Electrochemical properties of CuO hollow nanopowders prepared from formless Cu-C composite via nanoscale Kirkendall diffusion process

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Hollow CuO nanopowders are prepared using a simple spray drying process that relied on nanoscale Kirkendall diffusion; these nanopowders have potential applications in lithium-ion batteries. Citric acid is used as both the carbon source material and chelating agent and plays a key role in the preparation of the hollow nanopowders. The formless Cu-C composite that formed as an intermediate product transforms into slightly aggregated CuO hollow nanopowders after post-treatment at 300 and 400 °C under an air atmosphere. The CuO hollow nanopowders exhibit higher initial discharge capacities and better cycling performances than those of the filled-structured CuO nanopowders, which are prepared at a post-treatment temperature of 500 °C under an air atmosphere. The discharge capacities of the CuO nanopowders post-treated at 300, 400, and 500 °C for the 150 th cycle at a current density of 1 A g -1 are 793, 632, and 464 mA h g -1 , respectively, and their capacity retentions calculated from the maximum discharge capacities are 88, 80, and 73%, respectively. The CuO nanopowders with hollow structures exhibit better structural stability for repeated lithium insertion and desertion processes than those with filled structures.

Original languageEnglish
Pages (from-to)74-83
Number of pages10
JournalJournal of Alloys and Compounds
Volume671
DOIs
Publication statusPublished - 2016 Jun 25

Keywords

  • Anode material
  • Copper oxide
  • Kirkendall diffusion
  • Lithium-ion battery
  • Spray drying

ASJC Scopus subject areas

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

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