Journal
SOLID STATE IONICS
Volume 222, Issue -, Pages 23-30Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2012.06.024
Keywords
Li-ion battery; Conversion reactions; FeF3; EIS
Categories
Funding
- Fundamental Research Funds for the Central Universities [2010LKHX03, 2010QNB04, 2010QNB05]
- Jiangsu Ordinary University [CX10B_153Z]
- China University of Mining Technology [N090237]
Ask authors/readers for more resources
The FeF3/C composites were prepared by high energy milling, and its cyclic performance was characterized by discharge-charge measurements. The electrochemical impedance spectra (EIS) of FeF3/C cathode were obtained at different potentials during the initial discharge-charge cycle. The results show that the FeF3/C cathode exhibits an enhanced initial discharge capacity of 710 mAh/g (4.5-1.5 V) but shows a capacity retention of 40% after 100 cycles at room temperature. EIS of the FeF3/C cathode have revealed that the Nyquist plots of the typical EIS consist of two semicircles and one arc in an order of decreasing frequency during lithiation/delithiation. An equivalent circuit was proposed to simulate the experimental EIS data. The kinetic parameters of lithium ion and electron across the porous FeF3/C electrode in the first discharge-charge cycle are discussed in detail, offering some evidence that both the unstable SEI film on the electrode surface and the Schottky contact between metal-fluorides and conductive agents, can eventually affect the cyclic performance. (C) 2012 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