ABSTRACT

In this work, a SnO₂-doped TiO₂ 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 TiO₂/SnO₂ 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 TiO₂ and a high theoretical capacity of SnO₂, 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.

摘要

在这项工作中，通过一步等离子体电解氧化工艺在钛箔上快速制备了 SnO ₂掺杂的 TiO ₂薄膜作为锂离子电池负极。整个过程在室温和大气压下在水溶液中进行，没有任何加热或后处理。制备的TiO ₂ /SnO ₂复合膜具有多孔结构，具有大量通道和空腔，作为界面电化学反应的Li离子扩散路径和表面活性位点。该薄膜充分利用了TiO ₂的高结构稳定性和SnO ₂的高理论容量，表现出高比容量（400 mAh g^-1 at 100 μA cm ^-2）、优异的循环稳定性（200 次循环）和良好的倍率性能（容量在 1000 μA cm ^-2后可逆）。这项工作为制备用于高性能锂离子电池的无粘合剂氧化物负极提供了一种低成本、高效率的方法。