Abstract
The positive effect of AlF 3 (Al-F) coating on the over-lithiated transition metal oxide with a composition of 0.5Li 2MnO 3·0.5LiNi 0.5Co 0.2Mn 0.3O 2 has been investigated to address its potential use in lithium ion batteries. On the basis of various structural and electrochemical characterizations, we elucidate a correlation between surface structure and its electrochemical performance. After the controlled coating with AlF 3 (Al-F), we observed notable improvements on cyclic performance and rate capability as well as thermal stability. We found that uniformly introduced AlF 3 (Al-F) not only preserves the electrochemical kinetics at the surface of the oxide but also stabilizes its surface as a protective layer against electrolyte oxidation during the high voltage charging. Such improvements will provide a further progress on the development of high-capacity cathode materials fulfilled with the stringent safety requirements.
Original language | English |
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Pages (from-to) | 20-25 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 517 |
DOIs | |
Publication status | Published - 2012 Mar 15 |
Keywords
- Aluminum fluoride
- Cathode
- Lithium ion battery
- Oxide
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry