Electrochemical properties of micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres

Jin Sung Park, Jung Sang Cho, Jong Hwa Kim, Yun Ju Choi, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres are prepared by applying Ostwald ripening and Kirkendall effect to the spray pyrolysis process. The Co-C composite powders uniformly dispersed with different sizes of metallic Co nanocrystals are formed by reduction of the cobalt oxide-carbon composite powders prepared using spray pyrolysis. Subsequent oxidation of the Co-C composite powders with filled structures forms the micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres. The mean sizes of the Co3O4hollow nanospheres oxidized from Co-C composite powders formed at reduction temperatures of 400, 600, and 800 °C are 37, 55, and 73 nm, respectively. The discharge capacities of the Co3O4powders formed from the Co-C composite powders reduced at temperatures of 400, 600, and 800 °C for the 300thcycle are 644, 702, and 660 mA h g−1, respectively, and their capacity retentions calculated from the second cycle are 81, 86, and 84%, respectively. The porous-structured Co3O4powders formed from the Co-C composite powders reduced at 800 °C show slightly better rate performance than those of the other two samples.

Original languageEnglish
Pages (from-to)554-563
Number of pages10
JournalJournal of Alloys and Compounds
Volume689
DOIs
Publication statusPublished - 2016

Keywords

  • Anode material
  • Cobalt oxide
  • Kirkendall diffusion
  • Lithium ion battery
  • Ostwald ripening
  • Spray pyrolysis

ASJC Scopus subject areas

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

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