香港城市大学张其春团队报道了调节有机正极材料分子间氢键制备超稳定、柔性、低温有机锌水电池。相关研究成果发表在2024年10月9日出版的国际学术期刊《德国应用化学》。

合理设计分子结构是获得高性能有机阴极材料的有效策略之一。然而，除了优化单分子结构外，还应充分考虑有机阴极材料中“弱”相互作用力（如氢键）对电池性能的影响。

该文选择了三种不同羟基数的有机小分子（即氮杂环四酮（DAB）、单羟基氮杂环二酮（HDA）、二羟基氮杂环二酮（DHT））作为水性锌离子电池（AZIBs）的阴极，并首次研究了分子间氢键对其电化学性能的影响。

显然，通过羟基构建的稳定氢键网络显著增强了有机小分子阴极的循环稳定性，并通过Grotthuss机制促进氢键网络之间的快速质子传导，从而赋予它们优异的速率性能。此外，通过多个羟基可以构建更大、更密集的二维氢键网络，进一步增强有机小分子阴极的结构稳定性，使其具有更好的循环耐受性、优异的速率性能和极端的环境耐受性。

附：英文原文

Title: Regulating Intermolecular Hydrogen Bonds in Organic Cathode Materials to Realize Ultra-stable, Flexible and Low-temperature Aqueous Zinc-organic Batteries

Author: Chaojian Ding, Yuxuan Zhao, Weifeng Yin, Fangyuan Kang, Weiwei Huang, Qichun Zhang

Issue&Volume: 2024-10-09

Abstract: Rational design of molecular structures is one of the effective strategies to obtain high-performance organic cathode materials. However, besides the optimization of single-molecule structures, the influence of the "weak" interaction forces (e.g. hydrogen bonds) in organic cathode materials on the performance of batteries should be fully considered. Herein, three organic small molecules with different numbers of hydroxyl groups (namely nitrogen heterocyclic tetraketone (DAB), monohydroxyl nitrogen heterocyclic dione (HDA), dihydroxyl nitrogen heterocyclic dione (DHT)) were selected as the cathodes of aqueous zinc ion batteries (AZIBs), and the effect of the intermolecular hydrogen bonds on their electrochemical performance was studied for the first time. Clearly, the stable hydrogen-bond networks built through the hydroxyl groups significantly enhance the cycle stability of organic small-molecule cathodes and facilitate rapid proton conduction between the hydrogen-bond networks through the Grotthuss mechanism, thereby endowing them with excellent rate performance. In addition, a larger and more dense two-dimensional hydrogen-bond network can be constructed through multiple hydroxyl groups, further enhancing the structural stability of organic small-molecule cathodes, giving them better cycle tolerance, excellent rate performance, and extreme environmental tolerance.

DOI: 10.1002/anie.202417988

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202417988