Liu Xianyu, Zhao Jianan, Fan Zhigang, Xiao Yingchun, Zhao Yande, Guo Qing
Bailie School of Petroleum Engineering, Lanzhou City University Lanzhou 730070 China
Department of Materials Science and Engineering, College of Transportation Engineering, Dalian Maritime University Dalian 116026 PR China.
RSC Adv. 2025 Jul 2;15(28):22690-22698. doi: 10.1039/d5ra03230j. eCollection 2025 Jun 30.
Aqueous manganese-ion batteries (AMIBs) show promise for energy storage because Mn anodes exhibit high capacity (976 mAh g) and low potential (-1.18 V SHE). However, cathode development faces challenges due to solvated Mn with a large radius, resulting in slow ion diffusion, structural instability and limited capacity. Herein, we synthesized inorganic@organic VO@PEDOT nanocomposite a facile polymerization method by combining the EDOT monomer with VO. The resulting PEDOT coating exhibited strong adhesion to the VO substrate owing to the redox reaction at the organic-inorganic interface, creating a unique hybrid architecture with enhanced charge transfer properties. Furthermore, the PEDOT composite significantly enhanced electrochemical performance by simultaneously suppressing vanadium dissolution and improving electronic conductivity, resulting in exceptionally high specific capacity (340.3 mAh g at 0.5 A g) and rate capability (211.8 mAh g at 5 A g). Systematic mechanism characterization confirmed the structural stability and high reversibility of Mn insertion/extraction. The practical applicability of the nanocomposite was further demonstrated in a full-cell configuration (Mn‖VO@PEDOT), demonstrating high capacity. This study presents a high-performance cathode material for advanced AMIBs and provides new insights into design principles.
水系锰离子电池（AMIBs）在储能方面展现出潜力，因为锰阳极具有高容量（976 mAh g）和低电位（-1.18 V 标准氢电极）。然而，由于半径较大的溶剂化锰，阴极开发面临挑战，导致离子扩散缓慢、结构不稳定和容量有限。在此，我们通过将3,4-乙撑二氧噻吩（EDOT）单体与V₂O₅结合，采用简便的聚合方法合成了无机@有机V₂O₅@PEDOT纳米复合材料。由于有机-无机界面的氧化还原反应，所得的PEDOT涂层与V₂O₅基底表现出强附着力，形成了具有增强电荷转移性能的独特混合结构。此外，PEDOT复合材料通过同时抑制钒溶解和提高电子导电性，显著增强了电化学性能，从而产生了极高的比容量（在0.5 A g时为340.3 mAh g）和倍率性能（在5 A g时为211.8 mAh g）。系统的机理表征证实了锰插入/脱出的结构稳定性和高可逆性。该纳米复合材料在全电池配置（Mn‖V₂O₅@PEDOT）中的实际适用性进一步得到证明，显示出高容量。本研究提出了一种用于先进水系锰离子电池的高性能阴极材料，并为设计原则提供了新的见解。
