Aqueous zinc ion batteries (AZIBs) have been regarded as one of the most promising energy storage systems because of their security, high specific capacity and abundant zinc resources, etc. Despite the promising prospects of AZIBs, their practical application is still plagued by dendrite and side reactions on zinc surface. In this paper, glass fiber separators were modified by in-situ loading metal-organic framework MIL-125 (M-125) and its -NH2-functionalized material (NM-125). The designed separator pore structure was successfully adjusted and endowed with -NH2 functional groups, which can ultimately dramatically enhance the electrochemical performance of AZIBs under practical operation conditions. The functionalized NM-125 with smaller pore size and particle size enables NM-125-GF to prevent the transport of macromolecular anions in the electrolyte, guiding and promoting zinc ions to undergo an orderly migration. In addition, -NH2 of NM-125 can adsorb Zn2+ and detach them from the solvated structure, inhibiting the generation of anode-side reactions and optimizing battery performance. Notably, Zn||MnO2 full cell assembled with -NH2 functionalized separator also shows a high initial discharge specific capacity (160.2 mAh g-1) with a high capacity retention of ∼99.8% even after 700 cycles. The rational design of the functionalized separator provides a useful guideline for optimizing high-performance AZIBs.

中文翻译：

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通过具有特殊官能团的微孔金属有机框架实现稳定锌负极的隔膜功能化


水系锌离子电池 （AZIBs） 因其安全性、高比容量和丰富的锌资源等优点而被认为是最有前途的储能系统之一。尽管 AZIBs 前景广阔，但其实际应用仍受到锌表面枝晶和副反应的困扰。在本文中，通过原位负载金属有机框架 MIL-125 （M-125） 及其 -NH2 功能化材料 （NM-125） 对玻璃纤维隔膜进行了改性。成功调整了所设计的隔膜孔结构，并赋予了 -NH2 官能团，最终可以显着提高 AZIBs 在实际操作条件下的电化学性能。功能化的 NM-125 具有较小的孔径和粒径，使 NM-125-GF 能够阻止大分子阴离子在电解质中的运输，引导和促进锌离子进行有序迁移。此外，NM-125 的 -NH2 可以吸附 Zn2+ 并将其从溶剂化结构中分离出来，抑制阳极反应的产生并优化电池性能。值得注意的是，Zn||使用 -NH2 功能化隔膜组装的 MnO2 全电池也显示出较高的初始放电比容量 （160.2 mAh g-1），即使在 700 次循环后也能保持 ∼99.8% 的高容量保持率。功能化隔膜的合理设计为优化高性能 AZIB 提供了有用的指南。