Journal
SOLID STATE IONICS
Volume 230, Issue -, Pages 86-91Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2012.08.003
Keywords
Surface coating; Electrochemical properties; Cathode; Lithium battery; Interface
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2009-0071073]
- Converging Research Center Program through the Ministry of Education, Science and Technology [2012K001263]
- National Research Foundation of Korea [2009-0071073] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The electrochemical properties and interface reactions of pristine and coated LiCoO2 films were characterized. MgF2 was used as a new coating material to improve the electrochemical properties of the LiCoO2 film electrode. To directly observe the interface reaction between the surface of the cathode and the electrolyte, a film electrode with a wide, flat surface was introduced in this study. The rate capability, cyclic performance, and stability at high temperature of the LiCoO2 thin film were improved by MgF2 coating. The concentration-depth profile and surface image of the LiCoO2 film were investigated by SEM and XPS analyses before and after cycling. Pristine film showed significant Co dissolution and surface damage on cycling at high temperature (45 degrees C). However, both were efficiently depressed by the introduction of the MgF2 coating. These results confirm that the MgF2 coating layer successfully protected the surface of the cathode from the reactive electrolyte, leading to enhanced electrochemical properties for MgF2-coated LiCoO2 films. (c) 2012 Elsevier B.V. All rights reserved.
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