Titanium-based polyanionic compounds have gained wide attentions as anode materials for room-temperature sodium-ion batteries due to the robust structural framework, reversible redox chemistry, and compositional diversities. However, the effect of chemically-inserted cations on their structural and electrochemical properties is lack of being investigated to date. In this work, structural and electrochemical properties of ATi₂(PO₄)₃/C (A = Li, Na, Mg) compounds are comparatively studied by coupling X-ray diffraction, scanning electron microscope, cyclic voltammetry and galvanostatic measurements. Experimental results reveal that the structural composition is an important factor determining electrochemical properties of titanium-based polyanionic compounds, and the Li-containing composition shows the best charge/discharge performance with high specific capacities of 120.4 mAh g⁻¹ at 20 mA g⁻¹ and 89.7 mAh g⁻¹ at 1000 mA g⁻¹, and outstanding cycling stability without capacity fading after 1000 cycles. In particular, full battery assembled with it and Na₃V₂(PO₄)₃ cathode can deliver a specific energy of 124.5 Wh kg⁻¹ at the power of 114.9 W kg⁻¹, and a capacity retention of 84.9% after 100 cycles.

钛基聚阴离子化合物由于其坚固的结构框架，可逆的氧化还原化学性质和组成多样性而作为室温钠离子电池的负极材料受到了广泛的关注。然而，迄今为止，尚未研究化学插入的阳离子对其结构和电化学性质的影响。在这项工作中，ATi ₂（PO ₄）_3的结构和电化学性质通过耦合X射线衍射，扫描电子显微镜，循环伏安法和恒电流测量，对/ C（A = Li，Na，Mg）化合物进行了比较研究。实验结果表明，结构组成是决定钛基聚阴离子化合物电化学性能的重要因素，并且含锂的组合物在20 mA g ^{- 1下}具有120.4 mAh g ^{- 1的}高比容量，表现出最佳的充电/放电性能。和89.7毫安克^{- 1}以1000mA克^{- 1}，和没有容量1000次循环后衰落优秀的循环稳定性。特别是将完整的电池与Na ₃ V ₂（PO₄）₃阴极可以提供的124.5瓦kg的比能量^{- 1}在114.9W¯¯公斤功率^{- 1}，和100次循环后的84.9％的容量保持率。