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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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The effect of Al2O3 coating on the cycle life performance in thin-film LiCoO2 cathodes

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Title
The effect of Al2O3 coating on the cycle life performance in thin-film LiCoO2 cathodes
Author
Kim, YJKim, TJShin, JWPark, BCho, Jaephil
Keywords
RECHARGEABLE LITHIUM BATTERIES; PULSED-LASER DEPOSITION; ION CELL; INTERCALATION; MICROSTRUCTURE; LIXCOO2
Issue Date
2002-10
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.149, no.10, pp.A1337 - A1341
Abstract
The electrochemical stability of LiCoO2 films is improved by an ∼10 nm Al2O3 coating on top of the thin-film cathode material. Galvanostatic charge/discharge experiments showed enhanced electrochemical properties in the Al2O3-coated LiCoO2 films than the bare ones. This phenomenon is related to the faster Li diffusion rate in the Al2O3-coated samples, as evidenced by cyclic voltammograms. This provides easier pathways for Li-ion migration by forming a thin-film solid solution layer (LiCo1-xAlxOz). Similar results were observed in LiCoO2 powders, showing enhanced cycle performance after coating with a thin-film metal-oxide coating. However, unlike the powder geometry, both bare and Al2O3-coated LiCoO2 thin films showed negligible c axis expansion.
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DOI
10.1149/1.1505634
ISSN
0013-4651
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ECHE_Journal Papers
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