Low-temperature synthesis of LiNiO2: Reaction mechanism, stability, and electrochemical properties

M. R. Palacín, D. Larcher, A. Audemer, N. Sac-Épée, G. G. Amatucci, J. M. Tarascon

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A thorough study was made concerning the formation of LiNiO2 by a low-temperature ion-exchange reaction under hydrothermal conditions. LiNiO2 with a low degree of cationic mixing and good electrochemical performance was prepared either from pure β-NiOOH, γ-NiOOH, or a mixture of both where the γ phase was the majority. The synthesized product (LT-LiNiO2) presents electrochemical properties similar to LiNiO2 prepared by conventional powder synthesis (HT-LiNiO2) in spite of the difference in Brunauer, Emmett, and Teller (BET) surfaces, around 20 m2/g for LT-LiNiO2 and 0.7 m2/g for HT-LiNiO2. The thermal and moisture stabilities of LT-LiNiO2 were studied and turned out to be much lower than those of HT-LiNiO2. This moisture instability was found (i) to be intrinsic to LiNiO2, since ground HT-LiNiO2 samples presented a similar behavior, (ii) to be enhanced by decreasing the LiNiO2 particle size, and (iii) to be much larger than that of LiCoO2. In view of electrochemical applications, cobalt-substituted products should be used in order to ensure the stability against both reduction-delithiation and hydrolysis.

Original languageEnglish (US)
Pages (from-to)4226-4236
Number of pages11
JournalJournal of the Electrochemical Society
Issue number12
StatePublished - Dec 1997
Externally publishedYes

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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