H2O2 assisted hydrothermal oxidation of partially etched vanadium carbides (MXene) and their electrochemical properties as anode for Li-ion batteries

The novel V 2 CT x MXenes have gained increasing attention as anode materials in lithium-ion batteries, but to boost their practical to the theoretical values is still challenging. Herein, the partially etched V 2 CT x was oxidized in the presence of H 2 O 2 through a hydrothermal reaction and the electrochemical properties of as-obtained oxidized V 2 CT x were assessed. It is illustrated that the oxidized V 2 CT x possesses a large surface interlayer spacing, and enriched with VO 2 (A) and O-terminate groups. Once used as anode materials for Li-ion batteries, the oxidized V 2 CT x shows enhanced specific lithium ion storage capacities of 318 mAh·g −1 at 100 mA·g −1 after 100 cycles, and 125 mAh·g −1 at 1000 mA·g −1 after 1000 cycles, and better cycling stability and excellent rate performance over the V 2 CT x .