A Study on the Thermal Behavior of Electrochemically Delithiated Li 1-xNiO 2

Kyung Keun Lee, Won Sub Yoon, Kwang Bum Kim, Ki Young Lee, Seung Tae Hong

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Thermal behavior of electrochemically delithiated Li 1-xNiO 2 (R3̄m or C2/m) up to 400°C was studied by thermogravimetry, differential scanning calorimetry, high temperature X-ray diffraction, and X-ray absorption measurements, and its thermal decomposition mechanism was proposed. Delithiated Li 1-xNiO 2 was thermally decomposed to a spinel phase (Fd3m) at around 220°C. For x ≤ 0.5, Li 1-xNiO 2 was decomposed to LiNiO 2 and LiNi 2O 4 and the fraction of the spinel in the decomposed product increased almost linearly with x. For x > 0.5, Li 1-xNiO 2 was converted into the spinel and this reaction was accompanied by oxygen evolution. On further heating, delithiated Li 1-xNiO 2 of all compositions turned into a rock salt phase (Fm3m) with NiO structure. The temperature for the decomposition of Li 1-xNiO 2 to a spinel was independent of x, however, the temperature for the decomposition to a rock salt phase decreased with increasing x. The thermal behavior of Li 1-xNiO 2 could be interpreted as an overlap of the exothermic rearrangement of nickel and lithium cations to form a spinel or a rock salt phase and the endothermic oxygen evolution reaction.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume148
Issue number7
DOIs
Publication statusPublished - 2001 Jul 1

Fingerprint

spinel
Rocks
halites
Salts
Decomposition
Oxygen
X ray absorption
Temperature
Thermogravimetric analysis
Differential scanning calorimetry
Lithium
Pyrolysis
decomposition
Positive ions
Nickel
Heating
oxygen
X ray diffraction
thermogravimetry
thermal decomposition

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Lee, Kyung Keun ; Yoon, Won Sub ; Kim, Kwang Bum ; Lee, Ki Young ; Hong, Seung Tae. / A Study on the Thermal Behavior of Electrochemically Delithiated Li 1-xNiO 2 In: Journal of the Electrochemical Society. 2001 ; Vol. 148, No. 7.
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A Study on the Thermal Behavior of Electrochemically Delithiated Li 1-xNiO 2 . / Lee, Kyung Keun; Yoon, Won Sub; Kim, Kwang Bum; Lee, Ki Young; Hong, Seung Tae.

In: Journal of the Electrochemical Society, Vol. 148, No. 7, 01.07.2001.

Research output: Contribution to journalArticle

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