All-Climate Energy-Dense Cascade Aqueous Zn-I2 Batteries Enabled by a Polycationic Hydrogel Electrolyte
© 2025 Wiley‐VCH GmbH.
| Publié dans: | Advanced materials (Deerfield Beach, Fla.). - 1998. - (2025) vom: 16. Feb., Seite e2415979 |
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| Auteur principal: | |
| Autres auteurs: | , , , , , , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2025
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| Accès à la collection: | Advanced materials (Deerfield Beach, Fla.) |
| Sujets: | Journal Article aqueous zinc‐iodine batteries cascade reactions high energy polycationic hydrogel electrolyte wide temperature range |
| Résumé: | © 2025 Wiley‐VCH GmbH. The practical development of aqueous zinc-iodine (Zn-I2) batteries is greatly hindered by the low energy density resulting from conventional I0/I- conversion and the limited temperature tolerance. Here, a temperature-insensitive polycationic hydrogel electrolyte borax-bacterial cellulose / p(AM-co-VBIMBr) (denoted as BAVBr) for achieving an energy-dense cascade aqueous Zn-I2 battery over a wide temperature range from -50 to 50 °C is designed. A comprehensive investigation, combining advanced spectroscopic investigation and DFT calculations, has revealed that the presence of Br species in the gel electrolyte facilitates the conversion reaction of Br0/Br-. Simultaneously, it activates the high voltage I+/I0 redox reaction through interhalogen formation. Consequently, sequential and highly reversible redox reactions involving I0/I-, I+/I0, and Br0/Br- are achieved with the assistance of -NR3 + units in BAVBr, effectively suppressing interhalogen hydrolysis in aqueous electrolyte. The cascade reactions lead to a high area capacity of 0.76 mAh cm-2 at a low I2 loading of 1 mg cm-2 or 760 mAh g-1 based on the mass of iodine, demonstrating exceptional long-term cycling stability over a wide temperature range from -50 to 50 °C. This study offers valuable insights into the rational design of electrolytes for high-energy aqueous batteries, specifically tailored for wide-temperature operation |
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| Description: | Date Revised 16.02.2025 published: Print-Electronic Citation Status Publisher |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202415979 |