ScholarWorks@성균관대학교

초록

Aqueous zinc metal batteries (ZMBs) possess high natural abundance and inherent safety. Nevertheless, their performance is hindered by inevitable water-induced hydrogen evolution reaction (HER). This side reaction causes irreversible zinc (Zn) consumption, corrosion, and dendrite formation. Herein, an element-based multi-component design concept is proposed for surface coating agent selection. A bismuth−iodide perovskite DFPD3BiI6 (4,4-difluoropiperidine, DFPD), comprising organic moieties, a metal center, and a halogen element, is selected. Spontaneous chemical reaction between DFPD3BiI6 and Zn metal (denoted as DFPD3BiI6@Zn) forms a protective layer with scalability up to 300 cm2. The hybrid layer comprises Bi, BiI3, ZnF2, Zn3N2 inorganic species, and C/N-rich organic components, resulting from the mixed organic−inorganic nature of DFPD3BiI6. Notably, the Bi and Bi−I-based constituents show excellent HER suppression capability, while the ZnF2 and Zn3N2 components improve Zn2+ transport kinetics and serve as an electronically insulating layer. Metallic Zn is uniformly deposited beneath the multi-component interface layer, resulting in a smooth and dendrite-free surface. Consequently, the DFPD3BiI6@Zn symmetrical cell shows an ultralong lifespan over 5000 h at 1 mA cm−2 and 1 mAh cm−2. The fabrication of Ah-level pouch cells validates the practicality of the multi-component interface strategy, which is of great significance in advancing the development of ZMBs.

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