The ultrathin TiO₂ nanosheets doped by nitrogen tightly attaching on carbon nanotubes are designed and evaluated as anode for sodium ion batteries. The TiO₂ nanosheets attaching on carbon nanotubes composite shows a high specific capacity of 248.5 mAh g⁻¹ at the rate of 0.5 C, and it can still deliver a specific capacity of 100.9 mAh g⁻¹ at a high rate of 20 C, which verifies an outstanding sodium storage capacity and an excellent rate capability. More encouragingly, at a rate of 10 C, the specific capacity can be still kept at 154.2 mAh g⁻¹ after 3500 cycles, displaying a remarkable long-term cyclic stability. Note that the corresponding kinetics analysis suggests that the pseudocapacitive behaviour is responsible for the updating sodium storage performances of TiO₂ nanosheets composite. Additionally, the cooperation effects of carbon nanotubes preservation and nitrogen modification can provide fast electronic pathways, and the TiO₂ nanosheets can promote sodium ions transport and increase the active sites for sodium storage. The merits of multiple functional and tailor-designed strategies make contributions to develop high-performance TiO₂ anodes in sodium ion batteries.

设计并评价了氮紧密附着在碳纳米管上的超薄TiO ₂纳米片，并作为钠离子电池的负极进行了评估。附着在碳纳米管复合材料上的TiO ₂纳米片在0.5 C的速率下显示出248.5 mAh g ^-1的高比容量，在20 C的高速率下仍可提供100.9 mAh g ^-1的比容量。验证了出色的钠存储容量和出色的速率处理能力。更令人鼓舞的是，在10 C的速率下，比容量仍可保持在154.2 mAh g ^-1经过3500次循环后，显示出显着的长期循环稳定性。注意，相应的动力学分析表明，拟电容行为是导致TiO ₂纳米片复合材料钠存储性能更新的原因。此外，碳纳米管保存和氮改性的协同作用可以提供快速的电子途径，而TiO ₂纳米片可以促进钠离子的转运并增加钠存储的活性位。多种功能和量身定制的策略的优点为开发钠离子电池中的高性能TiO ₂阳极做出了贡献。