TiO₂ is considered as a potential anode with the advantages of stable structure and high safety. However, the large-scale application of TiO₂ is restricted due to its low electronic conductivity and sluggish Na⁺ diffusion. In the present work, anatase and TiO₂-B dual-phase TiO₂ hollow microspheres (TiO₂-MS) were designed through a universal hydrothermal reaction. These microspheres were composed of nanosheets, and the nanosheets were consisted of small nanoparticles. Benefitting from the synergistic effect of dual-phase TiO₂ nanoparticles and hierarchical structure, the TiO₂-MS can not only buffer the volume changes during Na⁺ intercalation/deintercalation process, but also provide the contact space for electrolyte − electrode. As a result, the TiO₂-MS anode delivered a distinguished sodium storage performance, maintained 240 mA h g⁻¹ at 2C (1C = 168 mA g⁻¹) after 150 cycles. Even the current density was increased to 20C, a capacity of 159.7 mA h g⁻¹can still be maintained after 5000 cycles.

TiO ₂被认为是一种潜在的阳极，具有结构稳定、安全性高等优点。然而，TiO _{2 的}电导率低，Na ⁺扩散缓慢，限制了其大规模应用。在目前的工作中，锐钛矿和TiO ₂ -B 双相TiO ₂空心微球（TiO ₂ -MS）是通过通用水热反应设计的。这些微球由纳米片组成，而纳米片由小纳米颗粒组成。受益于双相 TiO ₂纳米粒子和分级结构的协同作用，TiO ₂ -MS 不仅可以缓冲 Na 过程中的体积变化⁺嵌入/脱嵌过程，但也为电解质 - 电极提供接触空间。结果，TiO ₂ -MS 阳极提供了卓越的钠存储性能，在 150 次循环后在 2C (1C = 168 mA g ^-1 ) 下保持了 240 mA h g ^-1。即使电流密度增加到20C，5000次循环后仍可保持159.7 mAh g ^-1的容量。