Electrochemical Cycling and Lithium Insertion in Nanostructured FeF_3 Cathodes
Abstract
The cycle lives for cathodes of nanocrystalline iron trifluoride (FeF_3) were measured in rechargeable lithium batteries at different depths of discharge. When the discharge was limited to less than one Li^+ ion per FeF_3, both the cycle life and energy efficiency were considerably greater than when converting FeF_3 into Fe and LiF in deep discharge. An in situ X-ray diffractometry (XRD) study of the FeF_3 cathode during its initial discharge to LiFeF_3 showed a continuous change of the FeF_3 diffraction pattern, indicating Li^+ insertion into the rhombohedral FeF_3 causing distortion of its lattice parameters. Electrochemical cycling is most reversible when this mechanism occurs in the absence of other changes in the crystal structure.
Additional Information
© 2014 The Electrochemical Society. Manuscript submitted September 23, 2013; revised manuscript received December 30, 2013. Published January 16, 2014. The authors thank Dr. Ratnakumar Bugga at NASA Jet Propulsion Lab, Dr. Ilias Belharouak at Argonne National Lab, Dr. Meng Jiang at General Motors for insightful discussions, and Dr. Cedric Weiss at Contour for experimental assistance with the in situ apparatus. This work was supported as part of EFree, an Energy Frontier Research Center, under Award No. DE-SG0001057.Attached Files
Published - J._Electrochem._Soc.-2014-Tan-A445-9.pdf
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Additional details
- Alternative title
- Electrochemical Cycling and Lithium Insertion in Nanostructured FeF3 Cathodes
- Eprint ID
- 44690
- Resolver ID
- CaltechAUTHORS:20140407-104908427
- Department of Energy (DOE) Energy Frontier Research Center
- DE-SG0001057
- Created
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2014-04-07Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field