Volume 62, Issue 45 e202308182
Research Article

Porous Cyclodextrin Polymer Enables Dendrite-Free and Ultra-Long Life Solid-State Zn-I2 Batteries

Yang Su

Yang Su

Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China

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Xinlu Wang

Xinlu Wang

Department of Chemistry & Environmental Engineering, Changchun University of Science and Technology, Changchun, Jilin, 130022 P. R. China

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Minghang Zhang

Minghang Zhang

Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China

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Huimin Guo

Huimin Guo

Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China

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Prof. Haizhu Sun

Prof. Haizhu Sun

Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China

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Gang Huang

Gang Huang

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 P. R. China

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Prof. Dongtao Liu

Corresponding Author

Prof. Dongtao Liu

Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China

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Prof. Guangshan Zhu

Corresponding Author

Prof. Guangshan Zhu

Department of Chemistry, Northeast Normal University, Changchun, Jilin, 130024 P. R. China

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First published: 26 September 2023
Citations: 23

Graphical Abstract

A solid polymer electrolyte based on non-covalent anchoring effect of CD-Si and double transmission channels is exploited to suppress Zn dendrites growth and shuttle effect of polyiodide, achieving outstanding cycle-stability of symmetrical batteries and ultralong-life solid-state Zn-I2 battery.

Abstract

Zn-I2 batteries have attracted attention due to their low cost, safety, and environmental friendliness. However, their performance is still limited by the irreversible growth of Zn dendrites, hydrogen evolution reactions, corrosion, and shuttle effect of polyiodide. In this work, we have prepared a new porous polymer (CD-Si) by nucleophilic reaction of β-cyclodextrin with SiCl4, and CD-Si is applied to the solid polymer electrolyte (denoted PEO/PVDF/CD-Si) to solve above-mentioned problems. Through the anchoring of the CD-Si, a conductive network with dual transmission channels was successfully constructed. Due to the non-covalent anchoring effect, the ionic conductivity of the solid polymer electrolytes (SPE) can reach 1.64×10−3 S cm−1 at 25 °C. The assembled symmetrical batteries can achieve highly reversible dendrite-free galvanizing/stripping (stable cycling for 7500 h at 5 mA cm−2 and 1200 h at 20 mA cm−2). The solid-state Zn-I2 battery shows an ultra-long life of over 35,000 cycles at 2 A g−1. Molecular dynamics simulations are performed to elucidate the working mechanism of CD-Si in the polymer matrix. This work provides a novel strategy towards solid electrolytes for Zn-I2 batteries.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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