A TiO 2 /ZnO composite film which served as the bind-free anode for lithium-ion battery was rapidly constructed on Ti foil by the one-step plasma electrolytic oxidation process. The fabricated TiO 2 -based transition metal oxide composites took advantage of the high theoretical capacity of ZnO and the good structural stability of TiO 2 , showing a high specific capacity (706.2 mAh g −1 over 400 cycles at 0.1 A g −1 ) and a good rate capability (capacity reversible after 2.0 A g −1 ). When the scan rate gradually elevated from 0.2 to 1.0 mV s −1 , the pseudocapacitance contribution increased from 63.9% to 81.2%. Besides, the holecontaining morphology of the film guaranteed efficient diffusion and excellent dynamic characteristics for Li + . The whole film preparation process was accompanied by a facile inliquid plasma discharge with an average electron temperature of 3519 K. This high-efficiency and low-cost approach extends the practical territory of transition metal oxide anodes.

Herein, we report a robust and efficient approach to build a MXene embedded TiO2 composite thin film in situ on Ti foil via the plasma discharge process in aqueous solution. The plasma electron temperature fluctuates from 4000 K of the initial discharge to 6000 K of the stable discharge, accompanied by frequency variation of the acoustic signal. The fabricated composite film presents a porous morphology with 3D skeletal TiO2/MXene and uniformly distributed SiO2 nano-particles, which guarantees the superior Li storage performance when serves as the Li-ion battery anode. Its specific capacity can stabilize above 2300 mAh g−1 at the current density of 0.1 A g−1, together with an excellent rate capability. This work provides a promising route for the one-step synthesis of binder-free oxide anodes without the anfractuous pretreatments or post-treatments.

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