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针对Na_2Ti_3O7本征电导率低及钠离子扩散动力学缓慢等问题，通过pH值调控的液相-喷雾干燥法成功制得了不同微观结构的Na_2Ti_3O7负极材料，并分析不同pH值条件下其形貌结构和电化学性能的变化。结果表明：在pH=6条件下获得的样品(NTO-6)因同时具备“高堆积有序度的微球形貌”与“最大的层间距(0.85778 nm)”这一协同结构而展现出最优异的储钠性能；致密的微球结构有效维持了电极在长循环中的完整性，而扩大的层间距则为钠离子提供了更畅通的扩散通道，从而直接促使该材料在2.0 C高倍率下实现93.4 mA·h/g的高容量，并在1.0 C下循环200圈后仍能保持86.4%的容量；NTO-6具有最高的表面电容贡献((b值=0.49)与最小的电荷转移阻抗，这与其独特的微观结构特征高度一致；基于pH值进行精确调控可优化材料的微观结构与晶格参数，是提升Na_2Ti_3O7负极动力学性能与长期稳定性的关键。
Abstract：To address the issues of low intrinsic electrical conductivity and sluggish Na+ diffusion kinetics in Na_2Ti_3O7, Na_2Ti_3O7 anode materials with various microstructures were successfully synthesized via a pH-regulated liquid phase-spray drying method. The evolution of morphology, structure and electrochemical performance under different pH values was systematically investigated. The results demonstrate that the sample obtained at pH=6(NTO-6) exhibits the most superior sodium storage performance, benefiting from the synergistic effect of highly packed and ordered microspherical morphology and the largest interlayer spacing of 0.85778 nm. The dense microsphere structure effectively maintains the electrode integrity during longterm cycling, while the expanded interlayer spacing provides more accessible diffusion pathways for sodium ions, contributing to a high reversible capacity of 93.4 mA·h/g at 2.0 C and a capacity retention of 86.4 % after 200 cycles at 1.0 C. NTO-6 delivers the highest surface capacitive contribution(b-value = 0.49) and the lowest charge-transfer resistance, which is highly consistent with its unique microstructure. Precise regulation based on pH value can optimize the microstructure and lattice parameters of the material, which is the key to enhancing the kinetic properties and long-term cycling stability of Na_2Ti_3O7 anodes.
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基本信息:
中图分类号:TQ131.12;TM912
引用信息:
[1]田琦峰,杨文静,胡炜,等.基于pH调控的Na_2Ti_3O_7形貌及其储钠机制分析[J].天津工业大学学报().
基金信息:
国家自然科学基金项目（51474160）; 湖北省三峡实验室开放创新基金项目（SC240009）
2026-04-13
2026-04-13
2026-04-13