MXene has shown distinctive advantages as anode materials of lithium-ion batteries.However,local surface chemistry,which was confirmed that can block ion transfer and limit redox reaction,has a significant effect on electrochemical performance.Herein,annealing MXene under hydrogen was employed for removing-F and turning-OH to-O terminations.We demonstrate that it improves the kinetics of Li-ion transport between the electrolyte and electrode.As a result,a lower interfacial charge transfer impedance was obtained.The electrochemical measurement exhibited that a nearly 2-fold increase of specific capacity was achieved for the annealed MXene.