NbSe 3 nanobelts wrapped by reduced graphene oxide for lithium ion battery with enhanced electrochemical performance

Abstract Recently, layered transition metal chalcogenides (LTMCs) have attracted great attention as anode materials for lithium ion batteries (LIBs). However, the volume expansion and structure instability of LTMCs during the lithiation and delithiation process still remains challenging. Herein, we report NbSe3 nanobelts wrapped by reduced-graphene oxide (NbSe3@rGO) utilized as buffer layers with enhanced electrochemical performance. The X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy were used to probe features of the NbSe3@rGO. The NbSe3@rGO nanobelts as anode exhibit a discharge capacity of 300 mAh/g at the current density of 100 mAh/g after 250 cycles, several times higher than pure NbSe3 nanobelts. The improved electrochemical performance of NbSe3@rGO is attributed to a buffer effect from the rGO, cushioning the volume-change-induced strain effect on the structure of NbSe3 nanobelts during cycling.