Polyiodide Confinement by Starch Enables Shuttle-Free Zn-Iodine Batteries
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(Published version)
Date
2022
Authors
Zhang, S.-J.
Hao, J.
Li, H.
Zhang, P.-F.
Yin, Z.-W.
Li, Y.-Y.
Zhang, B.
Lin, Z.
Qiao, S.-Z.
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Journal Title
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Journal article
Citation
Advanced Materials, 2022; 34(23)
Statement of Responsibility
Shao-Jian Zhang, Junnan Hao, Huan Li, Peng-Fang Zhang, Zu-Wei Yin, Yu-Yang Li, Bingkai Zhang, Zhan Lin, and Shi-Zhang Qiao
Conference Name
Abstract
Aqueous Zn–iodine (Zn–I2) batteries have been regarded as a promising energy-storage system owing to their high energy/power density, safety, and cost-effectiveness. However, the polyiodide shuttling results in serious active mass loss and Zn corrosion, which limits the cycling life of Zn–I2 batteries. Inspired by the chromogenic reaction between starch and iodine, a structure confinement strategy is proposed to suppress polyiodide shuttling in Zn–I2batteries by hiring starch, due to its unique double-helix structure. In situ Raman spectroscopy demonstrates an I5−-dominated I−/I2 conversion mechanism when using starch. The I5− presents a much stronger bonding with starch than I3−, inhibiting the polyiodide shuttling in Zn–I2 batteries, which is confirmed by in situ ultraviolet–visible spectra. Consequently, a highly reversible Zn–I2 battery with high Coulombic efficiency (≈100% at 0.2 A g−1) and ultralong cycling stability (>50 000 cycles) is realized. Simultaneously, the Zn corrosion triggered by polyiodide is effectively inhibited owing to the desirable shuttling-suppression by the starch, as evidenced by X-ray photoelectron spectroscopy analysis. This work provides a new understanding of the failure mechanism of Zn–I2 batteries and proposes a cheap but effective strategy to realize high-cyclability Zn–I2 batteries.
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First published: 18 April 2022.
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© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and re-production in any medium, provided the original work is properly cited.