X-ray absorption spectroscopic study of LiAlyCo1-yO2 cathode for Li rechargeable batteries

Won Sub Yoon, Kyung Keun Lee, Kwang Bum Kim

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21 Citations (Scopus)

Abstract

LiAlyCo1-yO2 powders were synthesized by the sol-gel process using acrylic acid as a chelating agent. The X-ray diffraction pattern for LiAl0.25Co0.75O2 powders calcined at 600°C or above shows that these materials have a well-developed layered HT-LiCoO2 structure. The capacity fading of the gel-derived LiAl0.25Co0.75O2 samples greatly decreased at lower temperatures. Galvanostatic cycling for the gel-derived LiAl0.25CO0.75O2 samples calcined at various temperatures indicates that electrodes calcined at 600°C show enhancement in capacity and cyclability. The variations in the local structures with Li deintercalation and cycling process of LiAl0.25Co0.75O2 were investigated as a function of calcination temperature using X-ray absorption spectroscopic technique. X-ray absorption near-edge structure and extended X-ray absorption fine structure results for LiAl0.25Co0.75O2 synthesized at 600 and 800°C during the charging and cycling process revealed that the large capacity fading of LiAl0.25Co0.75O2 synthesized at a higher temperature is strongly related to the remaining Co4+ ions and the local structure distortion.

Original languageEnglish
Pages (from-to)A146-A151
JournalJournal of the Electrochemical Society
Volume149
Issue number2
DOIs
Publication statusPublished - 2002 Feb

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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