Temperature-Adaptive Aqueous Zinc-Iodine Batteries Enabled by Ionic Covalent Organic Framework Modified Separator.

Authors

Yuyang Wang, Yiming Qi, Guoyu Bi, Weiliang Yin, Wei Zhang

Published in

The journal of physical chemistry letters. Pages 5515-5522. May 27, 2025. Epub May 27, 2025.

Abstract

Zinc-iodine batteries (ZIBs) face challenges, such as polyiodide shuttling, self-discharge, and temperature sensitivity. To overcome these issues, we developed a separator functionalized with an ionic covalent organic framework (COF@GF), which incorporates pyridine quaternary ammonium active sites. The COF@GF separator enhances ionic conductivity (13.9 mS cm^-1) and Zn²⁺ transference number (0.76), suppresses anode dendrite formation, and reduces self-discharge. In situ Raman spectroscopy and theoretical calculations show that COF's moderate electronic conductivity improves I₃^-/I₅^- conversion kinetics and enhances polyiodide adsorption through Lewis acid-base interactions, thus controlling redox chemistry and suppressing shuttle effects. COF@GF-modified ZIBs exhibit stable cycling for over 5000 cycles at 20 C and perform well across temperatures from -5 to 60 °C. At 0 °C, the battery retains 89.6% of its capacity over 10000 cycles, with a minimal decay rate of 0.001% per cycle, showcasing the potential of ionic COF materials for practical aqueous ZIB applications.

PMID:
40424486
Bibliographic data and abstract were imported from PubMed on 28 May 2025.

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