Intercalation behavior of LiCoO2 electrodes in aqueous alkaline electrolytes by microparticle cyclic voltammetry

S. Frangini, M. Carewska, S. Passerini, S. Scaccia

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Abstract

The electrochemical behavior in alkaline solutions of a stoichiometric layered LiCoO2 compound has been examined by means of cyclic voltammetry (CV) of powders mechanically attached onto a Pt substrate (microparticle voltammetry). CV profiles were found to be quite different depending on the nature of the electrolyte considered. Only in 10M NaOH a set of four intercalation processes in the potential range (4-4.6V vs Li reference) was recorded. The redox reactions are tentatively explained as due to a complex intercalation mechanism which proceeds through participation of the relatively large hydrated Na cations and gradual expansion of the host interlayer spacing. The influence of continuous potential cycling, scan rate and electrolytic concentration on the voltammetric response of LiCoO2 was also discussed. In summary, it is proved that LiCoO2 may represent a viable new cathode material to be applied in aqueous Na intercalation cells.
Original languageEnglish
Pages (from-to)83 - 88
Number of pages6
JournalJournal of New Materials for Electrochemical Systems
Volume4
Issue number2
Publication statusPublished - 2001

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All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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