Li Shilin, Zhou Taoyun, Liu Muzhou, Zhao Qiaomei, Liu Yi, Cheng Yun, Li Xinyu
School of Information, Hunan University of Humanities, Science and Technology, Loudi 417099, China.
Key Laboratory of Low-Dimensional Structural Physics and Application, Education Department of Guangxi Zhuang Autonomous Region, College of Physics and Electronic Information Engineering, Guilin University of Technology, Guilin 541004, China.
Micromachines (Basel). 2025 Apr 29;16(5):536. doi: 10.3390/mi16050536.
The development of safe, cost-effective, and environmentally friendly energy storage systems has spurred growing interest in aqueous ZIBs. However, the poor cycling stability of cathode materials-mainly due to manganese dissolution and structural degradation-remains a major bottleneck. In this work, a porous MnO/PPy hybrid nanocomposite is successfully synthesized via an in situ co-precipitation strategy. The conductive PPy buffer layer not only alleviates Mn dissolution and buffers volume expansion during cycling but also enhances ion/electron transport and facilitates electrolyte infiltration due to its high surface area. Electrochemical evaluation reveals that the MnO/PPy electrode delivers excellent cycling stability, retaining 75% of its initial capacity after 1000 cycles at a current density of 1 A·g. Comparative performance analysis shows that MnO/PPy exhibits superior capacity retention and rate capability, especially under high current densities and prolonged cycling. These results underscore the effectiveness of the PPy interfacial layer in improving structural integrity and electrochemical performance, offering a promising route for designing high-performance cathode materials for aqueous ZIBs.
安全、经济高效且环境友好的储能系统的发展激发了人们对水系锌离子电池（ZIBs）日益增长的兴趣。然而，正极材料较差的循环稳定性——主要归因于锰的溶解和结构退化——仍然是一个主要瓶颈。在这项工作中，通过原位共沉淀策略成功合成了一种多孔MnO/PPy杂化纳米复合材料。导电的PPy缓冲层不仅减轻了锰的溶解并缓冲了循环过程中的体积膨胀，而且由于其高表面积增强了离子/电子传输并促进了电解质渗透。电化学评估表明，MnO/PPy电极具有出色的循环稳定性，在1 A·g的电流密度下循环1000次后仍保留其初始容量的75%。对比性能分析表明，MnO/PPy表现出优异的容量保持率和倍率性能，尤其是在高电流密度和长时间循环下。这些结果强调了PPy界面层在改善结构完整性和电化学性能方面的有效性，为设计用于水系ZIBs的高性能正极材料提供了一条有前景的途径。
