Amorphous P2S5/C Composite as High-Performance Anode Materials for Sodium-Ion Batteries.

We show a general method for achieving high-performance sodium storage materials via transforming crystalline P2S5 to amorphous P2S5 adhered to carbon matrix. The amorphous P2S5/C composite shows unique structural characteristics differing from the crystalline, which is identified by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscope (TEM) and so on. The amorphous P2S5/C composite exhibits a safe average potential of 0.82 V, a reversible capacity of 400 mA h g-1, a remarkable capacity retention of 89.4% over 4000 cycles as well as good rate capability. Our findings open up opportunities to design of advanced anodes for room-temperature sodium-ion batteries.