TiO₂ has been considered as a promising anode material for lithium-ion batteries (LIBs) due to its low cost and high stability, but its low conductivity has greatly limited its application. In this study, the nitrogen-doped TiO₂ (N-TiO₂) with a uniform carbon coating was prepared by the solvothermal method. According the XPS results, the nitrogen was successfully doped in the TiO₂. The N-doped TiO₂ electrode exhibited obviously higher lithium-ion storage performance, of which the discharge capacity was 420 mAh g⁻¹ under the current density 0.1 A g⁻¹. Additionally, the superior long-term cycling stability was also observed with a reversible capacity of 148 mAh g⁻¹ after 3000 cycles under 3 A g⁻¹ current density. The result showed that after the nitrogen doped, the replacing of lattice oxygen with nitrogen can decrease the band-gap width and improve the conductivity of titanium oxide. Meanwhile, the oxygen vacancies on the surface of the material can adsorb a large number of lithium ions and produce significant pseudo-capacitance, thus, effectively increasing the specific capacity of the material. Therefore, the N-doped TiO₂ electrode can present obviously higher lithium-ion storage performance.

TiO ₂因其低成本和高稳定性而被认为是一种很有前途的锂离子电池（LIBs）负极材料，但其低电导率极大地限制了其应用。在本研究中，采用溶剂热法制备了具有均匀碳涂层的氮掺杂 TiO ₂ (N-TiO ₂ )。根据XPS 结果，氮成功地掺杂在TiO _{2 中}。n型掺杂的TiO ₂电极表现出明显更高的锂离子存储性能，其中的放电容量为420毫安时的克^-1的电流密度下0.1 A克^-1. 此外，还观察到优异的长期循环稳定性，在 3 A g ^-1电流密度下循环 3000 次后，可逆容量为 148 mAh g ^-1。结果表明，氮掺杂后，用氮取代晶格氧可以减小带隙宽度，提高氧化钛的导电性。同时，材料表面的氧空位可以吸附大量锂离子，产生显着的赝电容，从而有效提高材料的比容量。因此，N掺杂的TiO ₂电极可以表现出明显更高的锂离子存储性能。