Great efforts, such as nano-structuring and carbon coating, have been devoted to addressing the poor rate performance of TiO₂ anodes in lithium ion batteries, which is mainly caused by sluggish Li ion diffusion and poor electrical conductivity of the bulk material. However, the complicated fabrication processes make most of these strategies much low practical significance. Herein, a scalable and facile strategy based on sacrificial template-accelerated hydrolysis and polydopamine coating is proposed to manufacture uniform N-doped carbon-coated TiO₂ hollow spheres. The nanostructured hollow structure can shorten the path of Li⁺ insertion/extraction in the electrode material. More importantly, the uniform carbon layer can improve the electronic conductivity of TiO₂ during long-term cycling. Thus, a reversible capacity can be obtained of as high as 390.2 mA h g⁻¹ at a current density of 0.1 A g⁻¹. Furthermore, a high capacity of 166.3 mA h g⁻¹ after 2000 cycles at 5.0 A g⁻¹ shows that the carbon-coated TiO₂ hollow spheres deliver good capacity retention and cycling performance.

中文翻译：

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方便的合成均匀的N掺杂的碳包覆的TiO2空心球，具有增强的锂存储性能

为了解决锂离子电池中TiO ₂阳极不良的倍率性能，这主要是由纳米结构和碳涂层等方面的巨大努力解决的，这主要是由于锂离子扩散缓慢和块状材料的导电性差所致。但是，复杂的制造工艺使大多数这些策略的实用价值大大降低。在此，提出了一种基于牺牲模板加速水解和聚多巴胺涂层的可扩展且简便的策略，以制造均匀的N掺杂碳包覆的TiO ₂中空球。纳米结构的空心结构可以缩短Li ⁺的路径在电极材料中的插入/提取。更重要的是，均匀的碳层可以改善长期循环过程中TiO ₂的电子传导性。因此，能够的获得可逆容量高达390.2毫安汞柱^-1在0.1 A g的电流密度^-1。此外，在5.0 A g ^-1的2000次循环后，高容量为166.3 mA hg ^-1，表明碳包覆的TiO ₂中空球具有良好的容量保持性和循环性能。