近日，澳大利亚阿德莱德大学乔世璋团队报道了电活性二茂铁/二茂铁氧化还原偶联用于无梭水性锌碘袋电池。相关论文于2025年11月6日发表在《自然-化学》杂志上。

水基锌碘电池具有较高的安全性和倍率性能，在电网储能领域具有广泛的应用前景。然而，传统的碘阴极寄主通常具有电化学活性，并且与多碘化物的相互作用较弱，这不仅影响了电池的能量密度，而且无法消除穿梭效应。

研究组报道了一种电活性氧化还原偶联策略，通过在阴极中加入二茂铁来提高锌碘电池的能量密度并抑制穿梭效应。二茂铁能够实现可逆的二茂铁/二茂铁氧化还原转化，与多碘化物偶联形成不溶性二茂铁-多碘化物配合物，从而抑制穿梭效应。

此外，该氧化还原反应使得正极在纽扣电池构型中实现160.5 mAh g^-1（以正极质量计）的整体放电容量，并在1C倍率下库仑效率超过99.5%。采用8.4 mAh cm^-2高面容量正极制作的1.2安时软包电池，在0.5C倍率下可稳定循环600次，平均库仑效率达99.8%。该发现为同时解决电池应用中的穿梭效应与电极本体能量密度衰减问题提供了新策略。

附：英文原文

Title: Electroactive ferrocene/ferrocenium redox coupling for shuttle-free aqueous zinc–iodine pouch cells

Author: Zhang, Shao-Jian, Hao, Junnan, Wu, Han, Hu, Yiyang, Chen, Qianru, Johannessen, Bernt, Ma, Qianyi, Luo, Dan, Qiao, Shi-Zhang

Issue&Volume: 2025-11-06

Abstract: Aqueous zinc–iodine batteries are attractive for grid-scale energy storage because of their high safety and rate capability. However, conventional hosts for iodine cathodes are often electrochemically inactive and show weak interaction with polyiodides, which not only compromises the battery energy density, but also fails to eliminate shuttle effects. Here we report an electroactive redox coupling strategy to enhance energy density and suppress shuttle effects of zinc–iodine batteries by incorporating ferrocene in cathodes. The ferrocene enables a reversible ferrocene/ferrocenium redox conversion that couples with polyiodides to form insoluble ferrocenium–polyiodide complexes, thereby suppressing shuttle effects. Moreover, this redox elevates the overall discharge capacity of cathodes to 160.5mAhgcathode1 and Coulombic efficiency to over 99.5% at 1C in coin-cell configurations. A 1.2 ampere-hour pouch cell with high-area-capacity cathodes of 8.4mAhcm2 sustains 600 stable cycles at 0.5C with an average Coulombic efficiency of 99.8%. This finding provides a strategy to address both shuttle effects and host-derived energy density loss for battery applications.

DOI: 10.1038/s41557-025-01986-7

Source: https://www.nature.com/articles/s41557-025-01986-7