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Strong Donor–Acceptor Effect Enables Efficient Polyiodides Confinement and Fast Redox Kinetics Toward Zinc–Iodine Batteries
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DOI：10.1002/anie.6120547.png)
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Abstract
En 中文
Aqueous zinc–iodine batteries (ZIBs) based on iodine (I2) redox conversion suffer from severe polyiodides shuttling and sluggish redox kinetics, leading to poor cycling stability. Herein, we propose a donor–acceptor (D–A) synergetic interaction strategy to enable high-performance ZIBs by employing thiophene-rich covalent triazine frameworks (SCTF-DCT) as an advanced I2 host catalyst. The strong D–A cooperative effect combined with a rich micro-mesoporous structure not only optimizes the polyiodides adsorption but also enhances the conversion kinetics of I2 species. Benefiting from the strong D–A effect, the as-assembled ZIBs with I2 loaded SCTF-DCT (I2@SCTF-DCT) cathode demonstrate exceptional cycling life, exceeding 100,000 cycles with a minimal decay rate of only 0.000198% per cycle. In/ex situ characterizations and theoretical calculations reveal the reversible redox mechanism of I2 species and highlight the significance of the D–A collaborative effect. This work elucidates the mechanisms of adsorption and catalytic conversion of I2 species via a D–A synergetic interaction strategy, providing a promising approach for designing advanced host catalysts for next-generation ZIBs and other energy storage systems.
Keywords:
covalent triazine frameworks
donor–acceptor effect
excellent polyiodides confinement
Thiophene units
zinc–iodine batteries
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