Abstract Hollow spherical structures with abundant mesoporous are of great interest for electrode materials in lithium-ion batteries (LIBs). Although there are many synthetic strategies, using template-free methods to construct the hollow spherical structures still faces great challenges. Herein, we designed a simple template-free method to successfully obtain uniform hollow TiO2 microspheres (TiO2-H) with a well-defined hollow interior and abundant mesoporous. Owing to the structural superiority, the as-prepared TiO2-H as an electrode material for LIBs delivers a high specific capacity of ∼132 mAh g−1 at a current density of 2.0 C after 200 cycles. Besides, it also exhibits satisfying long-term cycling performances with a high specific capacity of ∼ 100 mAh g−1 at a large current density of 5.0 C after 800 cycles. These superior cycling performances and strong structure stability of TiO2-H electrodes are attributed to the hollow spherical structures with large specific surface areas and rich mesoporous, which can ensure Li ion diffusion and provide sufficient electrochemical reaction sites, as well as remit the large volume changes.

中文翻译：

---

用于长寿命和高容量锂存储的空心 TiO2 微球的无模板构建

摘要 具有丰富介孔的中空球形结构是锂离子电池（LIBs）电极材料的研究热点。尽管有很多合成策略，但使用无模板方法构建空心球形结构仍然面临巨大挑战。在这里，我们设计了一种简单的无模板方法，成功地获得了均匀的空心 TiO2 微球（TiO2-H），其内部具有明确的空心和丰富的介孔。由于结构优势，所制备的 TiO2-H 作为 LIB 的电极材料，在 200 次循环后，在 2.0 C 的电流密度下可提供 ~132 mAh g-1 的高比容量。此外，它还表现出令人满意的长期循环性能，在 800 次循环后在 5.0 C 的大电流密度下具有 ~ 100 mAh g-1 的高比容量。