Strategic Nitrogen Site Alignment in Covalent Organic Frameworks for Enhanced Performance in Aqueous Zinc-Iodide Batteries

被引:1
作者
Yin, Liying [1 ,2 ]
Guo, Xiaoyu [1 ]
Hu, Junfang [1 ]
Yan, Kaimeng [1 ]
Liu, Lin [1 ]
Shi, Xiaoyuan [1 ]
Cui, Fengchao [1 ]
Zhu, Guangshan [1 ]
Zhang, Ning [1 ]
机构
[1] Northeast Normal Univ, Fac Chem, Minist Educ, Key Lab Polyoxometalate & Reticular Mat Chem, Changchun 130024, Peoples R China
[2] Changchun Univ Technol, Fac Chem & Life Sci, Changchun 130012, Peoples R China
基金
国家重点研发计划;
关键词
covalent organic frameworks; multi-active nitrogen sites; polyiodide confinement; efficient mass transport; aqueous Zn-I-2 batteries; ENERGY-STORAGE; LI;
D O I
10.1002/anie.202423265
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Aqueous zinc-iodine batteries (AZIBs) are gaining attention as next-generation energy storage systems due to their high theoretical capacity, enhanced safety, and cost-effectiveness. However, their practical application is hindered by challenges such as slow reaction kinetics and the persistent polyiodide shuttle effect. To address these limitations, we developed a novel class of covalent organic frameworks (COFs) featuring electron-rich nitrogen sites with varied density and distribution (N-1-N-4) along the pore walls. These nitrogen sites enhance iodine species confinement and mass transport. Our experimental and theoretical studies reveal that the continuous and optimized distribution of nitrogen sites within the COF structure significantly reduces internal resistance and boosts redox activity. Moreover, the N-4-COF demonstrates superior performance compared to other porous materials, due to its high density and strategic alignment of active sites. The I-2@N-4-COF cathode achieves a remarkable specific capacity of 348 mAh g(-1) at 1 C, almost 1.8 times greater than that of the I-2@N-1-COF, while also maintaining excellent cycling stability. This integration of a porous framework with aligned nitrogen sites in the N-4-COF structure not only enhances iodine redox behavior but also offers a promising design strategy for developing high-performance AZIB electrodes.
引用
收藏
页数:9
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