Electrochemical Stability of Thin-Film LiCoO2 Cathodes by Aluminum-Oxide Coating

High-performance thin-film LiCoO2 cathodes were successfully fabricated by aluminum-oxide coating. Both the galvanostatic charge−discharge experiments and the cyclic voltammograms (CVs) showed enhanced electrochemical properties in the Al2O3-coated LiCoO2 films compared to those in the uncoated ones...

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Bibliographic Details
Published in:Chemistry of materials 2003-04, Vol.15 (7), p.1505-1511
Main Authors: Kim, Yong Jeong, Kim, Hyemin, Kim, Byoungsoo, Ahn, Donggi, Lee, Joon-Gon, Kim, Tae-Joon, Son, Dongyeon, Cho, Jaephil, Kim, Young-Woon, Park, Byungwoo
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
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Summary:High-performance thin-film LiCoO2 cathodes were successfully fabricated by aluminum-oxide coating. Both the galvanostatic charge−discharge experiments and the cyclic voltammograms (CVs) showed enhanced electrochemical properties in the Al2O3-coated LiCoO2 films compared to those in the uncoated ones. The improved cycling behaviors in the coated samples are caused by the suppression of cobalt dissolution from the LiCoO2 thin films, with the formation of an aluminum-oxide solid electrolyte residing between the LiCoO2 cathode and liquid electrolyte. Galvanostatic intermittent titration technique (GITT) results clearly showed that the Al2O3-coated samples had higher Li diffusivities than the uncoated ones after 80 cycles. The effect of Al2O3 thickness on the electrochemical properties up to 300 nm was also studied.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm0201403