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

doi:10.1149/1.1377278

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

Department of Energy and Science and Engineering

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

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 language	English
Pages (from-to)	A716-A722
Journal	Journal of the Electrochemical Society
Volume	148
Issue number	7
DOIs	https://doi.org/10.1149/1.1377278
State	Published - Jul 2001

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10.1149/1.1377278

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@article{20a2a5ab52eb4445af819315d969629f,

title = "A Study on the Thermal Behavior of Electrochemically Delithiated Li 1-xNiO 2 ",

abstract = "Thermal behavior of electrochemically delithiated Li 1-xNiO 2 (R{\=3}m 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.",

author = "Lee, \{Kyung Keun\} and Yoon, \{Won Sub\} and Kim, \{Kwang Bum\} and Lee, \{Ki Young\} and Hong, \{Seung Tae\}",

year = "2001",

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doi = "10.1149/1.1377278",

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AU - Lee, Kyung Keun

AU - Yoon, Won Sub

AU - Kim, Kwang Bum

AU - Lee, Ki Young

AU - Hong, Seung Tae

PY - 2001/7

Y1 - 2001/7

N2 - 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.

AB - 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.

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A Study on the Thermal Behavior of Electrochemically Delithiated Li _1-xNiO ₂

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