Li-ion uptake and increase in interlayer spacing of Nb4C3 MXene

Nb4C3Tx MXene, is formed by etching Al from Nb4AlC3 in HF at room temperature. As anode for lithium ion batteries, it displays a higher capacity than as-produced titanium carbide MXenes, and the charge/discharge capacity of the Nb4C3Tx anode increases with cycling. The mechanisms of its excellent rate capability and superior long-term stability at the ultrahigh rate have been studied and explained.196