Hwa Kim, Yun Ju Choi, Jung Sang Cho, Yun Chan Kang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This study introduces an efficient process that combines a gas phase reaction method and nanoscale Kirkendall diffusion for the large-scale production of metal-oxide hollow nanopowders. Core-shell-structured NiO@SiO 2 nanopowders prepared by flame spray pyrolysis are transformed into hollow NiO@SiO 2 nanopowders via a nanoscale Kirkendall diffusion process. The SiO 2 coating layer plays a key role in preventing the sintering and growth of the Ni or NiO nanopowders during the preparation process. The mean size of hollow core and shell thickness of the hollow NiO nanopowders are 11 and 7 nm, respectively. At a current density of 0.5 A g -1 , the NiO@SiO 2 nanopowders with hollow and filled structures exhibit 100th cycle discharge capacities of 885 and 338 mA h g -1 , respectively. In addition, the hollow NiO@SiO 2 nanopowders, which exhibit low charge transfer resistances and fast Li-ion diffusion rates, also show better cycling and rate performance than the nanopowders with filled structures.

Original languageEnglish
Pages (from-to)5461-5471
Number of pages11
JournalCeramics International
Volume42
Issue number4
DOIs
Publication statusPublished - 2016 Mar 1

Keywords

  • Flame spray pyrolysis
  • Kirkendall diffusion
  • Lithium ion battery
  • Nickel oxide

ASJC Scopus subject areas

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

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