The critical challenge of TiSe₂ anode for lithium-ion battery (LIB) lies in the severe polarization due to the accumulation of excessive lithium ions and Li₃TiSe₂ phase during charge/discharge process, resulting in reduced active sites and sluggish interfacial transport kinetics. To solve the issues, Sb doped TiSe₂@C core–shell is synthesized via a combined ion etching-doping route. During the process, the introduced Sb element in MIL-125 triggers a synergistic etching-ion exchanging reaction, leading to a structure change of TiSe₂ from bulk to core–shell as well as homogeneous Sb-doping in TiSe₂. The unique structure demonstrates nano-crystallization of bulk TiSe₂ and the formation of local built-in electric field, providing enough achievable active sites and enhancing interfacial charge/ion transfer kinetics. Benefitting from the synergistic effect of structural engineering and electronic structural engineering, polarization effect is weakened and pseudocapacitance storage ability is improved, leading to the high specific capacity and cycle stability of 502 mAh g⁻¹ after 100 cycles at 0.1 A g⁻¹. Therefore, the synthetic route of Sb doped TiSe₂@C core–shell anode can be extended to related nanostructured systems for high performance energy storage device application.

锂离子电池（LIB）TiSe ₂负极的关键挑战在于充放电过程中过量锂离子和Li ₃ TiSe ₂相的积累导致严重的极化，导致活性位点减少和界面传输动力学缓慢. 为了解决这些问题，Sb 掺杂的 TiSe ₂ @C 核壳通过组合的离子蚀刻-掺杂路线合成。在此过程中，MIL-125 中引入的 Sb 元素触发了协同蚀刻-离子交换反应，导致 TiSe _{2的结构从块体转变为核壳结构，并在 TiSe 2}中均匀掺杂 Sb 。_{独特的结构展示了块状 TiSe 2}的纳米结晶以及局部内建电场的形成，提供足够的可实现的活性位点并增强界面电荷/离子转移动力学。受益于结构工程和电子结构工程的协同效应，极化效应减弱，赝电容存储能力提高，从而在0.1 A g ^-1下循环100次后具有502 mAh g ^-1的高比容量和循环稳定性。因此，Sb 掺杂的 TiSe ₂ @C 核壳阳极的合成路线可以扩展到相关的纳米结构系统，用于高性能储能器件应用。