Polyiodide Confinement by Starch Enables Shuttle-Free Zn-Iodine Batteries

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dc.contributor.authorZhang, S.-J.
dc.contributor.authorHao, J.
dc.contributor.authorLi, H.
dc.contributor.authorZhang, P.-F.
dc.contributor.authorYin, Z.-W.
dc.contributor.authorLi, Y.-Y.
dc.contributor.authorZhang, B.
dc.contributor.authorLin, Z.
dc.contributor.authorQiao, S.-Z.
dc.date.issued2022
dc.descriptionFirst published: 18 April 2022.
dc.description.abstractAqueous 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.
dc.description.statementofresponsibilityShao-Jian Zhang, Junnan Hao, Huan Li, Peng-Fang Zhang, Zu-Wei Yin, Yu-Yang Li, Bingkai Zhang, Zhan Lin, and Shi-Zhang Qiao
dc.identifier.citationAdvanced Materials, 2022; 34(23)
dc.identifier.doi10.1002/adma.202201716
dc.identifier.issn0935-9648
dc.identifier.issn1521-4095
dc.identifier.orcidZhang, S.-J. [0000-0001-7738-0425]
dc.identifier.orcidHao, J. [0000-0002-5777-7844]
dc.identifier.orcidLi, H. [0000-0003-0662-6939]
dc.identifier.orcidQiao, S.-Z. [0000-0002-1220-1761] [0000-0002-4568-8422]
dc.identifier.urihttps://hdl.handle.net/2440/135126
dc.language.isoen
dc.publisherWiley
dc.relation.granthttp://purl.org/au-research/grants/arc/FL170100154
dc.relation.granthttp://purl.org/au-research/grants/arc/DP220102596
dc.rights© 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.
dc.source.urihttps://doi.org/10.1002/adma.202201716
dc.subjectZn corrosion
dc.subjectZn-iodine batteries
dc.subjectshuttle effect
dc.subjectstarch
dc.subjectstructure confinement
dc.titlePolyiodide Confinement by Starch Enables Shuttle-Free Zn-Iodine Batteries
dc.typeJournal article
pubs.publication-statusPublished

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