Lithium‐ion batteries (LIBs) have been widely applied and studied as an effective energy supplement for a variety of electronic devices. Titanium dioxide (TiO₂), with a high theoretical capacity (335 mAh g⁻¹) and low volume expansion ratio upon lithiation, has been considered as one of the most promising anode materials for LIBs. However, the application of TiO₂ is hindered by its low electrical conductivity and slow ionic diffusion rate. Herein, a 2D ultrathin mesoporous TiO₂/reduced graphene (rGO) heterostructure is fabricated via a layer‐by‐layer assembly process. The synergistic effect of ultrathin mesoporous TiO₂ and the rGO nanosheets significantly enhances the ionic diffusion and electron conductivity of the composite. The introduced 2D mesoporous heterostructure delivers a significantly improved capacity of 350 mAh g⁻¹ at a current density of 200 mA g⁻¹ and excellent cycling stability, with a capacity of 245 mAh g⁻¹ maintained over 1000 cycles at a high current density of 1 A g⁻¹. The in situ transmission electron microscopy analysis indicates that the volume of the as‐prepared 2D heterostructures changes slightly upon the insertion and extraction of Li⁺, thus contributing to the enhanced long‐cycle performance.

中文翻译：

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用于高性能锂存储的超薄二维中孔TiO2 / rGO异质结构。

锂离子电池（LIB）已被广泛应用并作为各种电子设备的有效能量补充进行了研究。具有高理论容量（335 mAh g ^-1）和低锂化时体积膨胀率的二氧化钛（TiO ₂）被认为是锂离子电池最有希望的阳极材料之一。然而，TiO ₂的应用由于其低电导率和缓慢的离子扩散速率而受到阻碍。在此，通过逐层组装工艺制备了二维超薄介孔TiO ₂ /还原石墨烯（rGO）异质结构。超薄介孔TiO ₂的协同作用rGO纳米片显着增强了复合材料的离子扩散和电子传导性。引入的2D介孔异质结构在200 mA g ^-1的电流密度下可显着提高350 mAh g ^-1的容量，并具有出色的循环稳定性，在高电流密度下可在1000次循环中维持245 mAh g ^-1的容量。 1 A g ^-1。原位透射电子显微镜分析表明，所制备的2D异质结构的体积随Li ⁺的插入和提取而略有变化，从而有助于提高长循环性能。