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Shuttle Suppression in Zinc-Iodine Batteries via a Gd/Eu Co-Doped Cerium Oxide Modified Separator
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DOI：10.1002/chem.202503632.png)
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Abstract
En 中文
Zn-I2 batteries have emerged as a compelling electrochemical energy storage platform, benefiting from their excellent theoretical capacity, inherent safety, and low cost. Nevertheless, their development, especially on the separator, is impeded by the severe shuttle of polyiodides and sluggish reaction kinetics. To address these challenges, this work demonstrates the design of Gadolinium (Gd) and Europium (Eu) co-doped cerium oxide (CeO2) nanoparticles as a functional separator coating, utilizing experimental techniques paired with density functional theory (DFT) calculations to evaluate performance. The results reveal that Gd/Eu co-doping modulates the electronic structure of CeO2, providing abundant active sites that strongly chemisorb polyiodides and act as excellent electrocatalysts to accelerate the reversible conversion between I3 - and I-. Consequently, the batteries employing the Ce0.96Gd0.02Eu0.02O2 coating effectively suppress the polyiodide shuttle, exhibiting outstanding high-rate performance with a capacity of 193 mAh g-1 at 10 A g-1 and maintaining stable cycling for 50,000 cycles. This study provides a potential pathway for fabricating high-performance Zn-I2 batteries by integrating adsorption and catalytic conversion functions into a single separator modification.
Keywords:
adsorption
doping
triiodide
zinc iodine battery
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3.7
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3.9W
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9.6W
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