Zn/Co bimetallic metal-organic framework derived carbon anode with enchanted rate capability for lithium-ion capacitors

Lithium-ion capacitors (LICs) combine the advantages of lithium-ion batteries and supercapacitors, demonstrating great application prospects in the fields of large-scale renewable energy, and have been attracting increasing attention. Regrettably, the power capability of LICs is significantly hindered by the incongruent kinetics between battery-type anodes and capacitive cathodes. To address this challenge, in this study, a carbon anode derived from Zn/Co bimetallic metal-organic framework (MOF), specifically the Zn 80 Co 20 -PC, is synthesized through a direct carbonization process. Benefitting from the optimal degree of graphitization, substantial specific surface area, and comprehensive porous structure, the incongruent behaviour is effectively alleviated. As a result, the battery assembled with Zn 80 Co 20 -PC yielded an impressive capacity of 397.1 mAh g −1 at a current density of 0.1 A g −1 and a commendable rate capability of 109.6 mAh g −1 at 1.6 A g −1 . Moreover, the LICs crafted with a pre-lithiated Zn 80 Co 20 -PC anode and an activated carbon (AC) cathode (designated as Zn 80 Co 20 -PC//AC LICs) exhibit a notable energy density of 123 Wh kg −1 and an elevated power density of 7150.3 W kg −1 , maintaining exceptional durability through 5000 cycles. This study introduces innovative strategies for integrating advanced anode materials into lithium-ion capacitors.