Abstract
We studied the microstructural and electrochemical properties of Ti-doped Al2O3 (Ti-Al2O3) coated LiCoO 2 thin films depending on the Ti composition. The 1.27 at.% Ti-Al2O3 coated films had an amorphous structure with better conductivity than that of pure Al2O3 films. The Ti-Al2O3 coating layer effectively suppressed the dissolution of Co and the formation of lower Li conductivity SEI films at the interface between the LiCoO2 film and electrolyte. The Ti-Al 2O3 coating improved the cycling performance and capacity retention at high voltage (4.5 V) of the LiCoO2 films. The Ti-Al 2O3 coated LiCoO2 films showed better electrochemical properties than did the pure Al2O3 coated LiCoO2 films. These results were closely related to the enhanced Li-conductivity and interfacial quality of the Ti-Al2O3 film.
Original language | English |
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Pages (from-to) | 649-654 |
Number of pages | 6 |
Journal | Metals and Materials International |
Volume | 17 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2011 Aug |
Bibliographical note
Funding Information:This work was financially supported by the program Development of Basic Technology for Next Generation Li-Composite Secondary Batteries of KIST.
Keywords
- TiAlO coating
- electrochemistry
- encrgy storage materials
- sputtering
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry