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Solar Trap-Adsorption Photocathode for Highly Stable 2.4 V Dual-Ion Solid-State Iodine Batteries
Xueying Zhang1, Lingfeng Zhu2, Jiale Cao1
1Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin, 541004, China.
None:
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||I2 battery leveraging a Co3O4-TiO2 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||I2 battery delivers a high specific capacity of 1.36 mAh cm-2, 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-2. 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.
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