Electrochemical evaluation and structural characterization of commercial LiCoO2 surfaces modified with MgO for lithium-ion batteries

Zhaoxiang Wang; Chuan Wu; Lijun Liu; Feng Wu; Liquan Chen; Xuejie Huang

doi:10.1149/1.1456919

Electrochemical evaluation and structural characterization of commercial LiCoO₂ surfaces modified with MgO for lithium-ion batteries

Zhaoxiang Wang^*, Chuan Wu, Lijun Liu, Feng Wu, Liquan Chen, Xuejie Huang

^*Corresponding author for this work

School of Material Science and Engineering

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

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Abstract

Commercial cathode material LiCoO₂ was modified by coating its surface with a thin layer of amorphous magnesium oxide (MgO). The surface morphology, crystalline structure, and electrochemical performance of the modified cathode material were characterized and compared with that of pristine LiCoO₂. It is found that surface modification can improve the structural stability of LiCoO₂ without decreasing its available specific capacity. Specific capacities of 145, 175, and 210 mAh/g were obtained in test cells composed of MgO-coated LiCoO₂ cathode material when charged to 4.3, 4.5, and 4.7 V (Li⁺/Li), respectively. This improvement is attributed to the pillaring effect of the Mg²⁺ ions in the interslab space of the lattice and the protective effect of the MgO film against the escape of Co⁴⁺ ions from the bulk of LiCoO₂ particles.

Original language	English
Pages (from-to)	A466-A471
Journal	Journal of the Electrochemical Society
Volume	149
Issue number	4
DOIs	https://doi.org/10.1149/1.1456919
Publication status	Published - Apr 2002

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title = "Electrochemical evaluation and structural characterization of commercial LiCoO2 surfaces modified with MgO for lithium-ion batteries",

abstract = "Commercial cathode material LiCoO2 was modified by coating its surface with a thin layer of amorphous magnesium oxide (MgO). The surface morphology, crystalline structure, and electrochemical performance of the modified cathode material were characterized and compared with that of pristine LiCoO2. It is found that surface modification can improve the structural stability of LiCoO2 without decreasing its available specific capacity. Specific capacities of 145, 175, and 210 mAh/g were obtained in test cells composed of MgO-coated LiCoO2 cathode material when charged to 4.3, 4.5, and 4.7 V (Li+/Li), respectively. This improvement is attributed to the pillaring effect of the Mg2+ ions in the interslab space of the lattice and the protective effect of the MgO film against the escape of Co4+ ions from the bulk of LiCoO2 particles.",

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T1 - Electrochemical evaluation and structural characterization of commercial LiCoO2 surfaces modified with MgO for lithium-ion batteries

AU - Wang, Zhaoxiang

AU - Wu, Chuan

AU - Liu, Lijun

AU - Wu, Feng

AU - Chen, Liquan

AU - Huang, Xuejie

PY - 2002/4

Y1 - 2002/4

N2 - Commercial cathode material LiCoO2 was modified by coating its surface with a thin layer of amorphous magnesium oxide (MgO). The surface morphology, crystalline structure, and electrochemical performance of the modified cathode material were characterized and compared with that of pristine LiCoO2. It is found that surface modification can improve the structural stability of LiCoO2 without decreasing its available specific capacity. Specific capacities of 145, 175, and 210 mAh/g were obtained in test cells composed of MgO-coated LiCoO2 cathode material when charged to 4.3, 4.5, and 4.7 V (Li+/Li), respectively. This improvement is attributed to the pillaring effect of the Mg2+ ions in the interslab space of the lattice and the protective effect of the MgO film against the escape of Co4+ ions from the bulk of LiCoO2 particles.

AB - Commercial cathode material LiCoO2 was modified by coating its surface with a thin layer of amorphous magnesium oxide (MgO). The surface morphology, crystalline structure, and electrochemical performance of the modified cathode material were characterized and compared with that of pristine LiCoO2. It is found that surface modification can improve the structural stability of LiCoO2 without decreasing its available specific capacity. Specific capacities of 145, 175, and 210 mAh/g were obtained in test cells composed of MgO-coated LiCoO2 cathode material when charged to 4.3, 4.5, and 4.7 V (Li+/Li), respectively. This improvement is attributed to the pillaring effect of the Mg2+ ions in the interslab space of the lattice and the protective effect of the MgO film against the escape of Co4+ ions from the bulk of LiCoO2 particles.

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Electrochemical evaluation and structural characterization of commercial LiCoO₂ surfaces modified with MgO for lithium-ion batteries

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