Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating

Keon Kim; Hyung Wook Ha; Nan Ji Yun; Min Hyuk Kim; Myung Heui Woo

doi:10.1016/j.electacta.2005.09.023

Enhanced electrochemical and thermal stability of surface-modified LiCoO₂ cathode by CeO₂ coating

Keon Kim, Hyung Wook Ha, Nan Ji Yun, Min Hyuk Kim, Myung Heui Woo

* Honorary professors

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

64 Citations (Scopus)

Abstract

CeO₂-coated LiCoO₂ particles were successfully synthesized by a sol-gel coating of CeO₂ on the surface of the LiCoO₂ powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiCoO₂ powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Auger electron spectroscopy (AES), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Cyclic voltammetry curves suggested that the CeO₂ coating suppressed the phase transitions. Unlike pristine LiCoO₂, the CeO₂-coated LiCoO₂ cathode exhibited better capacity retention than the pristine LiCoO₂ electrode in the higher cutoff voltage. Differential scanning calorimetric data revealed the higher thermal stability of the CeO₂-coated LiCoO ₂ electrode.

Original language	English
Pages (from-to)	3297-3302
Number of pages	6
Journal	Electrochimica Acta
Volume	51
Issue number	16
DOIs	https://doi.org/10.1016/j.electacta.2005.09.023
Publication status	Published - 2006 Apr 10

Keywords

CeO coating
LiCoO
Lithium batteries
Sol-gel synthesis
Surface modification

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

Access to Document

10.1016/j.electacta.2005.09.023

Cite this

@article{622d3482c0f74dcc829b4be212e742ae,

title = "Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating",

abstract = "CeO2-coated LiCoO2 particles were successfully synthesized by a sol-gel coating of CeO2 on the surface of the LiCoO2 powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiCoO2 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Auger electron spectroscopy (AES), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Cyclic voltammetry curves suggested that the CeO2 coating suppressed the phase transitions. Unlike pristine LiCoO2, the CeO2-coated LiCoO2 cathode exhibited better capacity retention than the pristine LiCoO2 electrode in the higher cutoff voltage. Differential scanning calorimetric data revealed the higher thermal stability of the CeO2-coated LiCoO 2 electrode.",

keywords = "CeO coating, LiCoO, Lithium batteries, Sol-gel synthesis, Surface modification",

author = "Keon Kim and Ha, {Hyung Wook} and Yun, {Nan Ji} and Kim, {Min Hyuk} and Woo, {Myung Heui}",

note = "Funding Information: This research was supported by the Korea Science and Engineering Foundation through the Research Center for Energy Conversion & Storage, Korea. ",

year = "2006",

month = apr,

day = "10",

doi = "10.1016/j.electacta.2005.09.023",

language = "English",

volume = "51",

pages = "3297--3302",

journal = "Electrochimica Acta",

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TY - JOUR

T1 - Enhanced electrochemical and thermal stability of surface-modified LiCoO2 cathode by CeO2 coating

AU - Kim, Keon

AU - Ha, Hyung Wook

AU - Yun, Nan Ji

AU - Kim, Min Hyuk

AU - Woo, Myung Heui

N1 - Funding Information: This research was supported by the Korea Science and Engineering Foundation through the Research Center for Energy Conversion & Storage, Korea.

PY - 2006/4/10

Y1 - 2006/4/10

N2 - CeO2-coated LiCoO2 particles were successfully synthesized by a sol-gel coating of CeO2 on the surface of the LiCoO2 powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiCoO2 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Auger electron spectroscopy (AES), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Cyclic voltammetry curves suggested that the CeO2 coating suppressed the phase transitions. Unlike pristine LiCoO2, the CeO2-coated LiCoO2 cathode exhibited better capacity retention than the pristine LiCoO2 electrode in the higher cutoff voltage. Differential scanning calorimetric data revealed the higher thermal stability of the CeO2-coated LiCoO 2 electrode.

AB - CeO2-coated LiCoO2 particles were successfully synthesized by a sol-gel coating of CeO2 on the surface of the LiCoO2 powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiCoO2 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Auger electron spectroscopy (AES), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Cyclic voltammetry curves suggested that the CeO2 coating suppressed the phase transitions. Unlike pristine LiCoO2, the CeO2-coated LiCoO2 cathode exhibited better capacity retention than the pristine LiCoO2 electrode in the higher cutoff voltage. Differential scanning calorimetric data revealed the higher thermal stability of the CeO2-coated LiCoO 2 electrode.

KW - CeO coating

KW - LiCoO

KW - Lithium batteries

KW - Sol-gel synthesis

KW - Surface modification

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DO - 10.1016/j.electacta.2005.09.023

M3 - Article

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VL - 51

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JO - Electrochimica Acta

JF - Electrochimica Acta

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