Facile synthesis of flower-like T-Nb2O5 nanostructures as anode materials for lithium-ion battery

Abstract

As a model quasi-2D network intercalation electrodes, niobium pentoxide (Nb2O5) has gained numerous attention in electrochemical materials because of its structural stability and high safety. Nevertheless, Nb2O5 exhibits the inherent low conductivity of transition metal oxides, which limits the rate of ionic diffusion and charge transfer. To overcome the drawbacks, the nanoscale Nb2O5 can be synthesized to improve electrochemical performance. Here, we prepared the flower-like orthorhombic Nb2O5 (i.e., T-Nb2O5) nanostructures to evaluate the effect of Nb2O5 nanoparticle morphology associated with crystallinity for lithium-ion batteries (LIBs) anode. T-Nb2O5-2 displays superior crystallinity, pore structure, capacity, reversibility, and cycling stability. Specifically, T-Nb2O5-2 exhibits the initial charge/discharge capacity of 289 and 525 mAh g−1 at 0.1 C, and after 100 cycles, the capacity is 178.2 mAh g−1 at 1 C when the solvothermal time is 16 h. This study shows that Nb2O5 with good crystallinity can slow down the volume expansion and structural deformation generated during the intercalation–deintercalation of Li-ions. We believe that the specified Nb2O5 presented in this work has great potential as a promising candidate for high-performance LIB anodes.