In this study, Na₂Ti₆O₁₃ nanorods with large interlayer spacing (about 0.798 nm) were synthesized by the hydrothermal and solid-phase sintering methods, and applied to the anode of sodium ion batteries (SIBs). The influence of different calcination temperatures on the electrochemical properties of Na₂Ti₆O₁₃ nanorods were all studied. Benefitting from the nanorods structure and the large interlayer spacing, the Na₂Ti₆O₁₃ prepared at 800 °C possessed fast Na⁺ diffusion and achieved high discharge capacities of 168.2 and 115.2 mA h g⁻¹ at different current densities of 20 and 500 mA g⁻¹, respectively, and remained at 131.1 and 96.7 mA h g⁻¹ after 100 cycles, which exhibited the best cycling stability, fast Na⁺ diffusion characteristics, and excellent rate performance. Supported by electrochemical impedance spectroscopy, we found that the value of R_ct became larger and the D_Na⁺ became smaller with the progress of charge and discharge, which might be the cause of the decrease in the specific discharge capacity. The detailed analysis of cyclic voltammetry test confirmed that the proportion of pseudo-capacitance gradually decreased with the electrochemical reaction process keeping, from 83.8% at the beginning to 60.9% at the 100th cycle. This work establishes a valuable basis for the future study of Na₂Ti₆O₁₃ as outstanding anode material for SIBs.

本研究采用水热法和固相烧结法合成了具有大层间距（约0.798 nm）的Na ₂ Ti ₆ O ₁₃纳米棒，并将其应用于钠离子电池（SIBs）的负极。研究了不同煅烧温度对Na ₂ Ti ₆ O ₁₃纳米棒电化学性能的影响。得益于纳米棒结构和大的层间距，在 800 ℃制备的 Na ₂ Ti ₆ O _{13具有快速的 Na} ⁺扩散，并实现了 168.2 和 115.2 mAh g ^{-1的高放电容量}在20和500 mA g ^-1的不同电流密度下，循环100次后分别保持在131.1和96.7 mA h g ^-1，表现出最佳的循环稳定性、快速的Na ⁺扩散特性和优异的倍率性能。在电化学阻抗谱的支持下，我们发现R _ct值变大，D _Na ⁺随着充放电的进行而变小，这可能是比放电容量下降的原因。循环伏安测试的详细分析证实，随着电化学反应过程的保持，赝电容的比例逐渐下降，从开始时的83.8%下降到第100个循环时的60.9%。这项工作为未来研究 Na ₂ Ti ₆ O ₁₃作为 SIBs 的优秀负极材料奠定了宝贵的基础。