Thermal behavior of Li1-yNiO2 and the decomposition mechanism

Hajime Arai, Shigeto Okada, Yoji Sakurai, Jun Ichi Yamaki

Research output: Contribution to journalArticle

229 Citations (Scopus)

Abstract

We report the thermal behavior of Li1-yNiO2 up to 300°C which we investigated using thermogravimetry (TG) and differential scanning calorimetry (DSC). The decomposition mechanism was studied using the X-ray diffraction data obtained for the thermally decomposed products. At about 200°C Li1-yNiO2 turned into Li(1-y)/(2-y)Ni1/(2-y)O which has a rock-salt structure. This was accompanied by oxygen evolution. A significant exothermic process was observed for compounds with y ≥ 0.7 and this resulted in products with disordered rock-salt structures. Using these results, we propose a mechanism in which the exothermic behavior is caused by random cation mixing.

Original languageEnglish
Pages (from-to)295-302
Number of pages8
JournalSolid State Ionics
Volume109
Issue number3-4
DOIs
Publication statusPublished - Jun 2 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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