Electrochemical performance of calcium cobaltite nano-plates

Dong-Wan Kim, Young Dae Ko, Jong Sung Park, Hae June Je, Ji Won Son, Joosun Kim

Research output: Contribution to journalArticle

Abstract

The use of nanostructured materials in Li-ion batteries is desirable from the point of view of achieving enhanced performance, due to the shorter Li-ion diffusion distance and the small dimensional changes upon cycling. Herein, the nanocrystalline calcium cobaltite (Ca 3Co 4O 9) powders were prepared by the Pechini process. The obtained nano-plate powders have a thickness of the order of 10-50 nm and a diameter of around 300 nm. We investigated the electrochemical properties of Ca 3Co 4O 9 as a potential new anode material with high capacity for Li-ion batteries. In addition, the mechanism of Li reactivity was successfully explained using high resolution transmission electron microscopy. The full reduction of Ca 3Co 4O 9 by lithium leads to the destruction of crystal structure and subsequent formation of a nanocomposite electrode containing Co, Li 2O, CaO, and a polymeric layer. The inactive CaO matrix is expected to mitigate the aggregation of the Co nanoparticles on continued cycling, thereby improving the capacity retention.

Original languageEnglish
Pages (from-to)4056-4060
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number7
DOIs
Publication statusPublished - 2009 Jul 1
Externally publishedYes

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Keywords

  • Ca Co O
  • Li-ion batteries
  • Nano-plates
  • Nanocomposite

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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