Artificial Solid Electrolyte Interphases with Confined Ion Channels and Zincophilic Sites for High-Performance Zn Metal Anodes

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In the quest to overcome the obstacles encountered by zinc anodes and side reactions in aqueous zinc-ion batteries (AZIBs), researchers have presented a variety of innovative strategies. This research focuses on an approach by engineering angstrom pores (4.32 Å–8.57 Å), to serve as ion channels that selectively restrict the transport of [Zn(H 2 O) 6 ] 2+ ions based on size exclusion principles. Moreover, the utilization of nitrogen-enriched MET-6 as zincophilic sites enhances the adsorption of Zn 2+ ions, thereby facilitating their desolvation process. Through rigorous experimental analysis and corroborated by computational simulations, it was demonstrated that the MET-6@Zn composite, serving as an artificial solid electrolyte interphase, can effectively suppress side reactions and ensure the maintenance of homogeneous electric fields and ion fluxes, which directed the uniform deposition of Zn 2+ ions and realized high-performance Zn metal anodes. Notably, symmetric cells integrated with MET-6@Zn electrodes exhibited remarkable stability with continuous cycling for up to 3200 h at a current density of 0.5 mA cm –2 . In addition, full cells equipped with KVOH cathodes maintained an impressive capacity retention rate, retaining up to 82% of their initial capacity after 1250 cycles at a current density of 8 A g –1, marking a substantial enhancement in comparison to the performance of bare zinc electrodes. The integration of confined ion channels and zincophilic sites presents a promising strategy for stabilizing zinc anodes, providing innovative solutions to persistent challenges in AZIB technology.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.