Zhang Xueying, Zhu Lingfeng, Cao Jiale, Li Zheng, Wang Youliang, Zhao Jianwei, Xie Zhencheng, Li Xiaoning, Ma Tianyi, Liu Bo-Tian
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin, 541004, China.
Centre for Atomaterials and Nanomanufacturing (CAN), School of Science, RMIT University, Melbourne, VIC, 3000, Australia.
Adv Mater. 2025 Aug 6:e04492. doi: 10.1002/adma.202504492.
Rechargeable aqueous iodine-based electrochemical energy storage systems offer a cost-effective alternative to conventional alkali metal batteries for grid-scale applications. However, their practical deployment is hindered by sluggish iodine redox kinetics and the shuttle of polyiodides, which severely limit their lifespan. To address these challenges, a novel solid-state organic||I battery leveraging a CoO-TiO heterojunction photocathode is developed. By integrating a photo-assisted mechanism with an innovative device architecture, the system achieves accelerated iodine conversion kinetics, enhances iodide ion utilization, and enables a four-electron redox pathway. Theoretical calculation combined with electrochemical analysis reveals that the photo-assisted mechanism promotes electrostatic adsorption of polyiodides, accelerates interfacial charge transfer, and significantly improves iodine redox kinetics. As a result, the organic||I battery delivers a high specific capacity of 1.36 mAh cm, a discharge voltage of 2.4 V, and excellent cycle stability over 1000 cycles, retaining 80.9% of its capacity at a current density of 10 mA cm. This photo-enhanced battery exhibits strong competitiveness compared to previously reported iodine-based batteries. The remarkable performance of this photo-assisted prototype offers a sustainable and cost-effective solution for next-generation energy storage.
可充电水系碘基电化学储能系统为电网规模应用提供了一种比传统碱金属电池更具成本效益的替代方案。然而，其实际应用受到碘氧化还原动力学缓慢和多碘化物穿梭的阻碍，这严重限制了它们的寿命。为应对这些挑战，开发了一种利用CoO-TiO异质结光阴极的新型固态有机||碘电池。通过将光辅助机制与创新的器件结构相结合，该系统实现了加速的碘转化动力学，提高了碘离子利用率，并实现了四电子氧化还原途径。理论计算与电化学分析表明，光辅助机制促进了多碘化物的静电吸附，加速了界面电荷转移，并显著改善了碘氧化还原动力学。结果，有机||碘电池具有1.36 mAh cm的高比容量、2.4 V的放电电压以及超过1000次循环的优异循环稳定性，在10 mA cm的电流密度下保持其容量的80.9%。与先前报道的碘基电池相比，这种光增强电池具有很强的竞争力。这种光辅助原型的卓越性能为下一代储能提供了一种可持续且具有成本效益的解决方案。
