Thermoanalytical study of synthesis of mixed lithium cobalt oxides

M. Carewska, A. Di Bartolomeo, S. Scaccia

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Abstract

The synthesis of LiCoO2from different precursor mixtures, such as Li2CO3Co3O4, Li(CH3COO)·2H2O-Co3O4, Li2CO3-2CoCO3·3Co(OH)2and Li(CH3COO)·2H2O-Co(CH3COO)2·4H2O in air has been studied by means of TG, DTG and DTA techniques. The thermal events have been characterized by X-ray diffraction and chemical analysis. It is suggested that the synthesis proceeds through reaction between lithium carbonate and cobalt oxide intermediates. A lower synthesis temperature has been observed in the case of acetate precursors. The effect of the precursor on the electrical properties of the samples has been also studied. Measurements of electrical conductivity in the temperature range 600 to 900°C in air show typical semiconductive behaviour for all the samples of LiCoO2. The Arrhenius plots show two linear regions with a temperature break due to phase transition near 850°C. The two values of activation energies in the temperature ranges 600-820 and 850-900°C have been found to be similar for all the samples, suggesting that the conduction behaviour should not be influenced by the nature of the precursor. © 1995.
Original languageEnglish
Pages (from-to)491 - 506
Number of pages16
JournalThermochimica Acta
Volume269-270
Issue numberC
DOIs
Publication statusPublished - 20 Dec 1995

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Instrumentation

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