Thermal behavior and the decomposition mechanism of electrochemically delithiated Li1-xNiO2

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

Research output: Contribution to journalConference article

38 Citations (Scopus)

Abstract

Thermal behavior of Li1-xNiO2 (R3̄m or C2/m) up to 400°C was studied using thermogravimetry (TG), differential scanning calorimetry (DSC), and high-temperature X-ray diffraction measurements and its decomposition mechanism was proposed. Delithiated Li1-xNiO2 was thermally decomposed to LiNi2O4 spinel (Fd3m) at the temperature range of 180-250°C. For x ≤ 0.5, Li1-xNiO2 was decomposed to LiNiO2 and LiNi2O4 and the fraction of the spinel in the decomposed product increased almost linearly with x. For 0.5 < x ≤ 0.8, Li1-xNiO2 was converted into LiNi2O4 spinel and this reaction was accompanied by oxygen evolution. Li1-xNiO2 of all compositions turned into a rock-salt phase (Fm3m) with oxygen liberation at temperatures above 270°C. The temperature for the decomposition of Li1-xNiO2 to a spinel or a rock-salt phase decreased with x in Li1-xNiO2. The thermal behavior of Li1-xNiO2 could be interpreted as an overlap of the exothermic rearrangement of cations (nickel and lithium ions) to form a spinel or a rock-salt phase and the endothermic oxygen evolution reaction.

Original languageEnglish
Pages (from-to)321-325
Number of pages5
JournalJournal of Power Sources
Volume97-98
DOIs
Publication statusPublished - 2001 Jul 1
Event10th International Meeting on Lithium Batteries - Como, Italy
Duration: 2001 May 282001 Jun 2

Fingerprint

spinel
halites
Decomposition
decomposition
Rocks
Salts
Oxygen
oxygen
Temperature
Thermogravimetric analysis
Differential scanning calorimetry
thermogravimetry
Nickel
Lithium
Positive ions
temperature
Cations
X ray diffraction
heat measurement
lithium

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Lee, Kyung Keun ; Yoon, Won Sub ; Kim, Kwang Bum ; Lee, Ki Young ; Hong, Seung Tae. / Thermal behavior and the decomposition mechanism of electrochemically delithiated Li1-xNiO2. In: Journal of Power Sources. 2001 ; Vol. 97-98. pp. 321-325.
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abstract = "Thermal behavior of Li1-xNiO2 (R3̄m or C2/m) up to 400°C was studied using thermogravimetry (TG), differential scanning calorimetry (DSC), and high-temperature X-ray diffraction measurements and its decomposition mechanism was proposed. Delithiated Li1-xNiO2 was thermally decomposed to LiNi2O4 spinel (Fd3m) at the temperature range of 180-250°C. For x ≤ 0.5, Li1-xNiO2 was decomposed to LiNiO2 and LiNi2O4 and the fraction of the spinel in the decomposed product increased almost linearly with x. For 0.5 < x ≤ 0.8, Li1-xNiO2 was converted into LiNi2O4 spinel and this reaction was accompanied by oxygen evolution. Li1-xNiO2 of all compositions turned into a rock-salt phase (Fm3m) with oxygen liberation at temperatures above 270°C. The temperature for the decomposition of Li1-xNiO2 to a spinel or a rock-salt phase decreased with x in Li1-xNiO2. The thermal behavior of Li1-xNiO2 could be interpreted as an overlap of the exothermic rearrangement of cations (nickel and lithium ions) to form a spinel or a rock-salt phase and the endothermic oxygen evolution reaction.",
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Thermal behavior and the decomposition mechanism of electrochemically delithiated Li1-xNiO2. / Lee, Kyung Keun; Yoon, Won Sub; Kim, Kwang Bum; Lee, Ki Young; Hong, Seung Tae.

In: Journal of Power Sources, Vol. 97-98, 01.07.2001, p. 321-325.

Research output: Contribution to journalConference article

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