Reversible Lithium Uptake by FeP2

摘要: The electrochemical reaction of lithium with the metal phosphide FeP 2 is reported. Li uptake in this material was investigated using studies combined X-ray diffraction, absorption spectroscopy,and magnetic measurements. six during first discharge leads to a specific capacity 1365 mAh/g, and an amorphous phase retaining substantial Fe-P bonding that displays superparamagnetic behavior extremely low transition temperature. Upon charge, 5.5 can be extracted from metastable ternary "Li-Fe-P" phase, leading reversible 1250 mAh/g. (ca. 10-15%) irreversibility exhibited by makes it interesting candidate search for new negative electrode materials.