Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating

Keon Kim, Hyung Wook Ha, Nan Ji Yun, Min Hyuk Kim, Myung Heui Woo

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

CeO2-coated LiCoO2 particles were successfully synthesized by a sol-gel coating of CeO2 on the surface of the LiCoO2 powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiCoO2 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Auger electron spectroscopy (AES), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Cyclic voltammetry curves suggested that the CeO2 coating suppressed the phase transitions. Unlike pristine LiCoO2, the CeO2-coated LiCoO2 cathode exhibited better capacity retention than the pristine LiCoO2 electrode in the higher cutoff voltage. Differential scanning calorimetric data revealed the higher thermal stability of the CeO2-coated LiCoO 2 electrode.

Original languageEnglish
Pages (from-to)3297-3302
Number of pages6
JournalElectrochimica Acta
Volume51
Issue number16
DOIs
Publication statusPublished - 2006 Apr 10

Keywords

  • CeO coating
  • LiCoO
  • Lithium batteries
  • Sol-gel synthesis
  • Surface modification

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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