北京理工大学陈人杰团队报道了高性能水相锌离子电池中芳香族聚合物半包裹MnO₂的界面设计。相关研究成果于2022年10月14日发表在《德国应用化学》。

氧化锰（MnO₂）由于其优良的比容量和高的工作电压，已成为水性锌离子电池（AZIBs）的研究热点。然而，不可逆的结构崩溃和缓慢的离子扩散导致速率能力差和寿命差。

该文中，研究人员提出了一种碳基聚（4,4'-氧基双苯胺）/MnO₂（表示为C@PODA/MnO2）。各种原位/非原位分析和理论计算证明，具有C=N基团的PODA链可以为混合阴极中的离子/电子迁移率和锌离子存储提供更活跃的表面/界面。更重要的是，新形成的Mn-N界面键可以有效促进离子扩散，防止Mn原子溶解，增强MnO₂的氧化还原动力学和结构完整性，C@PODA/MnO₂阴极具有高容量（在0.1 A g^-1下为321 mAh g^-1或1.7 mAh cm^-2）、优异的倍率性能（在10 A g^-1时为88 mAh g^-1）和超过2000次循环的优异循环稳定性。因此，合理的界面设计为先进AZIBs的有机/无机阴极的开发提供了依据。

附：英文原文

Title: Interfacial Designing of MnO2 Half-Wrapped by Aromatic Polymers for High-Performance Aqueous Zinc-Ion Batteries

Author: Yi Zhao, Rongkun Zhou, Zhihang Song, Xiaodong Zhang, Tao Zhang, Anbin Zhou, Feng Wu, Renjie Chen, Li Li

Issue&Volume: 2022-10-14

Abstract: Due to the excellent specific capacity and high working voltage, manganese oxide (MnO  2  ) has attracted considerable attention for aqueous zinc-ion batteries (AZIBs). However, the irreversible structural collapse and sluggish ionic diffusion lead to poor rate capability and inferior lifespan. Herein, we proposed a novel organic/inorganic hybrid cathode of carbon-based poly(4,4'-oxybisbenzenamine)/MnO  2  (denoted as C@PODA/MnO  2  ) for AZIBs. Various in/ex-situ analyses and theoretical calculations prove that PODA chains with C=N groups can provide a more active surface/interface for ion/electron mobility and zinc ion storage in the hybrid cathode. More importantly, newly formed Mn-N interfacial bonds can effectively promote ion diffusion and prevent Mn atoms dissolution, enhancing redox kinetics and structural integrity of MnO  2  . Accordingly, C@PODA/MnO  2  cathode exhibits high capacity (321 mAh g  1  or 1.7 mAh cm  2  at 0.1 A g  1  ), superior rate performance (88 mAh g  1  at 10 A g  1  ) and excellent cycling stability over 2000 cycles. Hence, rational interfacial designs shed light on the development of organic/inorganic cathodes for advanced AZIBs.

DOI: 10.1002/anie.202212231

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202212231