One-step plasma electrolytic oxidation for TiO ₂ /SnO ₂ film as LIB anode

Abstract

In this work, a SnO 2 -doped TiO 2 film was rapidly prepared as lithium-ion battery anode by the one-step plasma electrolytic oxidation process on Ti foil. The whole process was carried out in an aqueous solution at room temperature and under atmospheric pressure without any heating or post-treatment. The prepared TiO 2 /SnO 2 composite film exhibited a porous structure with large amounts of channels and cavities, which served as the Li ions diffusion paths and surface active sites for the interfacial electrochemical reactions. The film took full advantage of the high structural stability of TiO 2 and a high theoretical capacity of SnO 2 , showing a high specific capacity (400 mAh g −1 at 100 μA cm −2 ), an excellent cycling stability (200 cycles), and a good rate capability (capacity reversible after 1000 μA cm −2 ). This work provides a low-cost and high-efficiency approach for the preparation of binder-free oxide anodes for high-performance LIBs.

Facile fabrication of TiO2/ZnO composite film anode by plasma electrolysis

“…Figure 2(a-c) show the surface features of the TiO 2 / ZnO composite films prepared by PEO. Obviously, unlike conventional anodic oxide film, the TiO 2 / ZnO composite film presents a rough surface with many channels, which should be ascribed to the breakdown and melting-solidifying effect of the destructive micro-arc plasma discharge [25,26]. The discharge mainly occurred in the interface region of the film/ matrix, and each sparking site corresponded to a discharge channel through the composite film.…”