Conductive 2D metal-organic framework for high-performance cathodes in aqueous rechargeable zinc batteries

摘要

Currently, there is considerable interest in developing advanced rechargeable batteries that boast efficient distribution of electricity and economic feasibility for use in large-scale energy storage systems. Rechargeable aqueous zinc batteries are promising alternatives to lithium-ion batteries in terms of rate performance, cost, and safety. In this investigation, we employ Cusub3/sub(HHTP)sub2/sub, a two-dimensional (2D) conductive metal-organic framework (MOF)?with large one-dimensional channels, as a zinc battery cathode. Owing to its unique structure, hydrated Znsup2+/sup ions which are inserted directly into the host structure, Cusub3/sub(HHTP)sub2/sub, allow high diffusion rate and low interfacial resistance which enable the Cusub3/sub(HHTP)sub2/sub cathode to follow the intercalation pseudocapacitance mechanism. Cusub3/sub(HHTP)sub2/sub exhibits a high reversible capacity of 228?mAh?gsup-1/sup at 50?mA?gsup-1/sup. At a high current density of 4000?mA?gsup-1/sup (~18?C), 75.0% of the initial capacity is maintained after 500 cycles. These results provide key insights into high-performance, 2D conductive MOF designs for battery electrodes.