One-step synthesis Nb2CTx MXene with excellent lithium-ion storage capacity

Abstract

Nb2CTx MXene have received extensive attention due to their unique properties. However, it has always been a challenge to prepare Nb2CTx with excellent electrochemical performance in one step. In this work, we focus on developing intrinsic properties of Nb2CTx and directly preparing Nb2CTx with excellent lithium-ion storage capacity. A simple method of treating Nb2AlC with a mixed solution of HCl and LiF has prepared Nb2CTx with large interlayer spacing, good surface group configuration and pre-intercalated Li+. The Li+ ion storage capacity of Li-Nb2CTx was evaluated, and showed superior performance. At 0.05 A g−1, the specific capacity of Li-Nb2CTx electrode is 425 mAh g−1, and it is almost unchanged during 1000 h of charging and discharging. At 1.00 A g−1, the specific capacity is stable at 321 mAh g−1 during 800 cycles. Using a simple method to reasonably develop the intrinsic properties of Nb2CTx can directly obtain Li-Nb2CTx with excellent electrochemical properties. This result further enhances the application prospects of Nb2CTx in Li+ ion storage devices.