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

Fingerprint

Powders
calcium
Calcium
Ions
electric batteries
Electrodes
High resolution transmission electron microscopy
Electrochemical properties
Lithium
Nanostructured materials
Nanocomposites
Anodes
ions
cycles
Agglomeration
Nanostructures
Crystal structure
Nanoparticles
Transmission Electron Microscopy
destruction

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

Cite this

Electrochemical performance of calcium cobaltite nano-plates. / Kim, Dong-Wan; Ko, Young Dae; Park, Jong Sung; Je, Hae June; Son, Ji Won; Kim, Joosun.

In: Journal of Nanoscience and Nanotechnology, Vol. 9, No. 7, 01.07.2009, p. 4056-4060.

Research output: Contribution to journalArticle

Kim, Dong-Wan ; Ko, Young Dae ; Park, Jong Sung ; Je, Hae June ; Son, Ji Won ; Kim, Joosun. / Electrochemical performance of calcium cobaltite nano-plates. In: Journal of Nanoscience and Nanotechnology. 2009 ; Vol. 9, No. 7. pp. 4056-4060.
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