Electrochemical and structural characterization of LiNi1-yCoyO2 (0 ≤ y ≤ 0.2) positive electrodes during initial cycling

Kyung Keun Lee, Kwang Bum Kim

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The initial charge/discharge behavior of LiNi1-yCoyO2 (0 ≤ y ≤ 0.2) positive electrodes has been closely examined by neutron diffraction, X-ray diffraction, X-ray absorption, and electrochemical methods. Charge/discharge experiments and neutron diffraction refinements show that capacity loss during the initial cycling of LiNi1-yCoyO2 (0 ≤ y ≤ 0.2) increases linearly with the excess nickel content controlled by cobalt substitution for nickel. Charge/discharge cycling with gradually increasing depth of charge indicates that most of the initial capacity loss takes place in the early stages of the first charge. X-ray absorption near-edge spectra reveal that the nickel and cobalt ions in Li1-xNi1-yCoyO2 are simultaneously oxidized and that the local structure of MO6 (M = Ni, Co) octahedra is slightly distorted upon lithium deintercalation.

Original languageEnglish
Pages (from-to)1709-1717
Number of pages9
JournalJournal of the Electrochemical Society
Issue number5
Publication statusPublished - 2000 May

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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