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

doi:10.1016/S0378-7753(01)00548-1

Thermal behavior and the decomposition mechanism of electrochemically delithiated Li_1-xNiO₂

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

49 Citations (Scopus)

Abstract

Thermal behavior of Li_1-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 Li_1-xNiO₂ was thermally decomposed to LiNi₂O₄ spinel (Fd3m) at the temperature range of 180-250°C. For x ≤ 0.5, Li_1-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, Li_1-xNiO₂ was converted into LiNi₂O₄ spinel and this reaction was accompanied by oxygen evolution. Li_1-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 Li_1-xNiO₂ to a spinel or a rock-salt phase decreased with x in Li_1-xNiO₂. The thermal behavior of Li_1-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 language	English
Pages (from-to)	321-325
Number of pages	5
Journal	Journal of Power Sources
Volume	97-98
DOIs	https://doi.org/10.1016/S0378-7753(01)00548-1
Publication status	Published - 2001 Jul
Event	10th International Meeting on Lithium Batteries - Como, Italy Duration: 2001 May 28 → 2001 Jun 2

Bibliographical note

Funding Information:
Authors would like to thank LG Chemical Ltd. for financial support and Korea Basic Institute for TG and DSC Measurement. This study was supported by the Brain Korea 21 project.

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/S0378-7753(01)00548-1

Cite this

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title = "Thermal behavior and the decomposition mechanism of electrochemically delithiated Li1-xNiO2",

abstract = "Thermal behavior of Li1-xNiO2 (R{\=3}m 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.",

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

note = "Funding Information: Authors would like to thank LG Chemical Ltd. for financial support and Korea Basic Institute for TG and DSC Measurement. This study was supported by the Brain Korea 21 project.; 10th International Meeting on Lithium Batteries ; Conference date: 28-05-2001 Through 02-06-2001",

year = "2001",

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doi = "10.1016/S0378-7753(01)00548-1",

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journal = "Journal of Power Sources",

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T1 - Thermal behavior and the decomposition mechanism of electrochemically delithiated Li1-xNiO2

AU - Lee, Kyung Keun

AU - Yoon, Won Sub

AU - Kim, Kwang Bum

AU - Lee, Ki Young

AU - Hong, Seung Tae

N1 - Funding Information: Authors would like to thank LG Chemical Ltd. for financial support and Korea Basic Institute for TG and DSC Measurement. This study was supported by the Brain Korea 21 project.

PY - 2001/7

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N2 - 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.

AB - 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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