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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 hole-containing morphology of the film guaranteed efficient diffusion and excellent dynamic characteristics for Li  +  . The whole film preparation process was accompanied by a facile in-liquid 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.

Facile fabrication of TiO 2 /ZnO composite film anode by plasma electrolysis