Fabricating high-performance anode materials is of great significance for the realization of advanced Na-ion batteries (SIBs). Poor rate capability and insufficient cycle stability are two main scientific issues urgently needing to be solved for sodium titanate (Na_xTi_yO_z) anodes. In this paper, protonated titanate nanowire arrays are designed rationally as novel additive-free anodes for SIBs. Results reveal that the protonated strategy can controllablly regulate the lattice interlayer spacing of the titanate, which can not only effectively facilitate the Na-ion migration but also suppress the side reaction and inhibit the irreversible trapping of Na-ions in the crystal framework, leading to fast Na-ion diffusion kinetics. Moreover, the protonated titanate material experiences smaller changes in lattice parameters and unit-cell volume during long-term cycling than those of non-protonated material, resulting in less mechanical stresses and capacity loss in an anode. As expected, the protonated titanate material exhibits superior rate performance and ultralong lifespan when utilized as free-standing anode for SIB, remaining 85% capacity retention after 8000 cycles at 5.0 A g⁻¹ (~ 23 C). When assembled as full cell with Na₃V₂(PO₄)₃ cathode, high energy density (262.3 Wh kg⁻¹) and power density (1748.9 W kg⁻¹), excellent rate capability and superior cycle stability (260 cycles, 86%) can be achieved.

制备高性能阳极材料对于实现高级钠离子电池（SIB）具有重要意义。速率能力差和循环稳定性不足是钛酸钠（Na _x Ti _y O _z）阳极。在本文中，将质子化的钛酸盐纳米线阵列合理地设计为用于SIB的新型无添加剂阳极。结果表明，质子化策略可以可控地调节钛酸酯的晶格层间距，不仅可以有效地促进钠离子的迁移，而且可以抑制副反应并抑制钠离子在晶体构架中的不可逆俘获，从而快速的Na离子扩散动力学。而且，质子化的钛酸盐材料在长期循环中与非质子化的材料相比，晶格参数和晶胞体积的变化较小，从而导致阳极的机械应力和容量损失较小。不出所料，当质子化钛酸酯材料用作SIB的独立式阳极时，具有优异的倍率性能和超长的使用寿命，^-1（〜23 C）。当组装成具有Na ₃ V ₂（PO ₄）₃阴极的全电池时，具有高能量密度（262.3 Wh kg ^-1）和功率密度（1748.9 W kg ^-1），出色的速率能力和出色的循环稳定性（260个循环，86个） ％） 可以实现。