Structural and electrochemical properties of LiAlyCo1-yO2 cathode for Li rechargeable batteries

Won Sub Yoon; Kyung Keun Lee; Kwang Bum Kim

doi:10.1149/1.1393479

Structural and electrochemical properties of LiAl_yCo_1-yO₂ cathode for Li rechargeable batteries

Won Sub Yoon, Kyung Keun Lee, Kwang Bum Kim

Department of Materials Science and Engineering

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

87 Citations (Scopus)

Abstract

LiAl_yCo_1-yO₂ powders were synthesized at 800°C using acrylic acid as a chelating agent. The comparison between local structure refinement of LiCoO₂ and LiAl_0.25Co_0.75O₂ during the charging and cycling process was carried out by Co K-edge X-ray absorption spectroscopy (XAS). Al addition was found to cause a larger local structure distortion during Li deintercalation compared to that of LiCoO₂. Extended X-ray absorption fine structure refinements during Li deintercalation showed that the degree of structural disorder around Co atoms in LiAl_0.25Co_0.75O₂ becomes higher than that of LiCoO₂. XAS analysis for LiCoO₂ and LiAl_0.25Co_0.75O₂ during cycling revealed that the large capacity fading of the LiAl_0.25Co_0.75O₂ electrode could be explained by the remaining Co⁴⁺ ions and local structure distortion.

Original language	English
Pages (from-to)	2023-2028
Number of pages	6
Journal	Journal of the Electrochemical Society
Volume	147
Issue number	6
DOIs	https://doi.org/10.1149/1.1393479
Publication status	Published - 2000 Jun

All Science Journal Classification (ASJC) codes

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

UN SDGs

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

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10.1149/1.1393479

Cite this

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title = "Structural and electrochemical properties of LiAlyCo1-yO2 cathode for Li rechargeable batteries",

abstract = "LiAlyCo1-yO2 powders were synthesized at 800°C using acrylic acid as a chelating agent. The comparison between local structure refinement of LiCoO2 and LiAl0.25Co0.75O2 during the charging and cycling process was carried out by Co K-edge X-ray absorption spectroscopy (XAS). Al addition was found to cause a larger local structure distortion during Li deintercalation compared to that of LiCoO2. Extended X-ray absorption fine structure refinements during Li deintercalation showed that the degree of structural disorder around Co atoms in LiAl0.25Co0.75O2 becomes higher than that of LiCoO2. XAS analysis for LiCoO2 and LiAl0.25Co0.75O2 during cycling revealed that the large capacity fading of the LiAl0.25Co0.75O2 electrode could be explained by the remaining Co4+ ions and local structure distortion.",

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AU - Yoon, Won Sub

AU - Lee, Kyung Keun

AU - Kim, Kwang Bum

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N2 - LiAlyCo1-yO2 powders were synthesized at 800°C using acrylic acid as a chelating agent. The comparison between local structure refinement of LiCoO2 and LiAl0.25Co0.75O2 during the charging and cycling process was carried out by Co K-edge X-ray absorption spectroscopy (XAS). Al addition was found to cause a larger local structure distortion during Li deintercalation compared to that of LiCoO2. Extended X-ray absorption fine structure refinements during Li deintercalation showed that the degree of structural disorder around Co atoms in LiAl0.25Co0.75O2 becomes higher than that of LiCoO2. XAS analysis for LiCoO2 and LiAl0.25Co0.75O2 during cycling revealed that the large capacity fading of the LiAl0.25Co0.75O2 electrode could be explained by the remaining Co4+ ions and local structure distortion.

AB - LiAlyCo1-yO2 powders were synthesized at 800°C using acrylic acid as a chelating agent. The comparison between local structure refinement of LiCoO2 and LiAl0.25Co0.75O2 during the charging and cycling process was carried out by Co K-edge X-ray absorption spectroscopy (XAS). Al addition was found to cause a larger local structure distortion during Li deintercalation compared to that of LiCoO2. Extended X-ray absorption fine structure refinements during Li deintercalation showed that the degree of structural disorder around Co atoms in LiAl0.25Co0.75O2 becomes higher than that of LiCoO2. XAS analysis for LiCoO2 and LiAl0.25Co0.75O2 during cycling revealed that the large capacity fading of the LiAl0.25Co0.75O2 electrode could be explained by the remaining Co4+ ions and local structure distortion.

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