Zhao Jianan, Wang Xinyu, Xie Xinqi, Cao Hongmei
Department of Materials Science and Engineering, College of Transportation Engineering, Dalian Maritime University, Dalian, 116026, P.R. China.
School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212003 P.R. China.
Nanoscale. 2025 Apr 10;17(15):9315-9322. doi: 10.1039/d5nr00074b.
Aqueous manganese-ion batteries (MIBs) are considered a possible choice for energy storage systems as the Mn anode offers superior theoretical capacity and low redox potential. However, the capacities of the cathode materials are usually limited by the large radius of the solvated Mn. Herein, binder-free VO-carbon nanotube film (VO-CNT) cathodes were designed through a straightforward suction filtration method. In the films, VO with an open layered framework provided abundant ion transfer channels, and more importantly, the VO-CNT cathodes allowed the co-intercalation/extraction of Mn and H ions. This charge storage mechanism significantly optimized the electrochemical performance of the batteries. In addition, the carbon nanotubes formed a continuous high-conductive scaffold in the film, which contributed to the overall good conductivity of the cathode. Leveraging the synergistic advantages of VO and carbon nanotubes, the binder-free VO-CNT cathodes displayed a high capacity, an exceptional rate capability, and robust cycling stability, retaining 96% capacity over 1000 cycles. This work provides a novel method in the design of high-performance cathodes for aqueous MIBs.
水系锰离子电池（MIBs）被认为是储能系统的一种可能选择，因为锰阳极具有优异的理论容量和低氧化还原电位。然而，阴极材料的容量通常受到溶剂化锰离子较大半径的限制。在此，通过一种简单的吸滤方法设计了无粘结剂的VO-碳纳米管薄膜（VO-CNT）阴极。在这些薄膜中，具有开放层状结构的VO提供了丰富的离子传输通道，更重要的是，VO-CNT阴极允许锰离子和氢离子的共嵌入/脱出。这种电荷存储机制显著优化了电池的电化学性能。此外，碳纳米管在薄膜中形成了连续的高导电支架，这有助于阴极整体良好的导电性。利用VO和碳纳米管的协同优势，无粘结剂的VO-CNT阴极表现出高容量、出色的倍率性能和强大的循环稳定性，在1000次循环后仍保留96%的容量。这项工作为水系MIBs高性能阴极的设计提供了一种新方法。
