Wang Cheng-Cheng, Zhang Lu-Lu, Fu Xin-Yuan, Sun Hua-Bin, Yang Xue-Lin
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy, China Three Gorges University, Yichang, Hubei 443002, China.
College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China.
ACS Appl Mater Interfaces. 2024 Apr 17;16(15):18959-18970. doi: 10.1021/acsami.4c01638. Epub 2024 Apr 3.
Fe-based Prussian blue (Fe-PB) analogues have emerged as promising cathode materials for sodium-ion batteries, owing to their cost-effectiveness, high theoretical capacity, and environmental friendliness. However, their practical application is hindered by [Fe(CN)] defects, negatively impacting capacity and cycle stability. This work reports a hollow layered Fe-PB composite material using 1,3,5-benzenetricarboxylic acid (BTA) as a chelating and etching agent by the hydrothermal method. Compared to benzoic acid, our approach significantly reduces defects and enhances the yield of Fe-PB. Notably, the hollow layered structure shortens the diffusion path of sodium ions, enhances the activity of low-spin Fe in the Fe-PB lattice, and mitigates volume changes during Na-ion insertion/extraction into/from Fe-PB. As a sodium-ion battery cathode, this hollow layered Fe-PB exhibits an impressive initial capacity of 95.9 mAh g at a high current density of 1 A g. Even after 500 cycles, it still maintains a considerable discharge capacity of 73.1 mAh g, showing a significantly lower capacity decay rate (0.048%) compared to the control sample (0.089%). Moreover, the full cell with BTA-PB-1.6 as the cathode and HC as the anode provides a considerable energy density of 312.2 Wh kg at a power density of 291.0 W kg. This research not only enhances the Na storage performance of Fe-PB but also increases the yield of products obtained by hydrothermal methods, providing some technical reference for the production of PB materials using the low-yield hydrothermal method.
铁基普鲁士蓝（Fe-PB）类似物因其成本效益高、理论容量高和环境友好性，已成为钠离子电池有前景的阴极材料。然而，它们的实际应用受到[Fe(CN)]缺陷的阻碍，对容量和循环稳定性产生负面影响。这项工作报道了一种通过水热法使用1,3,5-苯三甲酸（BTA）作为螯合和蚀刻剂的中空层状Fe-PB复合材料。与苯甲酸相比，我们的方法显著减少了缺陷并提高了Fe-PB的产率。值得注意的是，中空层状结构缩短了钠离子的扩散路径，增强了Fe-PB晶格中低自旋Fe的活性，并减轻了钠离子插入/脱出Fe-PB过程中的体积变化。作为钠离子电池的阴极，这种中空层状Fe-PB在1 A g的高电流密度下表现出令人印象深刻的初始容量95.9 mAh g。即使经过500次循环，它仍保持相当可观的73.1 mAh g的放电容量，与对照样品（0.089%）相比，容量衰减率显著更低（0.048%）。此外，以BTA-PB-1.6作为阴极和HC作为阳极的全电池在291.0 W kg的功率密度下提供了312.2 Wh kg的可观能量密度。这项研究不仅提高了Fe-PB的储钠性能，还提高了水热法获得的产物的产率，为使用低产率水热法生产PB材料提供了一些技术参考。
