Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1291190 | Journal of Power Sources | 2009 | 7 Pages |
Abstract
We report here the performance of FeSb2 used as negative electrode for Li-ions batteries. A capacity of 400 mAh g−1 and 3500 mAh cm−3 can be retained after 10 cycles at a C/10 cycling rate. We studied in particular the electrochemical mechanism during the first discharge of the FeSb2/Li battery. Both Mössbauer spectroscopy (57Fe and 121Sb) and in situ XRD studies show the formation of an unknown fcc-phase during the first step. A second step shows the conversion process leading to Li3Sb at the end of the discharge. The structure of the intermediate new phase Li4FeSb2 is isotype to the face-centered-cubic Li3Sb phase in which one Fe atom is substituted by two Li atoms.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
C. Villevieille, B. Fraisse, M. Womes, J.-C. Jumas, L. Monconduit,