Various improvement of LiNi0.5Mn1.5O4 cathode materials of lithium ion battery for high-voltage application
- Various improvement of LiNi0.5Mn1.5O4 cathode materials of lithium ion battery for high-voltage application
- 최원창; 이용호; 김동원; 이중기
- Issue Date
- 16th International Meeting on Lithium Batteries (IMLB2012)
- Spinel LiNi0.5Mn1.5O4 cathodes, considered a promising due to its high voltage around 4.7 V and low cost, have not been adopted in commercial lithium ion battery system owing to the stability issues of commercial LiPF6-based electrolyte, especially, at the charged state. With an aim to improve the electrochemical performances and to develop a better understanding of the capacity fade mechanisms of lithium nickel manganese cathodes, we examined the electrochemical properties of cathodes with various surface-modification techniques in which inorganic oxides as well as copper metal was utilized to modify the surface of LiNi0.5Mn1.5O4cathodes. Incorporation of heterogeneous material or layer on the surface of cathode material was found to have superior-capacity retention as well as improved storage characteristics at elevated temperatures, suggesting that the appropriate surface-modification is effective to enhance the electrochemical performances of lithium ion battery in high-voltage and elevated temperature environment. The in-depth analyses such as impedance spectroscopy, X-ray photoelectron spectroscopy, and raman spectroscopy to elucidate the role of surface-modification will be addressed for the high-voltage application of cathode materials in lithium-ion battery system.
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