Journal
SOLID STATE IONICS
Volume 179, Issue 40, Pages 2390-2395Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2008.09.014
Keywords
Cr2O3; Overpotential; Impedance spectroscopy; Rechargeable lithium batteries; Thin film; Pulse laser deposition
Categories
Funding
- Natural Science Foundation of China [50672122, 50730005]
- 863 project [2006AA03Z346]
- 973 project [2007CB936501]
Ask authors/readers for more resources
The overpotentials of Cr2O3 thin film and powder electrodes as well as various benchmark anodes and cathodes in rechargeable lithium batteries have been compared by analyzing the galvanostatic voltage profiles. Li-storage in the Cr2O3 electrode through the conversion reaction shows higher overpotential values than through other Li-storage mechanisms. The origins of the high overpotential of the Cr2O3 electrode have been studied by electrochemical impedance spectroscopy. It is found that the ohmic polarization, charge transfer resistance and diffusion impedance of the Cr2O3 electrode decrease significantly with the insertion of lithium and increase with the extraction of lithium. The calculated overpotential contribution from the diffusion impedance is well consistent with the value deduced from the galvanostatic voltage profiles. It means that the sluggish diffusion should be the main origin for high polarization of Cr2O3 electrodes. (C) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available