Abstract
Zn-I2batteries 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 prepareda newporous polymer (CD-Si) by nucleophilic reactionofβ-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 × 10-3S cm-1at 25 ºC. The assembled symmetrical batteries can achieve highly reversible dendrite-free galvanizing/stripping (stable cycling for 7500 h at 5 mA cm-2and 1200 h at 20 mA cm-2). The solid-state Zn-I2battery shows anultra-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 providesa novel strategy towards solid electrolytes for Zn-I2batteries.
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