TiO 2 Nanoparticles In Situ Formed on Ti 3 C 2 Nanosheets by a One‐Step Ethanol‐Thermal Method for Enhanced Reversible Lithium‐Ion Storage

MXenes, a family of two‐dimensional (2D) carbides, nitrides and carbonitrides, have been considered as promising anode materials for lithium‐ion (Li + ) batteries due to their good flexibility and conductivity. Herein, we report a one‐step ethanol‐thermal method to form titanium dioxide (TiO 2 ) nanoparticles on the surface of Ti 3 C 2 nanosheets with less oxidation and high 2D structural integrity, and meanwhile investigate the properties of reversible Li + storage. It indicates that a reversible specific capacity of 257.3 mAh g −1 at the current density of 50 mA g −1 can be delivered. Moreover, the specific capacity of 141.4 mAh g −1 with the coulombic efficiency of ∼100 % can be obtained even after 250 cycles at the current density as high as 1 A g −1 . The improved capacity can be attributed to the synergetic effect that prevents stacking of the Ti 3 C 2 nanosheets by the surface‐anchored TiO 2 nanoparticles and meanwhile avoids agglomerating of TiO 2 nanoparticles due to the existence of Ti 3 C 2 nanosheets.