Yu Wenjing, Wang Kunfang, Xu Ruiling, Wu Mingzhe, Liu Chang, Su Xin
Advanced Battery Technology Center, Harbin Institute of Technology, Weihai 264209, China.
School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China.
ACS Appl Mater Interfaces. 2025 Feb 5;17(5):7870-7880. doi: 10.1021/acsami.4c20346. Epub 2025 Jan 24.
Prussian blue analogs (PBAs) as cathode material for sodium-ion batteries have attracted widespread attention due to their affordability, simple synthesis, and high theoretical capacity. Nevertheless, the oxidation of Fe and sodium loss lead to poor electrochemical properties which restrict the practical use of PBAs. Herein, a simple coprecipitation approach based on sodium salt-reduction-assisted synthesis was proposed to construct high-sodium PBAs. The sodium bisulfite (NaHSO) not only effectively inhibits the oxidation of Fe but also increases the mole ratio of Na in the resulting products. The optimized sample exhibits excellent specific capacity (131.1 mAh g at 0.1C), high rate performance (103.9 mAh g at 10C), and good cyclic performance (94.8% capacity retention after 200 cycles). Experimental results reveal that the sample synthesized with sodium bisulfite possesses improved sodium-ion diffusion kinetics and stable crystal structure. In this study, a scalable method is introduced for the synthesis of PBAs with excellent electrochemical properties and further applications.
普鲁士蓝类似物（PBAs）作为钠离子电池的阴极材料，因其价格低廉、合成简单和理论容量高而受到广泛关注。然而，铁的氧化和钠的流失导致其电化学性能较差，这限制了PBAs的实际应用。在此，提出了一种基于钠盐还原辅助合成的简单共沉淀方法来制备高钠PBAs。亚硫酸氢钠（NaHSO）不仅能有效抑制铁的氧化，还能提高所得产物中钠的摩尔比。优化后的样品表现出优异的比容量（0.1C时为131.1 mAh g）、高倍率性能（10C时为103.9 mAh g）和良好的循环性能（200次循环后容量保持率为94.8%）。实验结果表明，用亚硫酸氢钠合成的样品具有改善的钠离子扩散动力学和稳定的晶体结构。本研究介绍了一种可扩展的方法，用于合成具有优异电化学性能的PBAs及其进一步应用。
