Electrochemically Induced Metal-Organic-Framework-Derived Amorphous V2O5for Superior Rate Aqueous Zinc-Ion Batteries

The electrochemical performance of vanadium-oxide-based cathodes in aqueous zinc-ion batteries (ZIBs) depends on their degree of crystallinity and composite state with carbon materials. An in situ electrochemical induction strategy was developed to fabricate a metal-organic-framework-derived composite of amorphous V(2)O(5)and carbon materials (a-V2O5@C) for the first time, where V(2)O(5)is in an amorphous state and uniformly distributed in the carbon framework. The amorphous structure endows V(2)O(5)with more isotropic Zn(2+)diffusion routes and active sites, resulting in fast Zn(2+)transport and high specific capacity. The porous carbon framework provides a continuous electron transport pathway and ion diffusion channels. As a result, the a-V2O5@C composites display extraordinary electrochemical performance. This work will pave the way toward design of ZIB cathodes with superior rate performance.