An exfoliated vanadium pentoxide nanoplatelet and its electrochemical properties for lithium-ion batteries

摘要

A novel vanadium pentoxide (V2O5) nanoplatelet has been prepared by an oxalic acid assisted solgel method using β-cyclodextrin as an exfoliation agent followed by sintering at a high temperature. Crystal structure and morphology are analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Due to about 10 nm thick, the product shows a large chemical diffusion coefficient of Li+ ions over 10 -10 cm2 s-1 at room temperature. In the potential range of 4.02.0 V (vs. Li/Li+), it can deliver an initial capacity of 291 mAh g-1 at 0.1 C rate, which equals approximately to the theoretic one. It also shows excellent rate ability and good cycling performance at room temperature. The primary results suggest this two-dimensional nanomaterial could be developed into a promising cathode material for lithium-ion batteries.

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