Key points are not available for this paper at this time.
The electrochemical reaction of lithium with the metal phosphide is reported. Li uptake in this material was investigated using electrochemical studies combined with X-ray diffraction, X-ray absorption spectroscopy, and magnetic measurements. The uptake of six Li during the first discharge leads to a specific capacity of 1365 mAh/g, and an amorphous phase retaining substantial Fe-P bonding that displays superparamagnetic behavior and an extremely low transition temperature. Upon charge, 5.5 lithium can be extracted from this metastable ternary "Li-Fe-P" phase, leading to a reversible capacity of 1250 mAh/g. The low (ca. 10-15%) irreversibility exhibited by makes it an interesting candidate in the search for new negative electrode materials. © 2003 The Electrochemical Society. All rights reserved.
Silva et al. (Wed,) studied this question.